Pass raw response with Context-Encoding sdch if support is not configured.

components/cronet/ios/test/cronet_http_test.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cronet/Cronet.h>
 #import <Foundation/Foundation.h>
 
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 178 matching lines @@
 
 TEST_F(HttpTest, SdchDisabledByDefault) {
   NSURL* url =
       net::NSURLWithGURL(GURL(TestServer::GetEchoHeaderURL("Accept-Encoding")));
   NSURLSessionDataTask* task = [session_ dataTaskWithURL:url];
   StartDataTaskAndWaitForCompletion(task);
   EXPECT_EQ(nil, [delegate_ error]);
   EXPECT_FALSE([[delegate_ responseBody] containsString:@"sdch"]);
 }
 
+// Verify that explictly setting Accept-Encoding request header to 'gzip,sdch"
+// is passed to the server and does not trigger any failures. This behavior may
+// In the future Cronet may not allow caller to set Accept-Encoding header and
+// could limit it to set of internally suported and enabled encodings, matching
+// behavior of Cronet on Android.
+TEST_F(HttpTest, AcceptEncodingSdchIsAllowed) {
+  NSURL* url =
+      net::NSURLWithGURL(GURL(TestServer::GetEchoHeaderURL("Accept-Encoding")));
+  NSMutableURLRequest* mutableRequest =
+      [[NSURLRequest requestWithURL:url] mutableCopy];
+  [mutableRequest addValue:@"gzip,sdch" forHTTPHeaderField:@"Accept-Encoding"];
+  NSURLSessionDataTask* task = [session_ dataTaskWithRequest:mutableRequest];
+  StartDataTaskAndWaitForCompletion(task);
+  EXPECT_EQ(nil, [delegate_ error]);
+  EXPECT_TRUE([[delegate_ responseBody] containsString:@"gzip,sdch"]);
+}
+
+// Verify that explictly setting Accept-Encoding request header to 'foo,bar"
+// is passed to the server and does not trigger any failures. This behavior may
+// In the future Cronet may not allow caller to set Accept-Encoding header and
+// could limit it to set of internally suported and enabled encodings, matching
+// behavior of Cronet on Android.
+TEST_F(HttpTest, AcceptEncodingFooBarIsAllowed) {
+  NSURL* url =
+      net::NSURLWithGURL(GURL(TestServer::GetEchoHeaderURL("Accept-Encoding")));
+  NSMutableURLRequest* mutableRequest =
+      [[NSURLRequest requestWithURL:url] mutableCopy];
+  [mutableRequest addValue:@"foo,bar" forHTTPHeaderField:@"Accept-Encoding"];
+  NSURLSessionDataTask* task = [session_ dataTaskWithRequest:mutableRequest];
+  StartDataTaskAndWaitForCompletion(task);
+  EXPECT_EQ(nil, [delegate_ error]);
+  EXPECT_TRUE([[delegate_ responseBody] containsString:@"foo,bar"]);
+}
+
 TEST_F(HttpTest, NSURLSessionAcceptLanguage) {
   NSURL* url =
       net::NSURLWithGURL(GURL(TestServer::GetEchoHeaderURL("Accept-Language")));
   NSURLSessionDataTask* task = [session_ dataTaskWithURL:url];
   StartDataTaskAndWaitForCompletion(task);
   EXPECT_EQ(nil, [delegate_ error]);
   ASSERT_STREQ("en-US,en", [[delegate_ responseBody] UTF8String]);
 }
 
 TEST_F(HttpTest, SetUserAgentIsExact) {
@@ skipping 18 matching lines @@
   }];
   StartDataTaskAndWaitForCompletion(task);
   EXPECT_TRUE(block_used);
   EXPECT_EQ(nil, [delegate_ error]);
   EXPECT_FALSE([[delegate_ responseBody]
       containsString:base::SysUTF8ToNSString(kUserAgent)]);
   EXPECT_TRUE([[delegate_ responseBody] containsString:@"CFNetwork"]);
 }
 
 }  // namespace cronet