Page Speed Optimization Libraries
1.4.26.1
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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/http/public/request_context.h" 00024 #include "net/instaweb/util/public/basictypes.h" 00025 #include "net/instaweb/util/public/string.h" 00026 #include "net/instaweb/util/public/string_util.h" 00027 00028 #include "net/instaweb/http/public/url_fetcher.h" 00029 00030 namespace net_instaweb { 00031 00032 class MessageHandler; 00033 class RequestHeaders; 00034 class ResponseHeaders; 00035 class Writer; 00036 00039 00042 class ExternalUrlFetcher : public UrlFetcher { 00043 public: 00044 ExternalUrlFetcher() {} 00045 virtual ~ExternalUrlFetcher() {} 00046 00049 virtual bool StreamingFetchUrl(const GoogleString& url, 00050 const RequestHeaders& request_headers, 00051 ResponseHeaders* response_headers, 00052 Writer* writer, 00053 MessageHandler* message_handler, 00054 const RequestContextPtr& request_context); 00055 00056 00058 static const char kDefaultUserAgent[]; 00059 00061 void set_binary(const GoogleString& binary); 00062 00063 00064 protected: 00067 virtual void AppendHeaders(const RequestHeaders& request_headers, 00068 StringVector* escaped_headers); 00069 00070 GoogleString binary_; 00071 00072 private: 00073 virtual const char* GetFetchLabel() = 0; 00074 00080 virtual GoogleString ConstructFetchCommand( 00081 const GoogleString& escaped_url, 00082 const char* user_agent, 00083 const StringVector& escaped_headers) = 0; 00084 00085 DISALLOW_COPY_AND_ASSIGN(ExternalUrlFetcher); 00086 }; 00087 00088 } 00089 00090 #endif ///< NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_