Add CacheControl and refactoring response writers

src/RestSharp/Extensions/HttpResponseExtensions.cs

@@ -13,15 +13,60 @@
 // limitations under the License.
 //
 
+using System.Text;
+
 namespace RestSharp.Extensions;
 
-public static class HttpResponseExtensions {
-    internal static Exception? MaybeException(this HttpResponseMessage httpResponse)
+static class HttpResponseExtensions {
+    public static Exception? MaybeException(this HttpResponseMessage httpResponse)
         => httpResponse.IsSuccessStatusCode
             ? null
-#if NETSTANDARD || NETFRAMEWORK
+#if NET
+            : new HttpRequestException($"Request failed with status code {httpResponse.StatusCode}", null, httpResponse.StatusCode);
+#else
             : new HttpRequestException($"Request failed with status code {httpResponse.StatusCode}");
+#endif
+
+    public static string GetResponseString(this HttpResponseMessage response, byte[] bytes, Encoding clientEncoding) {
+        var encodingString = response.Content.Headers.ContentType?.CharSet;
+        var encoding       = encodingString != null ? TryGetEncoding(encodingString) : clientEncoding;
+
+        using var reader = new StreamReader(new MemoryStream(bytes), encoding);
+        return reader.ReadToEnd();
+
+        Encoding TryGetEncoding(string es) {
+            try {
+                return Encoding.GetEncoding(es);
+            }
+            catch {
+                return Encoding.Default;
+            }
+        }
+    }
+
+    public static Task<Stream?> ReadResponseStream(
+        this HttpResponseMessage httpResponse,
+        Func<Stream, Stream?>?   writer,
+        CancellationToken        cancellationToken = default
+    ) {
+        var readTask = writer == null ? ReadResponse() : ReadAndConvertResponse();
+        return readTask;
+
+        Task<Stream?> ReadResponse() {
+#if NET
+            return httpResponse.Content.ReadAsStreamAsync(cancellationToken)!;
+# else
+            return httpResponse.Content.ReadAsStreamAsync();
+#endif
+        }
+
+        async Task<Stream?> ReadAndConvertResponse() {
+#if NET
+            await using var original = await ReadResponse().ConfigureAwait(false);
 #else
-            : new HttpRequestException($"Request failed with status code {httpResponse.StatusCode}", null, httpResponse.StatusCode);
+            using var original = await ReadResponse().ConfigureAwait(false);
 #endif
+            return writer!(original!);
+        }
+    }
 }

src/RestSharp/Extensions/StreamExtensions.cs

@@ -30,10 +30,10 @@ static class StreamExtensions {
         using var ms = new MemoryStream();
 
         int read;
-#if NETSTANDARD || NETFRAMEWORK
-        while ((read = await input.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false)) > 0)
-#else
+#if NET
         while ((read = await input.ReadAsync(buffer, cancellationToken).ConfigureAwait(false)) > 0)
+#else
+        while ((read = await input.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false)) > 0)
 #endif
             ms.Write(buffer, 0, read);
 

src/RestSharp/Properties/IsExternalInit.cs

@@ -1,4 +1,4 @@
-#if NETSTANDARD || NETFRAMEWORK
+#if !NET
 using System.ComponentModel;
 
 // ReSharper disable once CheckNamespace

src/RestSharp/Request/RestRequest.cs

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 using System.Net;
+using System.Net.Http.Headers;
 using RestSharp.Authenticators;
 using RestSharp.Extensions;
 
@@ -25,8 +26,8 @@ namespace RestSharp;
 /// Container for data used to make requests
 /// </summary>
 public class RestRequest {
-    readonly Func<HttpResponseMessage, RestRequest, RestResponse>? _advancedResponseHandler;
-    readonly Func<Stream, Stream?>?                                _responseWriter;
+    Func<HttpResponseMessage, RestRequest, RestResponse>? _advancedResponseHandler;
+    Func<Stream, Stream?>?                                _responseWriter;
 
     /// <summary>
     /// Default constructor
@@ -186,12 +187,17 @@ public RestRequest(Uri resource, Method method = Method.Get)
     /// </summary>
     public HttpCompletionOption CompletionOption { get; set; } = HttpCompletionOption.ResponseContentRead;
 
+    /// <summary>
+    /// Cache policy to be used for requests using <seealso cref="CacheControlHeaderValue"/>
+    /// </summary>
+    public CacheControlHeaderValue? CachePolicy { get; set; }
+
     /// <summary>
     /// Set this to write response to Stream rather than reading into memory.
     /// </summary>
     public Func<Stream, Stream?>? ResponseWriter {
         get => _responseWriter;
-        init {
+        set {
             if (AdvancedResponseWriter != null)
                 throw new ArgumentException(
                     "AdvancedResponseWriter is not null. Only one response writer can be used."
@@ -206,7 +212,7 @@ public RestRequest(Uri resource, Method method = Method.Get)
     /// </summary>
     public Func<HttpResponseMessage, RestRequest, RestResponse>? AdvancedResponseWriter {
         get => _advancedResponseHandler;
-        init {
+        set {
             if (ResponseWriter != null) throw new ArgumentException("ResponseWriter is not null. Only one response writer can be used.");
 
             _advancedResponseHandler = value;

src/RestSharp/Response/RestResponse.cs

@@ -72,14 +72,13 @@ CancellationToken       cancellationToken
         return request.AdvancedResponseWriter?.Invoke(httpResponse, request) ?? await GetDefaultResponse().ConfigureAwait(false);
 
         async Task<RestResponse> GetDefaultResponse() {
-            var readTask = request.ResponseWriter == null ? ReadResponse() : ReadAndConvertResponse();
-#if NETSTANDARD || NETFRAMEWORK
-            using var stream = await readTask.ConfigureAwait(false);
+#if NET
+            await using var stream = await httpResponse.ReadResponseStream(request.ResponseWriter, cancellationToken).ConfigureAwait(false);
 #else
-            await using var stream = await readTask.ConfigureAwait(false);
+            using var stream = await httpResponse.ReadResponseStream(request.ResponseWriter, cancellationToken).ConfigureAwait(false);
 #endif
 
-            var bytes   = request.ResponseWriter != null || stream == null ? null : await stream.ReadAsBytes(cancellationToken).ConfigureAwait(false);
+            var bytes   = stream == null ? null : await stream.ReadAsBytes(cancellationToken).ConfigureAwait(false);
             var content = bytes  == null ? null : httpResponse.GetResponseString(bytes, encoding);
 
             return new RestResponse(request) {
@@ -101,17 +100,6 @@ CancellationToken       cancellationToken
                 Cookies             = cookieCollection,
                 RootElement         = request.RootElement
             };
-
-            Task<Stream?> ReadResponse() => httpResponse.ReadResponse(cancellationToken);
-
-            async Task<Stream?> ReadAndConvertResponse() {
-#if NETSTANDARD || NETFRAMEWORK
-                using var original = await ReadResponse().ConfigureAwait(false);
-#else
-                await using var original = await ReadResponse().ConfigureAwait(false);
-#endif
-                return request.ResponseWriter!(original!);
-            }
         }
     }
 

src/RestSharp/RestClient.Async.cs

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 using System.Net;
+using System.Net.Http.Headers;
 using RestSharp.Extensions;
 
 namespace RestSharp;
@@ -52,16 +53,7 @@ public partial class RestClient {
 
         if (response.ResponseMessage == null) return null;
 
-        if (request.ResponseWriter != null) {
-#if NETSTANDARD || NETFRAMEWORK
-            using var stream = await response.ResponseMessage.ReadResponse(cancellationToken).ConfigureAwait(false);
-#else
-            await using var stream = await response.ResponseMessage.ReadResponse(cancellationToken).ConfigureAwait(false);
-#endif
-            return request.ResponseWriter(stream!);
-        }
-
-        return await response.ResponseMessage.ReadResponse(cancellationToken).ConfigureAwait(false);
+        return await response.ResponseMessage.ReadResponseStream(request.ResponseWriter, cancellationToken).ConfigureAwait(false);
     }
 
     static RestResponse GetErrorResponse(RestRequest request, Exception exception, CancellationToken timeoutToken) {
@@ -95,7 +87,7 @@ public partial class RestClient {
         var url        = this.BuildUri(request);
         var message    = new HttpRequestMessage(httpMethod, url) { Content = requestContent.BuildContent() };
         message.Headers.Host         = Options.BaseHost;
-        message.Headers.CacheControl = Options.CachePolicy;
+        message.Headers.CacheControl = request.CachePolicy ?? Options.CachePolicy;
 
         using var timeoutCts = new CancellationTokenSource(request.Timeout > 0 ? request.Timeout : int.MaxValue);
         using var cts        = CancellationTokenSource.CreateLinkedTokenSource(timeoutCts.Token, cancellationToken);

src/RestSharp/RestClient.Extensions.cs

@@ -294,10 +294,10 @@ public static RestResponse Post(this IRestClient client, RestRequest request)
     /// <returns>The downloaded file.</returns>
     [PublicAPI]
     public static async Task<byte[]?> DownloadDataAsync(this IRestClient client, RestRequest request, CancellationToken cancellationToken = default) {
-#if NETSTANDARD || NETFRAMEWORK
-        using var stream = await client.DownloadStreamAsync(request, cancellationToken).ConfigureAwait(false);
-#else
+#if NET
         await using var stream = await client.DownloadStreamAsync(request, cancellationToken).ConfigureAwait(false);
+#else
+        using var stream = await client.DownloadStreamAsync(request, cancellationToken).ConfigureAwait(false);
 #endif
         return stream == null ? null : await stream.ReadAsBytes(cancellationToken).ConfigureAwait(false);
     }

test/RestSharp.Tests.Integrated/DownloadFileTests.cs

@@ -34,13 +34,15 @@ public sealed class DownloadFileTests : IDisposable {
     public async Task AdvancedResponseWriter_without_ResponseWriter_reads_stream() {
         var tag = string.Empty;
 
-        var rr = new RestRequest("Assets/Koala.jpg") {
-            AdvancedResponseWriter = (response, request) => {
-                var buf = new byte[16];
-                response.Content.ReadAsStream().Read(buf, 0, buf.Length);
-                tag = Encoding.ASCII.GetString(buf, 6, 4);
-                return new RestResponse(request);
-            }
+        // ReSharper disable once UseObjectOrCollectionInitializer
+        var rr = new RestRequest("Assets/Koala.jpg");
+
+        rr.AdvancedResponseWriter = (response, request) => {
+            var buf = new byte[16];
+            // ReSharper disable once MustUseReturnValue
+            response.Content.ReadAsStream().Read(buf, 0, buf.Length);
+            tag = Encoding.ASCII.GetString(buf, 6, 4);
+            return new RestResponse(request);
         };
 
         await _client.ExecuteAsync(rr);
@@ -50,7 +52,7 @@ public sealed class DownloadFileTests : IDisposable {
     [Fact]
     public async Task Handles_File_Download_Failure() {
         var request = new RestRequest("Assets/Koala1.jpg");
-        var task = () => _client.DownloadDataAsync(request);
+        var task    = () => _client.DownloadDataAsync(request);
         await task.Should().ThrowAsync<HttpRequestException>().WithMessage("Request failed with status code NotFound");
     }
 
@@ -67,13 +69,14 @@ public sealed class DownloadFileTests : IDisposable {
     public async Task Writes_Response_To_Stream() {
         var tempFile = Path.GetTempFileName();
 
-        var request = new RestRequest("Assets/Koala.jpg") {
-            ResponseWriter = responseStream => {
-                using var writer = File.OpenWrite(tempFile);
+        // ReSharper disable once UseObjectOrCollectionInitializer
+        var request = new RestRequest("Assets/Koala.jpg");
 
-                responseStream.CopyTo(writer);
-                return null;
-            }
+        request.ResponseWriter = responseStream => {
+            using var writer = File.OpenWrite(tempFile);
+
+            responseStream.CopyTo(writer);
+            return null;
         };
         var response = await _client.DownloadDataAsync(request);
 

test/RestSharp.Tests.Integrated/RedirectTests.cs

@@ -0,0 +1,46 @@
+//  Copyright (c) .NET Foundation and Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+using System.Net;
+using RestSharp.Tests.Integrated.Server;
+
+namespace RestSharp.Tests.Integrated;
+
+[Collection(nameof(TestServerCollection))]
+public class RedirectTests {
+    readonly RestClient _client;
+
+    public RedirectTests(TestServerFixture fixture, ITestOutputHelper output) {
+        var options = new RestClientOptions(fixture.Server.Url) {
+            FollowRedirects = true
+        };
+        _client = new RestClient(options);
+    }
+
+    [Fact]
+    public async Task Can_Perform_GET_Async_With_Redirect() {
+        const string val = "Works!";
+
+        var request = new RestRequest("redirect");
+
+        var response = await _client.ExecuteAsync<Response>(request);
+        response.StatusCode.Should().Be(HttpStatusCode.OK);
+        response.Data!.Message.Should().Be(val);
+    }
+
+    class Response {
+        public string? Message { get; set; }
+    }
+}

test/RestSharp.Tests.Integrated/Server/TestServer.cs

@@ -40,6 +40,7 @@ public sealed class HttpServer {
         // Cookies
         _app.MapGet("get-cookies", CookieHandlers.HandleCookies);
         _app.MapGet("set-cookies", CookieHandlers.HandleSetCookies);
+        _app.MapGet("redirect", () => Results.Redirect("/success", false, true));
 
         // PUT
         _app.MapPut(

test/RestSharp.Tests/OptionsTests.cs

@@ -0,0 +1,16 @@
+namespace RestSharp.Tests;
+
+public class OptionsTests {
+    [Fact]
+    public void Ensure_follow_redirect() {
+        var value   = false;
+        var options = new RestClientOptions { FollowRedirects = true, ConfigureMessageHandler = Configure};
+        var _  = new RestClient(options);
+        value.Should().BeTrue();
+
+        HttpMessageHandler Configure(HttpMessageHandler handler) {
+            value = ((handler as HttpClientHandler)!).AllowAutoRedirect;
+            return handler;
+        }
+    }
+}