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--- a/chrome/browser/ungoogled_flag_entries.h
+++ b/chrome/browser/ungoogled_flag_entries.h
@@ -96,4 +96,8 @@
"Disable GREASE for TLS",
"Turn off GREASE (Generate Random Extensions And Sustain Extensibility) for TLS connections. ungoogled-chromium flag.",
kOsAll, SINGLE_VALUE_TYPE("disable-grease-tls")},
+ {"http-accept-header",
+ "Custom HTTP Accept Header",
+ "Set a custom value for the Accept header which is sent by the browser with every HTTP request. (e.g. `text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8`). ungoogled-chromium flag.",
+ kOsAll, ORIGIN_LIST_VALUE_TYPE("http-accept-header", "")},
#endif // CHROME_BROWSER_UNGOOGLED_FLAG_ENTRIES_H_
--- a/components/flags_ui/flags_state.cc
+++ b/components/flags_ui/flags_state.cc
@@ -209,6 +209,7 @@ std::string GetCombinedOriginListValue(c
const std::string new_value =
flags_storage.GetOriginListFlag(internal_entry_name);
if (command_line_switch == "custom-ntp") return existing_value.empty() ? new_value : existing_value;
+ if (command_line_switch == "http-accept-header") return existing_value.empty() ? new_value : existing_value;
return CombineAndSanitizeOriginLists(existing_value, new_value);
}
@@ -398,6 +399,7 @@ void FlagsState::SetOriginListFlag(const
FlagsStorage* flags_storage) {
const std::string new_value =
internal_name == "custom-ntp" ? value :
+ internal_name == "http-accept-header" ? value :
CombineAndSanitizeOriginLists(std::string(), value);
flags_storage->SetOriginListFlag(internal_name, new_value);
--- a/content/public/browser/frame_accept_header.cc
+++ b/content/public/browser/frame_accept_header.cc
@@ -4,6 +4,7 @@
#include "content/public/browser/frame_accept_header.h"
+#include "base/command_line.h"
#include "content/browser/web_package/signed_exchange_consts.h"
#include "content/browser/web_package/signed_exchange_utils.h"
#include "content/common/content_constants_internal.h"
@@ -14,6 +15,9 @@ namespace content {
std::string FrameAcceptHeaderValue(bool allow_sxg_responses,
BrowserContext* browser_context) {
+ if (base::CommandLine::ForCurrentProcess()->HasSwitch("http-accept-header"))
+ return base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII("http-accept-header");
+
std::string header_value = kFrameAcceptHeaderValue;
#if BUILDFLAG(ENABLE_JXL_DECODER)
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