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diff --git a/webkit/appcache/appcache_request_handler.h b/webkit/appcache/appcache_request_handler.h
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+++ b/webkit/appcache/appcache_request_handler.h
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+// Copyright (c) 2009 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.
+
+#ifndef WEBKIT_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
+#define WEBKIT_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
+
+#include "net/url_request/url_request.h"
+#include "webkit/appcache/appcache_host.h"
+
+class URLRequest;
+class URLRequestJob;
+
+namespace appcache {
+
+// An instance is created for each URLRequest. The instance survives all
+// http transactions involved in the processing of its URLRequest, and is
+// given the opportunity to hijack the request along the way. Callers
+// should use AppCacheHost::CreateRequestHandler to manufacture instances
+// that can retrieve resources for a particular host.
+class AppCacheRequestHandler : public URLRequest::UserData {
+ public:
+  // Should be called on each request intercept opportunity.
+  URLRequestJob* MaybeLoadResource(URLRequest* request);
+  URLRequestJob* MaybeLoadFallbackForRedirect(URLRequest* request,
+                                              const GURL& location);
+  URLRequestJob* MaybeLoadFallbackForResponse(URLRequest* request);
+
+  void GetExtraResponseInfo(int64* cache_id, GURL* manifest_url);
+
+ private:
+  friend class AppCacheHost;
+
+  // Ctor for main resource loads.
+  explicit AppCacheRequestHandler(AppCacheHost* host);
+
+  // Ctor for subresource loads when the cache is loaded.
+  explicit AppCacheRequestHandler(AppCache* cache);
+
+  // Main vs subresource loads are very different.
+  // TODO(michaeln): maybe have two derived classes?
+  bool is_main_request_;
+  int64 cache_id_;
+  scoped_refptr<AppCache> cache_;
+  base::WeakPtr<AppCacheHost> host_;
+  scoped_refptr<URLRequestJob> job_;
+  AppCacheService* service_;
+};
+
+}  // namespace appcache
+
+#endif  // WEBKIT_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
+