-
Notifications
You must be signed in to change notification settings - Fork 1.6k
/
HttpCachePolicy.xml
1524 lines (1356 loc) · 92.9 KB
/
HttpCachePolicy.xml
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<Type Name="HttpCachePolicy" FullName="System.Web.HttpCachePolicy">
<TypeSignature Language="C#" Value="public sealed class HttpCachePolicy" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi sealed beforefieldinit HttpCachePolicy extends System.Object" />
<TypeSignature Language="DocId" Value="T:System.Web.HttpCachePolicy" />
<TypeSignature Language="VB.NET" Value="Public NotInheritable Class HttpCachePolicy" />
<TypeSignature Language="C++ CLI" Value="public ref class HttpCachePolicy sealed" />
<TypeSignature Language="F#" Value="type HttpCachePolicy = class" />
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces />
<Docs>
<summary>Contains methods for setting cache-specific HTTP headers and for controlling the ASP.NET page output cache.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
For background information about HTTP headers and controlling caching, see RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1, available on the [World Wide Web Consortium (W3C) Web site](https://go.microsoft.com/fwlink/?linkid=37125).
]]></format>
</remarks>
</Docs>
<Members>
<Member MemberName="AddValidationCallback">
<MemberSignature Language="C#" Value="public void AddValidationCallback (System.Web.HttpCacheValidateHandler handler, object data);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void AddValidationCallback(class System.Web.HttpCacheValidateHandler handler, object data) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.AddValidationCallback(System.Web.HttpCacheValidateHandler,System.Object)" />
<MemberSignature Language="VB.NET" Value="Public Sub AddValidationCallback (handler As HttpCacheValidateHandler, data As Object)" />
<MemberSignature Language="C++ CLI" Value="public:
 void AddValidationCallback(System::Web::HttpCacheValidateHandler ^ handler, System::Object ^ data);" />
<MemberSignature Language="F#" Value="member this.AddValidationCallback : System.Web.HttpCacheValidateHandler * obj -> unit" Usage="httpCachePolicy.AddValidationCallback (handler, data)" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="handler" Type="System.Web.HttpCacheValidateHandler" />
<Parameter Name="data" Type="System.Object" />
</Parameters>
<Docs>
<param name="handler">The <see cref="T:System.Web.HttpCacheValidateHandler" /> value.</param>
<param name="data">The arbitrary user-supplied data that is passed back to the <see cref="M:System.Web.HttpCachePolicy.AddValidationCallback(System.Web.HttpCacheValidateHandler,System.Object)" /> delegate.</param>
<summary>Registers a validation callback for the current response.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.HttpCachePolicy.AddValidationCallback%2A> method provides a mechanism to check the response programmatically in the cache before the response is returned to the client by the output cache.
Before the response is served from the Web server cache, all registered handlers are queried to ensure resource validity. If any handler sets a flag indicating that the cached response is not valid, the entry is marked as not valid and expelled from the cache. In this case, as well as when any handler indicates that the cached response should be ignored for this request, the request is then handled as if it were a cache miss.
<xref:System.Web.HttpCachePolicy.AddValidationCallback%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how to add a delegate to validate a request based on query string values.
[!code-aspx-csharp[Cache Validation Callback#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Cache validation callback/CS/ValidationCallbackcs.aspx#1)]
[!code-aspx-vb[Cache Validation Callback#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Cache validation callback/VB/ValidationCallbackvb.aspx#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The specified <paramref name="handler" /> is <see langword="null" />.</exception>
</Docs>
</Member>
<Member MemberName="AppendCacheExtension">
<MemberSignature Language="C#" Value="public void AppendCacheExtension (string extension);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void AppendCacheExtension(string extension) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.AppendCacheExtension(System.String)" />
<MemberSignature Language="VB.NET" Value="Public Sub AppendCacheExtension (extension As String)" />
<MemberSignature Language="C++ CLI" Value="public:
 void AppendCacheExtension(System::String ^ extension);" />
<MemberSignature Language="F#" Value="member this.AppendCacheExtension : string -> unit" Usage="httpCachePolicy.AppendCacheExtension extension" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="extension" Type="System.String" />
</Parameters>
<Docs>
<param name="extension">The text to append to the <see langword="Cache-Control" /> header.</param>
<summary>Appends the specified text to the <see langword="Cache-Control" /> HTTP header.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If the browser does not recognize cache control directives or extensions, the browser must ignore the unrecognized terms. For more information, see RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1, available on the [World Wide Web Consortium (W3C) Web site](https://go.microsoft.com/fwlink/?linkid=37125).
<xref:System.Web.HttpCachePolicy.AppendCacheExtension%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates the use of a cache-control extension supported by Internet Explorer. The server is indicating to the browser that the content will not change for one hour (`pre-check=3600`) and instructs it to retrieve the content directly from the local cache. However, if the content is modified by the server and the page is requested by the user within a fifteen-minute (`post-check= 900`) to one-hour period, the browser displays the information found in the local cache but also performs a background check and optional fetch of the new content on the server.
[!code-csharp[Classic HttpCachePolicy.AppendCacheExtension Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.AppendCacheExtension Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.AppendCacheExtension Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.AppendCacheExtension Example/VB/source.vb#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="extension" /> is <see langword="null" />.</exception>
</Docs>
</Member>
<Member MemberName="GetCacheability">
<MemberSignature Language="C#" Value="public System.Web.HttpCacheability GetCacheability ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.Web.HttpCacheability GetCacheability() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetCacheability" />
<MemberSignature Language="VB.NET" Value="Public Function GetCacheability () As HttpCacheability" />
<MemberSignature Language="C++ CLI" Value="public:
 System::Web::HttpCacheability GetCacheability();" />
<MemberSignature Language="F#" Value="member this.GetCacheability : unit -> System.Web.HttpCacheability" Usage="httpCachePolicy.GetCacheability " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Web.HttpCacheability</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the cache-control directive.</summary>
<returns>The cache-control directive.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetCacheExtensions">
<MemberSignature Language="C#" Value="public string GetCacheExtensions ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance string GetCacheExtensions() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetCacheExtensions" />
<MemberSignature Language="VB.NET" Value="Public Function GetCacheExtensions () As String" />
<MemberSignature Language="C++ CLI" Value="public:
 System::String ^ GetCacheExtensions();" />
<MemberSignature Language="F#" Value="member this.GetCacheExtensions : unit -> string" Usage="httpCachePolicy.GetCacheExtensions " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.String</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the cache extensions.</summary>
<returns>The cache extensions.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetETag">
<MemberSignature Language="C#" Value="public string GetETag ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance string GetETag() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetETag" />
<MemberSignature Language="VB.NET" Value="Public Function GetETag () As String" />
<MemberSignature Language="C++ CLI" Value="public:
 System::String ^ GetETag();" />
<MemberSignature Language="F#" Value="member this.GetETag : unit -> string" Usage="httpCachePolicy.GetETag " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.String</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the ETag.</summary>
<returns>The ETag.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetETagFromFileDependencies">
<MemberSignature Language="C#" Value="public bool GetETagFromFileDependencies ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool GetETagFromFileDependencies() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetETagFromFileDependencies" />
<MemberSignature Language="VB.NET" Value="Public Function GetETagFromFileDependencies () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool GetETagFromFileDependencies();" />
<MemberSignature Language="F#" Value="member this.GetETagFromFileDependencies : unit -> bool" Usage="httpCachePolicy.GetETagFromFileDependencies " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the status indicating whether the <see langword="ETag" /> header has been set based on the timestamps of the file dependencies of the handler.</summary>
<returns>
<see langword="true" /> if the <see langword="ETag" /> header has been set based on the timestamps of the file dependencies of the handler; otherwise, <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetExpires">
<MemberSignature Language="C#" Value="public DateTime GetExpires ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.DateTime GetExpires() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetExpires" />
<MemberSignature Language="VB.NET" Value="Public Function GetExpires () As DateTime" />
<MemberSignature Language="C++ CLI" Value="public:
 DateTime GetExpires();" />
<MemberSignature Language="F#" Value="member this.GetExpires : unit -> DateTime" Usage="httpCachePolicy.GetExpires " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.DateTime</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the expire header.</summary>
<returns>The expire header.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetIgnoreRangeRequests">
<MemberSignature Language="C#" Value="public bool GetIgnoreRangeRequests ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool GetIgnoreRangeRequests() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetIgnoreRangeRequests" />
<MemberSignature Language="VB.NET" Value="Public Function GetIgnoreRangeRequests () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool GetIgnoreRangeRequests();" />
<MemberSignature Language="F#" Value="member this.GetIgnoreRangeRequests : unit -> bool" Usage="httpCachePolicy.GetIgnoreRangeRequests " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the status of ignore range requests.</summary>
<returns>
<see langword="true" /> if range requests are ignored; otherwise <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetLastModifiedFromFileDependencies">
<MemberSignature Language="C#" Value="public bool GetLastModifiedFromFileDependencies ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool GetLastModifiedFromFileDependencies() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetLastModifiedFromFileDependencies" />
<MemberSignature Language="VB.NET" Value="Public Function GetLastModifiedFromFileDependencies () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool GetLastModifiedFromFileDependencies();" />
<MemberSignature Language="F#" Value="member this.GetLastModifiedFromFileDependencies : unit -> bool" Usage="httpCachePolicy.GetLastModifiedFromFileDependencies " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the status of the Last-Modified header set to base on the timestamps of the file dependencies of the handler.</summary>
<returns>
<see langword="true" /> if the Last-Modified header is set to base on the timestamps of the file dependencies of the handler; otherwise, <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetMaxAge">
<MemberSignature Language="C#" Value="public TimeSpan GetMaxAge ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.TimeSpan GetMaxAge() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetMaxAge" />
<MemberSignature Language="VB.NET" Value="Public Function GetMaxAge () As TimeSpan" />
<MemberSignature Language="C++ CLI" Value="public:
 TimeSpan GetMaxAge();" />
<MemberSignature Language="F#" Value="member this.GetMaxAge : unit -> TimeSpan" Usage="httpCachePolicy.GetMaxAge " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.TimeSpan</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the cache-control max age.</summary>
<returns>The cache-control max age.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetNoServerCaching">
<MemberSignature Language="C#" Value="public bool GetNoServerCaching ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool GetNoServerCaching() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetNoServerCaching" />
<MemberSignature Language="VB.NET" Value="Public Function GetNoServerCaching () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool GetNoServerCaching();" />
<MemberSignature Language="F#" Value="member this.GetNoServerCaching : unit -> bool" Usage="httpCachePolicy.GetNoServerCaching " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the status of server caching for the current response.</summary>
<returns>
<see langword="true" /> if server caching is stopped for the current response; otherwise <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetNoStore">
<MemberSignature Language="C#" Value="public bool GetNoStore ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool GetNoStore() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetNoStore" />
<MemberSignature Language="VB.NET" Value="Public Function GetNoStore () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool GetNoStore();" />
<MemberSignature Language="F#" Value="member this.GetNoStore : unit -> bool" Usage="httpCachePolicy.GetNoStore " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the status of the store.</summary>
<returns>
<see langword="true" /> if no store is set; otherwise <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetNoTransforms">
<MemberSignature Language="C#" Value="public bool GetNoTransforms ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool GetNoTransforms() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetNoTransforms" />
<MemberSignature Language="VB.NET" Value="Public Function GetNoTransforms () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool GetNoTransforms();" />
<MemberSignature Language="F#" Value="member this.GetNoTransforms : unit -> bool" Usage="httpCachePolicy.GetNoTransforms " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the status of the HTTP No-Transform Directive.</summary>
<returns>
<see langword="true" /> if the HTTP No-Transform Directive is set; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Enables the sending of the Cache-Control HTTP header.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="GetOmitVaryStar">
<MemberSignature Language="C#" Value="public int GetOmitVaryStar ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance int32 GetOmitVaryStar() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetOmitVaryStar" />
<MemberSignature Language="VB.NET" Value="Public Function GetOmitVaryStar () As Integer" />
<MemberSignature Language="C++ CLI" Value="public:
 int GetOmitVaryStar();" />
<MemberSignature Language="F#" Value="member this.GetOmitVaryStar : unit -> int" Usage="httpCachePolicy.GetOmitVaryStar " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the status of the <see langword="vary:*" /> header.</summary>
<returns>
<see langword="true" /> if the <see langword="vary:*" /> header is omitted; otherwise <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetProxyMaxAge">
<MemberSignature Language="C#" Value="public TimeSpan GetProxyMaxAge ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.TimeSpan GetProxyMaxAge() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetProxyMaxAge" />
<MemberSignature Language="VB.NET" Value="Public Function GetProxyMaxAge () As TimeSpan" />
<MemberSignature Language="C++ CLI" Value="public:
 TimeSpan GetProxyMaxAge();" />
<MemberSignature Language="F#" Value="member this.GetProxyMaxAge : unit -> TimeSpan" Usage="httpCachePolicy.GetProxyMaxAge " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.TimeSpan</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the HTTP Cache-Control: Proxy Max Age.</summary>
<returns>The HTTP Cache-Control: Proxy Max Age.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetRevalidation">
<MemberSignature Language="C#" Value="public System.Web.HttpCacheRevalidation GetRevalidation ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.Web.HttpCacheRevalidation GetRevalidation() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetRevalidation" />
<MemberSignature Language="VB.NET" Value="Public Function GetRevalidation () As HttpCacheRevalidation" />
<MemberSignature Language="C++ CLI" Value="public:
 System::Web::HttpCacheRevalidation GetRevalidation();" />
<MemberSignature Language="F#" Value="member this.GetRevalidation : unit -> System.Web.HttpCacheRevalidation" Usage="httpCachePolicy.GetRevalidation " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Web.HttpCacheRevalidation</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the Cache-Control: header to reflect either the must-revalidate or proxy-revalidate directives.</summary>
<returns>The Cache-Control: header to reflect either the must-revalidate or proxy-revalidate directives.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The default is to not send either of these directives unless explicitly enabled using this method.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="GetUtcLastModified">
<MemberSignature Language="C#" Value="public DateTime GetUtcLastModified ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.DateTime GetUtcLastModified() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetUtcLastModified" />
<MemberSignature Language="VB.NET" Value="Public Function GetUtcLastModified () As DateTime" />
<MemberSignature Language="C++ CLI" Value="public:
 DateTime GetUtcLastModified();" />
<MemberSignature Language="F#" Value="member this.GetUtcLastModified : unit -> DateTime" Usage="httpCachePolicy.GetUtcLastModified " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.DateTime</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the value of the <see langword="Last-Modified" /> HTTP header in Coordinated Universal Time (UTC).</summary>
<returns>The value of the <see langword="Last-Modified" /> HTTP header.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="GetVaryByCustom">
<MemberSignature Language="C#" Value="public string GetVaryByCustom ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance string GetVaryByCustom() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.GetVaryByCustom" />
<MemberSignature Language="VB.NET" Value="Public Function GetVaryByCustom () As String" />
<MemberSignature Language="C++ CLI" Value="public:
 System::String ^ GetVaryByCustom();" />
<MemberSignature Language="F#" Value="member this.GetVaryByCustom : unit -> string" Usage="httpCachePolicy.GetVaryByCustom " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.String</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets the custom string that is used to vary the HTTP caching.</summary>
<returns>The custom string for varying the HTTP caching.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="HasSlidingExpiration">
<MemberSignature Language="C#" Value="public bool HasSlidingExpiration ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool HasSlidingExpiration() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.HasSlidingExpiration" />
<MemberSignature Language="VB.NET" Value="Public Function HasSlidingExpiration () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool HasSlidingExpiration();" />
<MemberSignature Language="F#" Value="member this.HasSlidingExpiration : unit -> bool" Usage="httpCachePolicy.HasSlidingExpiration " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets a value which specifies whether the cache has a sliding expiration policy.</summary>
<returns>
<see langword="true" /> if the cache has a sliding expiration policy; otherwise, <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="IsModified">
<MemberSignature Language="C#" Value="public bool IsModified ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool IsModified() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.IsModified" />
<MemberSignature Language="VB.NET" Value="Public Function IsModified () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool IsModified();" />
<MemberSignature Language="F#" Value="member this.IsModified : unit -> bool" Usage="httpCachePolicy.IsModified " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets a value which specifies whether the HTTP cache has been modified.</summary>
<returns>
<see langword="true" /> if the cache has been modified; otherwise, <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="IsValidUntilExpires">
<MemberSignature Language="C#" Value="public bool IsValidUntilExpires ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool IsValidUntilExpires() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.IsValidUntilExpires" />
<MemberSignature Language="VB.NET" Value="Public Function IsValidUntilExpires () As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 bool IsValidUntilExpires();" />
<MemberSignature Language="F#" Value="member this.IsValidUntilExpires : unit -> bool" Usage="httpCachePolicy.IsValidUntilExpires " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Gets a value which specifies whether the ASP.NET cache should ignore HTTP <see langword="Cache-Control" /> headers sent by the client that invalidate the cache.</summary>
<returns>
<see langword="true" /> if the ASP.NET cache should ignore HTTP <see langword="Cache-Control" /> headers sent by the client; otherwise, <see langword="false" />.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="SetAllowResponseInBrowserHistory">
<MemberSignature Language="C#" Value="public void SetAllowResponseInBrowserHistory (bool allow);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetAllowResponseInBrowserHistory(bool allow) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetAllowResponseInBrowserHistory(System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Public Sub SetAllowResponseInBrowserHistory (allow As Boolean)" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetAllowResponseInBrowserHistory(bool allow);" />
<MemberSignature Language="F#" Value="member this.SetAllowResponseInBrowserHistory : bool -> unit" Usage="httpCachePolicy.SetAllowResponseInBrowserHistory allow" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="allow" Type="System.Boolean" />
</Parameters>
<Docs>
<param name="allow">
<see langword="true" /> to direct the client browser to store responses in the History folder; otherwise <see langword="false" />. The default is <see langword="false" />.</param>
<summary>Makes the response is available in the client browser History cache, regardless of the <see cref="T:System.Web.HttpCacheability" /> setting made on the server, when the <paramref name="allow" /> parameter is <see langword="true" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
When <xref:System.Web.HttpCacheability> is set to <xref:System.Web.HttpCacheability.NoCache> or <xref:System.Web.HttpCacheability.ServerAndNoCache> the `Expires` HTTP header is by default set to -1; this tells the client not to cache responses in the History folder, so that when you use the back/forward buttons the client requests a new version of the response each time. You can override this behavior by calling the <xref:System.Web.HttpCachePolicy.SetAllowResponseInBrowserHistory%2A> method with the `allow` parameter set to `true`.
If <xref:System.Web.HttpCacheability> is set to values other than <xref:System.Web.HttpCacheability.NoCache> or <xref:System.Web.HttpCacheability.ServerAndNoCache>, calling the <xref:System.Web.HttpCachePolicy.SetAllowResponseInBrowserHistory%2A> method with either value for `allow` has no effect.
<xref:System.Web.HttpCachePolicy.SetAllowResponseInBrowserHistory%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how to override the <xref:System.Web.HttpCachePolicy.SetAllowResponseInBrowserHistory%2A> method to direct the client to store the responses in its history in a custom <xref:System.Web.HttpCachePolicy>.
[!code-aspx-csharp[HttpCachePolicySetAllowResponseInBrowserHistory#1](~/samples/snippets/csharp/VS_Snippets_WebNet/HttpCachePolicySetAllowResponseInBrowserHistory/CS/httpcachepolicy_setallowresponseinbrowserhistorycs.aspx#1)]
[!code-aspx-vb[HttpCachePolicySetAllowResponseInBrowserHistory#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/HttpCachePolicySetAllowResponseInBrowserHistory/VB/httpcachepolicy_setallowresponseinbrowserhistoryvb.aspx#1)]
]]></format>
</remarks>
</Docs>
</Member>
<MemberGroup MemberName="SetCacheability">
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Sets the <see langword="Cache-Control" /> HTTP header. The <see langword="Cache-Control" /> HTTP header controls how documents are to be cached on the network.</summary>
</Docs>
</MemberGroup>
<Member MemberName="SetCacheability">
<MemberSignature Language="C#" Value="public void SetCacheability (System.Web.HttpCacheability cacheability);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetCacheability(valuetype System.Web.HttpCacheability cacheability) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetCacheability(System.Web.HttpCacheability)" />
<MemberSignature Language="VB.NET" Value="Public Sub SetCacheability (cacheability As HttpCacheability)" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetCacheability(System::Web::HttpCacheability cacheability);" />
<MemberSignature Language="F#" Value="member this.SetCacheability : System.Web.HttpCacheability -> unit" Usage="httpCachePolicy.SetCacheability cacheability" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="cacheability" Type="System.Web.HttpCacheability" />
</Parameters>
<Docs>
<param name="cacheability">An <see cref="T:System.Web.HttpCacheability" /> enumeration value.</param>
<summary>Sets the <see langword="Cache-Control" /> header to one of the values of <see cref="T:System.Web.HttpCacheability" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Web.HttpCachePolicy.SetCacheability%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how to set the `Cache-Control` header to the enumerated value for `no-cache`.
[!code-csharp[Classic HttpCachePolicy.SetCacheability Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetCacheability Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetCacheability Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetCacheability Example/VB/source.vb#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="cacheability" /> is not one of the enumeration values.</exception>
</Docs>
</Member>
<Member MemberName="SetCacheability">
<MemberSignature Language="C#" Value="public void SetCacheability (System.Web.HttpCacheability cacheability, string field);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetCacheability(valuetype System.Web.HttpCacheability cacheability, string field) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetCacheability(System.Web.HttpCacheability,System.String)" />
<MemberSignature Language="VB.NET" Value="Public Sub SetCacheability (cacheability As HttpCacheability, field As String)" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetCacheability(System::Web::HttpCacheability cacheability, System::String ^ field);" />
<MemberSignature Language="F#" Value="member this.SetCacheability : System.Web.HttpCacheability * string -> unit" Usage="httpCachePolicy.SetCacheability (cacheability, field)" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="cacheability" Type="System.Web.HttpCacheability" />
<Parameter Name="field" Type="System.String" />
</Parameters>
<Docs>
<param name="cacheability">The <see cref="T:System.Web.HttpCacheability" /> enumeration value to set the header to.</param>
<param name="field">The cache control extension to add to the header.</param>
<summary>Sets the <see langword="Cache-Control" /> header to one of the values of <see cref="T:System.Web.HttpCacheability" /> and appends an extension to the directive.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The field name extension is valid only when used with the `private` or `no-cache` directives. For more information, see RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1, available on the [World Wide Web Consortium (W3C) Web site](https://go.microsoft.com/fwlink/?linkid=37125).
This method will throw an invalid argument exception if incompatible directives and extensions are combined.
<xref:System.Web.HttpCachePolicy.SetCacheability%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how the `Cache-Control` header is set to the enumeration value `private` and adds a cache-control extension. The modified directive means that in addition to any non-shared cache, any cache shared only by members of the community named "DEV" may cache the response.
[!code-csharp[Classic HttpCachePolicy.SetCacheability1 Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetCacheability1 Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetCacheability1 Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetCacheability1 Example/VB/source.vb#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="field" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="cacheability" /> is not <see cref="F:System.Web.HttpCacheability.Private" /> or <see cref="F:System.Web.HttpCacheability.NoCache" />.</exception>
</Docs>
</Member>
<Member MemberName="SetETag">
<MemberSignature Language="C#" Value="public void SetETag (string etag);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetETag(string etag) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetETag(System.String)" />
<MemberSignature Language="VB.NET" Value="Public Sub SetETag (etag As String)" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetETag(System::String ^ etag);" />
<MemberSignature Language="F#" Value="member this.SetETag : string -> unit" Usage="httpCachePolicy.SetETag etag" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="etag" Type="System.String" />
</Parameters>
<Docs>
<param name="etag">The text to use for the <see langword="ETag" /> header.</param>
<summary>Sets the <see langword="ETag" /> HTTP header to the specified string.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `ETag` header is a unique identifier for a specific version of a document. It is used by clients to validate client-cached content to avoid requesting it again. Once an `ETag` header is set, subsequent attempts to set it fail and an exception is thrown.
<xref:System.Web.HttpCachePolicy.SetETag%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how to set the `ETag` header to a custom value.
[!code-csharp[Classic HttpCachePolicy.SetETag Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetETag Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetETag Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetETag Example/VB/source.vb#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="etag" /> is <see langword="null" />.</exception>
<exception cref="T:System.InvalidOperationException">The <see langword="ETag" /> header has already been set.
-or-
The <see cref="M:System.Web.HttpCachePolicy.SetETagFromFileDependencies" /> has already been called.</exception>
</Docs>
</Member>
<Member MemberName="SetETagFromFileDependencies">
<MemberSignature Language="C#" Value="public void SetETagFromFileDependencies ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetETagFromFileDependencies() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetETagFromFileDependencies" />
<MemberSignature Language="VB.NET" Value="Public Sub SetETagFromFileDependencies ()" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetETagFromFileDependencies();" />
<MemberSignature Language="F#" Value="member this.SetETagFromFileDependencies : unit -> unit" Usage="httpCachePolicy.SetETagFromFileDependencies " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Sets the <see langword="ETag" /> HTTP header based on the time stamps of the handler's file dependencies.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.HttpCachePolicy.SetETagFromFileDependencies%2A> method sets the `ETag` header by retrieving the last modified time stamps of all files on which the handler is dependent, combining all file names and time stamps into a single string, then hashing that string into a single digest that is used as the `ETag`.
<xref:System.Web.HttpCachePolicy.SetETagFromFileDependencies%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how to set the `ETag` header.
[!code-csharp[Classic HttpCachePolicy.SetETagFromFileDependencies Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetETagFromFileDependencies Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetETagFromFileDependencies Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetETagFromFileDependencies Example/VB/source.vb#1)]
]]></format>
</remarks>
<exception cref="T:System.InvalidOperationException">The <see langword="ETag" /> header has already been set.</exception>
</Docs>
</Member>
<Member MemberName="SetExpires">
<MemberSignature Language="C#" Value="public void SetExpires (DateTime date);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetExpires(valuetype System.DateTime date) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetExpires(System.DateTime)" />
<MemberSignature Language="VB.NET" Value="Public Sub SetExpires (date As DateTime)" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetExpires(DateTime date);" />
<MemberSignature Language="F#" Value="member this.SetExpires : DateTime -> unit" Usage="httpCachePolicy.SetExpires date" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="date" Type="System.DateTime" />
</Parameters>
<Docs>
<param name="date">The absolute <see cref="T:System.DateTime" /> value to set the <see langword="Expires" /> header to.</param>
<summary>Sets the <see langword="Expires" /> HTTP header to an absolute date and time.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method will fail if the expiration date violates the principle of restrictiveness.
## Examples
The following code example demonstrates how to set the expiration time to 6:00 P.M. local time on the current expiration day.
[!code-csharp[Classic HttpCachePolicy.SetExpires Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetExpires Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetExpires Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetExpires Example/VB/source.vb#1)]
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="SetLastModified">
<MemberSignature Language="C#" Value="public void SetLastModified (DateTime date);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetLastModified(valuetype System.DateTime date) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetLastModified(System.DateTime)" />
<MemberSignature Language="VB.NET" Value="Public Sub SetLastModified (date As DateTime)" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetLastModified(DateTime date);" />
<MemberSignature Language="F#" Value="member this.SetLastModified : DateTime -> unit" Usage="httpCachePolicy.SetLastModified date" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="date" Type="System.DateTime" />
</Parameters>
<Docs>
<param name="date">The new <see cref="T:System.DateTime" /> value for the <see langword="Last-Modified" /> header.</param>
<summary>Sets the <see langword="Last-Modified" /> HTTP header to the <see cref="T:System.DateTime" /> value supplied.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `Last-Modified` HTTP header time stamps the document with the `DateTime` value indicating when the document was last modified.
This method will fail if the caching restrictiveness hierarchy is violated.
<xref:System.Web.HttpCachePolicy.SetLastModified%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how to set the `Last-Modified` header to a new date.
[!code-csharp[Classic HttpCachePolicy.SetLastModified Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetLastModified Example/cs/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetLastModified Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetLastModified Example/VB/source.vb#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="date" /> is later than the current <see langword="DateTime" />.</exception>
</Docs>
</Member>
<Member MemberName="SetLastModifiedFromFileDependencies">
<MemberSignature Language="C#" Value="public void SetLastModifiedFromFileDependencies ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetLastModifiedFromFileDependencies() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetLastModifiedFromFileDependencies" />
<MemberSignature Language="VB.NET" Value="Public Sub SetLastModifiedFromFileDependencies ()" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetLastModifiedFromFileDependencies();" />
<MemberSignature Language="F#" Value="member this.SetLastModifiedFromFileDependencies : unit -> unit" Usage="httpCachePolicy.SetLastModifiedFromFileDependencies " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Sets the <see langword="Last-Modified" /> HTTP header based on the time stamps of the handler's file dependencies.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Web.HttpCachePolicy.SetLastModifiedFromFileDependencies%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
## Examples
The following code example demonstrates how to set the `Last-Modified` header using the <xref:System.Web.HttpCachePolicy.SetLastModifiedFromFileDependencies%2A> method.
[!code-csharp[Classic HttpCachePolicy.SetLastModifiedFromFileDependencies Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetLastModifiedFromFileDependencies Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetLastModifiedFromFileDependencies Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetLastModifiedFromFileDependencies Example/VB/source.vb#1)]
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="SetMaxAge">
<MemberSignature Language="C#" Value="public void SetMaxAge (TimeSpan delta);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetMaxAge(valuetype System.TimeSpan delta) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetMaxAge(System.TimeSpan)" />
<MemberSignature Language="VB.NET" Value="Public Sub SetMaxAge (delta As TimeSpan)" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetMaxAge(TimeSpan delta);" />
<MemberSignature Language="F#" Value="member this.SetMaxAge : TimeSpan -> unit" Usage="httpCachePolicy.SetMaxAge delta" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="delta" Type="System.TimeSpan" />
</Parameters>
<Docs>
<param name="delta">The time span used to set the <see langword="Cache" /> - <see langword="Control: max-age" /> header.</param>
<summary>Sets the <see langword="Cache-Control: max-age" /> HTTP header based on the specified time span.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
`Max-age` is the maximum absolute time a document is allowed to exist before being considered stale.
The <xref:System.Web.HttpCachePolicy.SetMaxAge%2A> method does not use sliding expiration and will fail if the expiration date violates the principle of restrictiveness.
<xref:System.Web.HttpCachePolicy.SetMaxAge%2A> is introduced in the .NET Framework version 3.5. For more information, see [Versions and Dependencies](~/docs/framework/migration-guide/versions-and-dependencies.md).
> [!NOTE]
> If the <xref:System.Web.HttpCachePolicy.SetMaxAge%2A> method is called repeatedly, on the second and subsequent calls, the value of the maximum age can only be decreased.
## Examples
The following code example demonstrates how to set the `Cache-Control: max-age` header to 0 hours, 30 minutes, and 0 seconds.
[!code-csharp[Classic HttpCachePolicy.SetMaxAge Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic HttpCachePolicy.SetMaxAge Example/CS/source.cs#1)]
[!code-vb[Classic HttpCachePolicy.SetMaxAge Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic HttpCachePolicy.SetMaxAge Example/VB/source.vb#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="delta" /> is less than 0 or greater than one year.</exception>
</Docs>
</Member>
<Member MemberName="SetNoServerCaching">
<MemberSignature Language="C#" Value="public void SetNoServerCaching ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void SetNoServerCaching() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpCachePolicy.SetNoServerCaching" />
<MemberSignature Language="VB.NET" Value="Public Sub SetNoServerCaching ()" />
<MemberSignature Language="C++ CLI" Value="public:
 void SetNoServerCaching();" />
<MemberSignature Language="F#" Value="member this.SetNoServerCaching : unit -> unit" Usage="httpCachePolicy.SetNoServerCaching " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Stops all origin-server caching for the current response.</summary>