1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "chrome/browser/net/connect_interceptor.h" 6 7 #include "chrome/browser/net/predictor_api.h" 8 #include "net/base/load_flags.h" 9 10 namespace chrome_browser_net { 11 12 ConnectInterceptor::ConnectInterceptor() { 13 net::URLRequest::RegisterRequestInterceptor(this); 14 } 15 16 ConnectInterceptor::~ConnectInterceptor() { 17 net::URLRequest::UnregisterRequestInterceptor(this); 18 } 19 20 net::URLRequestJob* ConnectInterceptor::MaybeIntercept( 21 net::URLRequest* request) { 22 GURL request_scheme_host(request->url().GetWithEmptyPath()); 23 24 // Learn what URLs are likely to be needed during next startup. 25 LearnAboutInitialNavigation(request_scheme_host); 26 27 bool redirected_host = false; 28 if (request->referrer().empty()) { 29 if (request->url() != request->original_url()) { 30 // This request was completed with a redirect. 31 GURL original_scheme_host(request->original_url().GetWithEmptyPath()); 32 if (request_scheme_host != original_scheme_host) { 33 redirected_host = true; 34 // Don't learn from redirects that take path as an argument, but do 35 // learn from short-hand typing entries, such as "cnn.com" redirects to 36 // "www.cnn.com". We can't just check for has_path(), as a mere "/" 37 // will count as a path, so we check that the path is at most a "/" 38 // (1 character long) to decide the redirect is "definitive" and has no 39 // significant path. 40 // TODO(jar): It may be ok to learn from all redirects, as the adaptive 41 // system will not respond until several identical redirects have taken 42 // place. Hence a use of a path (that changes) wouldn't really be 43 // learned from anyway. 44 if (request->original_url().path().length() <= 1) { 45 // TODO(jar): These definite redirects could be learned much faster. 46 LearnFromNavigation(original_scheme_host, request_scheme_host); 47 } 48 } 49 } 50 } else { 51 GURL referring_scheme_host = GURL(request->referrer()).GetWithEmptyPath(); 52 bool is_subresource = !(request->load_flags() & net::LOAD_MAIN_FRAME); 53 // Learn about our referring URL, for use in the future. 54 if (is_subresource) 55 LearnFromNavigation(referring_scheme_host, request_scheme_host); 56 if (referring_scheme_host == request_scheme_host) { 57 // We've already made any/all predictions when we navigated to the 58 // referring host, so we can bail out here. 59 return NULL; 60 } 61 } 62 63 // Subresources for main frames usually get predicted when we detected the 64 // main frame request - way back in RenderViewHost::Navigate. So only handle 65 // predictions now for subresources or for redirected hosts. 66 if ((request->load_flags() & net::LOAD_SUB_FRAME) || redirected_host) 67 PredictFrameSubresources(request_scheme_host); 68 return NULL; 69 } 70 71 net::URLRequestJob* ConnectInterceptor::MaybeInterceptResponse( 72 net::URLRequest* request) { 73 return NULL; 74 } 75 76 net::URLRequestJob* ConnectInterceptor::MaybeInterceptRedirect( 77 net::URLRequest* request, 78 const GURL& location) { 79 return NULL; 80 } 81 82 } // namespace chrome_browser_net 83