| // Copyright 2018 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. |
| |
| #include "components/data_reduction_proxy/content/common/header_util.h" |
| |
| #include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.h" |
| #include "net/http/http_request_headers.h" |
| #include "url/gurl.h" |
| |
| namespace data_reduction_proxy { |
| |
| void MaybeSetAcceptTransformHeader(const GURL& url, |
| content::ResourceType resource_type, |
| content::PreviewsState previews_state, |
| net::HttpRequestHeaders* headers) { |
| // Previews only operate on HTTP. |
| if (!url.SchemeIs("http")) |
| return; |
| |
| // Chrome-Proxy-Accept-Transform takes at most one token. |
| if (headers->HasHeader(chrome_proxy_accept_transform_header())) |
| return; |
| |
| if (resource_type == content::ResourceType::kMedia) { |
| headers->SetHeader(chrome_proxy_accept_transform_header(), |
| compressed_video_directive()); |
| return; |
| } |
| |
| // Do not add the Chrome-Proxy-Accept-Transform header when the page load |
| // explicitly forbids previews transformations. |
| if (previews_state & content::PREVIEWS_NO_TRANSFORM || |
| previews_state & content::PREVIEWS_OFF) { |
| return; |
| } |
| |
| std::string accept_transform_value; |
| if ((previews_state & content::SERVER_LITE_PAGE_ON) && |
| resource_type == content::ResourceType::kMainFrame) { |
| accept_transform_value = lite_page_directive(); |
| } |
| |
| if (accept_transform_value.empty()) |
| return; |
| |
| headers->SetHeader(chrome_proxy_accept_transform_header(), |
| accept_transform_value); |
| } |
| |
| } // namespace data_reduction_proxy |
