diff --git a/testing/web-platform/tests/fetch/api/redirect/redirect-method.any.js b/testing/web-platform/tests/fetch/api/redirect/redirect-method.any.js
index c0cdaa85dc063..2fb6537ff5087 100644
--- a/testing/web-platform/tests/fetch/api/redirect/redirect-method.any.js
+++ b/testing/web-platform/tests/fetch/api/redirect/redirect-method.any.js
@@ -10,12 +10,12 @@ expectedMethod
 opts
 )
 {
-var
+let
 url
 =
 redirectUrl
 ;
-var
+let
 urlParameters
 =
 "
@@ -40,7 +40,42 @@ encodeURIComponent
 redirectLocation
 )
 ;
-var
+let
+requestHeaders
+=
+{
+"
+Content
+-
+Encoding
+"
+:
+"
+Identity
+"
+"
+Content
+-
+Language
+"
+:
+"
+en
+-
+US
+"
+"
+Content
+-
+Location
+"
+:
+"
+foo
+"
+}
+;
+let
 requestInit
 =
 {
@@ -56,6 +91,11 @@ redirect
 "
 follow
 "
+"
+headers
+"
+:
+requestHeaders
 }
 ;
 opts
@@ -72,6 +112,7 @@ opts
 .
 body
 )
+{
 requestInit
 .
 body
@@ -80,6 +121,7 @@ opts
 .
 body
 ;
+}
 promise_test
 (
 function
@@ -103,6 +145,27 @@ function
 resp
 )
 {
+let
+expectedRequestContentType
+=
+"
+NO
+"
+;
+if
+(
+opts
+.
+expectedRequestContentType
+)
+{
+expectedRequestContentType
+=
+opts
+.
+expectedRequestContentType
+;
+}
 assert_equals
 (
 resp
@@ -164,6 +227,141 @@ is
 expectedMethod
 )
 ;
+let
+hasRequestBodyHeader
+=
+true
+;
+if
+(
+opts
+.
+expectedStripRequestBodyHeader
+)
+{
+hasRequestBodyHeader
+=
+!
+opts
+.
+expectedStripRequestBodyHeader
+;
+}
+assert_equals
+(
+resp
+.
+headers
+.
+get
+(
+"
+x
+-
+request
+-
+content
+-
+type
+"
+)
+expectedRequestContentType
+"
+Request
+Content
+-
+Type
+after
+redirection
+is
+"
++
+expectedRequestContentType
+)
+;
+[
+"
+Content
+-
+Encoding
+"
+"
+Content
+-
+Language
+"
+"
+Content
+-
+Location
+"
+]
+.
+forEach
+(
+header
+=
+>
+{
+let
+xHeader
+=
+"
+x
+-
+request
+-
+"
++
+header
+.
+toLowerCase
+(
+)
+;
+let
+expectedValue
+=
+hasRequestBodyHeader
+?
+requestHeaders
+[
+header
+]
+:
+"
+NO
+"
+;
+assert_equals
+(
+resp
+.
+headers
+.
+get
+(
+xHeader
+)
+expectedValue
+"
+Request
+"
++
+header
++
+"
+after
+redirection
+is
+"
++
+expectedValue
+)
+;
+}
+)
+;
 assert_true
 (
 resp
@@ -200,6 +398,7 @@ expectedMethod
 POST
 "
 )
+{
 expectedBody
 =
 opts
@@ -211,6 +410,24 @@ requestInit
 .
 body
 ;
+}
+let
+expectedContentLength
+=
+expectedBody
+?
+expectedBody
+.
+length
+.
+toString
+(
+)
+:
+"
+NO
+"
+;
 assert_equals
 (
 text
@@ -221,6 +438,38 @@ body
 "
 )
 ;
+assert_equals
+(
+resp
+.
+headers
+.
+get
+(
+"
+x
+-
+request
+-
+content
+-
+length
+"
+)
+expectedContentLength
+"
+Request
+Content
+-
+Length
+after
+redirection
+is
+"
++
+expectedContentLength
+)
+;
 }
 )
 ;
@@ -424,6 +673,9 @@ GET
 body
 :
 stringBody
+expectedStripRequestBodyHeader
+:
+true
 }
 )
 ;
@@ -486,6 +738,9 @@ GET
 body
 :
 stringBody
+expectedStripRequestBodyHeader
+:
+true
 }
 )
 ;
@@ -548,6 +803,9 @@ GET
 body
 :
 stringBody
+expectedStripRequestBodyHeader
+:
+true
 }
 )
 ;
@@ -574,6 +832,30 @@ redirectMethod
 (
 "
 Redirect
+303
+with
+TESTING
+"
+redirUrl
+locationUrl
+303
+"
+TESTING
+"
+"
+GET
+"
+{
+expectedStripRequestBodyHeader
+:
+true
+}
+)
+;
+redirectMethod
+(
+"
+Redirect
 307
 with
 GET
@@ -614,6 +896,19 @@ POST
 body
 :
 stringBody
+expectedRequestContentType
+:
+"
+text
+/
+plain
+;
+charset
+=
+UTF
+-
+8
+"
 }
 )
 ;
diff --git a/testing/web-platform/tests/fetch/api/resources/method.py b/testing/web-platform/tests/fetch/api/resources/method.py
index a0ab70c40fe29..8f1886d4a8f24 100644
--- a/testing/web-platform/tests/fetch/api/resources/method.py
+++ b/testing/web-platform/tests/fetch/api/resources/method.py
@@ -151,6 +151,166 @@
 )
 )
     
+headers
+.
+append
+(
+(
+"
+x
+-
+request
+-
+content
+-
+type
+"
+request
+.
+headers
+.
+get
+(
+"
+Content
+-
+Type
+"
+"
+NO
+"
+)
+)
+)
+    
+headers
+.
+append
+(
+(
+"
+x
+-
+request
+-
+content
+-
+length
+"
+request
+.
+headers
+.
+get
+(
+"
+Content
+-
+Length
+"
+"
+NO
+"
+)
+)
+)
+    
+headers
+.
+append
+(
+(
+"
+x
+-
+request
+-
+content
+-
+encoding
+"
+request
+.
+headers
+.
+get
+(
+"
+Content
+-
+Encoding
+"
+"
+NO
+"
+)
+)
+)
+    
+headers
+.
+append
+(
+(
+"
+x
+-
+request
+-
+content
+-
+language
+"
+request
+.
+headers
+.
+get
+(
+"
+Content
+-
+Language
+"
+"
+NO
+"
+)
+)
+)
+    
+headers
+.
+append
+(
+(
+"
+x
+-
+request
+-
+content
+-
+location
+"
+request
+.
+headers
+.
+get
+(
+"
+Content
+-
+Location
+"
+"
+NO
+"
+)
+)
+)
+    
 return
 headers
 request