1 // Copyright 2011 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // This file intentionally does not have header guards, it's included 6 // inside a macro to generate values. The following line silences a 7 // presubmit warning that would otherwise be triggered by this: 8 // no-include-guard-because-multiply-included 9 // NOLINT(build/header_guard) 10 11 // This is the list of load flags and their values. For the enum values, 12 // include the file "net/base/load_flags.h". 13 // 14 // Here we define the values using a macro LOAD_FLAG, so it can be 15 // expanded differently in some places (for example, to automatically 16 // map a load flag value to its symbolic name). 17 18 LOAD_FLAG(NORMAL, 0) 19 20 // This is "normal reload", meaning an if-none-match/if-modified-since query. 21 // All other caches are used as normal. 22 LOAD_FLAG(VALIDATE_CACHE, 1 << 0) 23 24 // This is "shift-reload", meaning a "pragma: no-cache" end-to-end fetch. 25 // The response is not read from the HTTP cache but is written to the cache, 26 // unlike in `DISABLE_CACHE`. All other caches are used as normal. 27 LOAD_FLAG(BYPASS_CACHE, 1 << 1) 28 29 // This is a back/forward style navigation where the cached content should 30 // be preferred over any protocol specific cache validation. 31 LOAD_FLAG(SKIP_CACHE_VALIDATION, 1 << 2) 32 33 // This is a navigation that will fail if it cannot serve the requested 34 // resource from the cache (or some equivalent local store). 35 LOAD_FLAG(ONLY_FROM_CACHE, 1 << 3) 36 37 // This is a request whose response will not be read or written to the HTTP 38 // cache. It does not impact the cache-related HTTP request headers. All other 39 // caches are used as normal. 40 LOAD_FLAG(DISABLE_CACHE, 1 << 4) 41 42 // If present, causes dependent network fetches (AIA, CRLs, OCSP) to be 43 // skipped on secure connections. 44 LOAD_FLAG(DISABLE_CERT_NETWORK_FETCHES, 1 << 5) 45 46 // This load will not make any changes to cookies, including storing new 47 // cookies or updating existing ones. 48 // Deprecated. Use URLRequest::set_allow_credentials instead. See 49 // https://crbug.com/799935. 50 LOAD_FLAG(DO_NOT_SAVE_COOKIES, 1 << 6) 51 52 // Do not resolve proxies. This override is used when downloading PAC files 53 // to avoid having a circular dependency. 54 LOAD_FLAG(BYPASS_PROXY, 1 << 7) 55 56 // DO NOT USE THIS FLAG 57 // The network stack should not have frame level knowledge. Any pre-connect 58 // or pre-resolution requiring that knowledge should be done from the 59 // stack embedder. 60 // Indicate that this is a top level frame, so that we don't assume it is a 61 // subresource and speculatively pre-connect or pre-resolve when a referring 62 // page is loaded. 63 LOAD_FLAG(MAIN_FRAME_DEPRECATED, 1 << 8) 64 65 // Indicates that this load was motivated by the rel=prefetch feature, or the 66 // speculationrules prefetch feature, and is (in theory) not intended for the 67 // current frame. 68 LOAD_FLAG(PREFETCH, 1 << 9) 69 70 // Indicates that this load could cause deadlock if it has to wait for another 71 // request. Overrides socket limits. Must always be used with MAXIMUM_PRIORITY. 72 LOAD_FLAG(IGNORE_LIMITS, 1 << 10) 73 74 // Indicates that the username:password portion of the URL should not 75 // be honored, but that other forms of authority may be used. 76 LOAD_FLAG(DO_NOT_USE_EMBEDDED_IDENTITY, 1 << 11) 77 78 // Indicates that this request is not to be migrated to a cellular network when 79 // QUIC connection migration is enabled. 80 LOAD_FLAG(DISABLE_CONNECTION_MIGRATION_TO_CELLULAR, 1 << 12) 81 82 // Indicates that the cache should not check that the request matches the 83 // response's vary header. 84 LOAD_FLAG(SKIP_VARY_CHECK, 1 << 13) 85 86 // The creator of this URLRequest wishes to receive stale responses when allowed 87 // by the "Cache-Control: stale-while-revalidate" directive and is able to issue 88 // an async revalidation to update the cache. If the callee needs to revalidate 89 // the resource |async_revalidation_requested| attribute will be set on the 90 // associated HttpResponseInfo. If indicated the callee should revalidate the 91 // resource by issuing a new request without this flag set. If the revalidation 92 // does not complete in 60 seconds, the cache treat the stale resource as 93 // invalid, as it did not specify stale-while-revalidate. 94 LOAD_FLAG(SUPPORT_ASYNC_REVALIDATION, 1 << 14) 95 96 // Indicates that a prefetch request's cached response should be restricted in 97 // in terms of reuse. The cached response can only be reused by requests with 98 // the LOAD_CAN_USE_RESTRICTED_PREFETCH load flag. 99 LOAD_FLAG(RESTRICTED_PREFETCH, 1 << 15) 100 101 // This flag must be set on requests that are allowed to reuse cache entries 102 // that are marked as RESTRICTED_PREFETCH. Requests without this flag cannot 103 // reuse restricted prefetch responses in the cache. Restricted response reuse 104 // is considered privileged, and therefore this flag must only be set from a 105 // trusted process. 106 LOAD_FLAG(CAN_USE_RESTRICTED_PREFETCH, 1 << 16) 107 108 // Indicates that this load can use a shared dictionary. 109 LOAD_FLAG(CAN_USE_SHARED_DICTIONARY, 1 << 17) 110 111 // Indicates that CAN_USE_SHARED_DICTIONARY must be disabled after a redirect to 112 // another origin. 113 LOAD_FLAG(DISABLE_SHARED_DICTIONARY_AFTER_CROSS_ORIGIN_REDIRECT, 1 << 18) 114 115 // This flag is used to bypass HSTS upgrades. This flag must be set for AIA, 116 // CRL, and OCSP requests in order to prevent circular dependencies. 117 LOAD_FLAG(SHOULD_BYPASS_HSTS, 1 << 19) 118