[Android WebView] Provide a response header for application-provided content

android_webview/browser/net/android_stream_reader_url_request_job.cc

 // Copyright (c) 2012 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.
 
 #include "android_webview/browser/net/android_stream_reader_url_request_job.h"
 
 #include <string>
 
 #include "android_webview/browser/input_stream.h"
 #include "android_webview/browser/net/input_stream_reader.h"
@@ skipping 23 matching lines @@
 using android_webview::InputStreamReader;
 using base::android::AttachCurrentThread;
 using base::PostTaskAndReplyWithResult;
 using content::BrowserThread;
 
 namespace {
 
 const int kHTTPOk = 200;
 const int kHTTPNotFound = 404;
 
+const char kResponseHeaderViaShouldInterceptRequest[] =
+    "Client-Via: shouldInterceptRequest";
 const char kHTTPOkText[] = "OK";
 const char kHTTPNotFoundText[] = "Not Found";
 
 } // namespace
 
 // The requests posted to the worker thread might outlive the job.  Thread-safe
 // ref counting is used to ensure that the InputStream and InputStreamReader
 // members of this class are still there when the closure is run on the worker
 // thread.
 class InputStreamReaderWrapper :
@@ skipping 261 matching lines @@
 
     std::string mime_type;
     if (GetMimeType(&mime_type) && !mime_type.empty()) {
       std::string content_type_header(net::HttpRequestHeaders::kContentType);
       content_type_header.append(": ");
       content_type_header.append(mime_type);
       headers->AddHeader(content_type_header);
     }
   }
 
+  // Indicate that the response had been obtained via shouldInterceptRequest.
+  headers->AddHeader(kResponseHeaderViaShouldInterceptRequest);
+
   response_info_.reset(new net::HttpResponseInfo());
   response_info_->headers = headers;
 
   NotifyHeadersComplete();
 }
 
 int AndroidStreamReaderURLRequestJob::GetResponseCode() const {
   if (response_info_)
     return response_info_->headers->response_code();
   return URLRequestJob::GetResponseCode();
@@ skipping 18 matching lines @@
       } else {
         // We don't support multiple range requests in one single URL request,
         // because we need to do multipart encoding here.
         NotifyDone(net::URLRequestStatus(
             net::URLRequestStatus::FAILED,
             net::ERR_REQUEST_RANGE_NOT_SATISFIABLE));
       }
     }
   }
 }