Page Speed Optimization Libraries
1.2.24.1
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00001 /* 00002 * Copyright 2010 Google Inc. 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http:///www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00019 00020 #ifndef NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_ 00021 #define NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_ 00022 00023 #include "net/instaweb/util/public/basictypes.h" 00024 #include "net/instaweb/util/public/string.h" 00025 #include "net/instaweb/util/public/string_util.h" 00026 #include "net/instaweb/http/public/url_fetcher.h" 00027 00028 namespace net_instaweb { 00029 00030 class MessageHandler; 00031 class RequestHeaders; 00032 class ResponseHeaders; 00033 class Writer; 00034 00037 00040 class ExternalUrlFetcher : public UrlFetcher { 00041 public: 00042 ExternalUrlFetcher() {} 00043 virtual ~ExternalUrlFetcher() {} 00044 00047 virtual bool StreamingFetchUrl(const GoogleString& url, 00048 const RequestHeaders& request_headers, 00049 ResponseHeaders* response_headers, 00050 Writer* writer, 00051 MessageHandler* message_handler); 00052 00053 00055 static const char kDefaultUserAgent[]; 00056 00058 void set_binary(const GoogleString& binary); 00059 00060 00061 protected: 00064 virtual void AppendHeaders(const RequestHeaders& request_headers, 00065 StringVector* escaped_headers); 00066 00067 GoogleString binary_; 00068 00069 private: 00070 virtual const char* GetFetchLabel() = 0; 00071 00077 virtual GoogleString ConstructFetchCommand( 00078 const GoogleString& escaped_url, 00079 const char* user_agent, 00080 const StringVector& escaped_headers) = 0; 00081 00082 DISALLOW_COPY_AND_ASSIGN(ExternalUrlFetcher); 00083 }; 00084 00085 } 00086 00087 #endif ///< NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_