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Raise HTTP/2 receive window sizes

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klzgrad 2024-08-18 10:56:59 +08:00
parent 76e7bbed0f
commit d6391623e5
1 changed files with 32 additions and 1 deletions
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33
src/net/tools/naive/naive_proxy_bin.cc
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@ -173,6 +173,37 @@ std::unique_ptr<URLRequestContext> BuildURLRequestContext(
URLRequestContextBuilder builder; URLRequestContextBuilder builder;
builder.DisableHttpCache(); builder.DisableHttpCache();
// Overrides HTTP/2 initial window size default values to accommodate
// high BDP links.
// See net/http/http_network_session.cc for the default values.
// Alternative implementations than fixed large windows:
// (1) Dynamic window scaling, see
// https://github.com/dotnet/runtime/pull/54755
// and https://grpc.io/blog/grpc-go-perf-improvements/
// This approach estimates throughput and RTT in userspace
// and incurs big architectural complexity.
// (2) Obtains TCP receive windows from Linux-specific TCP_INFO.
// This approach is not portable.
// Security impact:
// This use of non-default settings creates a fingerprinting feature
// that is visible to proxy servers, though this is only exploitable
// if the proxy servers can be MITM'd.
constexpr int kMaxBandwidthMBps = 125;
constexpr double kTypicalRttSecond = 0.256;
constexpr int kMaxBdpMB = kMaxBandwidthMBps * kTypicalRttSecond;
// The windows size should be twice the BDP because WINDOW_UPDATEs
// are sent after half the window is unacknowledged.
constexpr int kTypicalWindow = kMaxBdpMB * 2 * 1024 * 1024;
HttpNetworkSessionParams http_network_session_params;
http_network_session_params.spdy_session_max_recv_window_size =
kTypicalWindow * 2;
http_network_session_params
.http2_settings[spdy::SETTINGS_INITIAL_WINDOW_SIZE] = kTypicalWindow;
builder.set_http_network_session_params(http_network_session_params);
builder.set_net_log(net_log); builder.set_net_log(net_log);
ProxyConfig proxy_config; ProxyConfig proxy_config;
@ -198,7 +229,7 @@ std::unique_ptr<URLRequestContext> BuildURLRequestContext(
CertVerifier::CreateDefault(std::move(cert_net_fetcher))); CertVerifier::CreateDefault(std::move(cert_net_fetcher)));
builder.set_proxy_delegate(std::make_unique<NaiveProxyDelegate>( builder.set_proxy_delegate(std::make_unique<NaiveProxyDelegate>(
config.extra_headers, config.extra_headers,
std::vector<PaddingType>{PaddingType::kVariant1, PaddingType::kNone})); std::vector<PaddingType>{PaddingType::kVariant1, PaddingType::kNone}));
if (config.no_post_quantum == true) { if (config.no_post_quantum == true) {