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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "shrpx_http_downstream_connection.h"
#include "shrpx_client_handler.h"
#include "shrpx_upstream.h"
#include "shrpx_downstream.h"
#include "shrpx_config.h"
#include "shrpx_error.h"
#include "shrpx_http.h"
#include "shrpx_log_config.h"
#include "shrpx_connect_blocker.h"
#include "shrpx_downstream_connection_pool.h"
#include "shrpx_worker.h"
#include "shrpx_http2_session.h"
#include "http2.h"
#include "util.h"
using namespace nghttp2;
namespace shrpx {
namespace {
void timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Time out";
}
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
// Do this so that dconn is not pooled
downstream->set_response_connection_close(true);
if (upstream->downstream_error(dconn, Downstream::EVENT_TIMEOUT) != 0) {
delete handler;
}
}
} // namespace
namespace {
void readcb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
if (upstream->downstream_read(dconn) != 0) {
delete handler;
}
}
} // namespace
namespace {
void writecb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
if (upstream->downstream_write(dconn) != 0) {
delete handler;
}
}
} // namespace
namespace {
void connectcb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
if (dconn->on_connect() != 0) {
if (upstream->on_downstream_abort_request(downstream, 503) != 0) {
delete handler;
}
return;
}
writecb(loop, w, revents);
}
} // namespace
HttpDownstreamConnection::HttpDownstreamConnection(
DownstreamConnectionPool *dconn_pool, size_t group, struct ev_loop *loop)
: DownstreamConnection(dconn_pool),
conn_(loop, -1, nullptr, nullptr, get_config()->downstream_write_timeout,
get_config()->downstream_read_timeout, 0, 0, 0, 0, connectcb,
readcb, timeoutcb, this),
ioctrl_(&conn_.rlimit), response_htp_{0}, group_(group), addr_idx_(0),
connected_(false) {}
HttpDownstreamConnection::~HttpDownstreamConnection() {}
int HttpDownstreamConnection::attach_downstream(Downstream *downstream) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Attaching to DOWNSTREAM:" << downstream;
}
if (conn_.fd == -1) {
auto connect_blocker = client_handler_->get_connect_blocker();
if (connect_blocker->blocked()) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this)
<< "Downstream connection was blocked by connect_blocker";
}
return -1;
}
auto worker = client_handler_->get_worker();
auto &next_downstream = worker->get_dgrp(group_)->next;
auto end = next_downstream;
auto &addrs = get_config()->downstream_addr_groups[group_].addrs;
for (;;) {
auto &addr = addrs[next_downstream];
auto i = next_downstream;
if (++next_downstream >= addrs.size()) {
next_downstream = 0;
}
conn_.fd = util::create_nonblock_socket(addr.addr.su.storage.ss_family);
if (conn_.fd == -1) {
auto error = errno;
DCLOG(WARN, this) << "socket() failed; errno=" << error;
connect_blocker->on_failure();
return SHRPX_ERR_NETWORK;
}
int rv;
rv = connect(conn_.fd, &addr.addr.su.sa, addr.addr.len);
if (rv != 0 && errno != EINPROGRESS) {
auto error = errno;
DCLOG(WARN, this) << "connect() failed; errno=" << error;
connect_blocker->on_failure();
close(conn_.fd);
conn_.fd = -1;
if (end == next_downstream) {
return SHRPX_ERR_NETWORK;
}
// Try again with the next downstream server
continue;
}
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Connecting to downstream server";
}
addr_idx_ = i;
ev_io_set(&conn_.wev, conn_.fd, EV_WRITE);
ev_io_set(&conn_.rev, conn_.fd, EV_READ);
conn_.wlimit.startw();
break;
}
// TODO we should have timeout for connection establishment
ev_timer_again(conn_.loop, &conn_.wt);
} else {
// we may set read timer cb to idle_timeoutcb. Reset again.
conn_.rt.repeat = get_config()->downstream_read_timeout;
ev_set_cb(&conn_.rt, timeoutcb);
ev_timer_again(conn_.loop, &conn_.rt);
ev_set_cb(&conn_.rev, readcb);
}
downstream_ = downstream;
http_parser_init(&response_htp_, HTTP_RESPONSE);
response_htp_.data = downstream_;
return 0;
}
int HttpDownstreamConnection::push_request_headers() {
auto downstream_hostport = get_config()
->downstream_addr_groups[group_]
.addrs[addr_idx_]
.hostport.get();
auto method = downstream_->get_request_method();
auto connect_method = method == HTTP_CONNECT;
// For HTTP/1.0 request, there is no authority in request. In that
// case, we use backend server's host nonetheless.
const char *authority = downstream_hostport;
auto &req_authority = downstream_->get_request_http2_authority();
auto no_host_rewrite = get_config()->no_host_rewrite ||
get_config()->http2_proxy ||
get_config()->client_proxy || connect_method;
if (no_host_rewrite && !req_authority.empty()) {
authority = req_authority.c_str();
}
auto authoritylen = strlen(authority);
downstream_->set_request_downstream_host(authority);
downstream_->assemble_request_cookie();
auto buf = downstream_->get_request_buf();
// Assume that method and request path do not contain \r\n.
auto meth = http2::to_method_string(method);
buf->append(meth, strlen(meth));
buf->append(" ");
auto &scheme = downstream_->get_request_http2_scheme();
auto &path = downstream_->get_request_path();
if (connect_method) {
buf->append(authority, authoritylen);
} else if (get_config()->http2_proxy || get_config()->client_proxy) {
// Construct absolute-form request target because we are going to
// send a request to a HTTP/1 proxy.
assert(!scheme.empty());
buf->append(scheme);
buf->append("://");
buf->append(authority, authoritylen);
buf->append(path);
} else if (method == HTTP_OPTIONS && path.empty()) {
// Server-wide OPTIONS
buf->append("*");
} else {
buf->append(path);
}
buf->append(" HTTP/1.1\r\nHost: ");
buf->append(authority, authoritylen);
buf->append("\r\n");
http2::build_http1_headers_from_headers(buf,
downstream_->get_request_headers());
if (!downstream_->get_assembled_request_cookie().empty()) {
buf->append("Cookie: ");
buf->append(downstream_->get_assembled_request_cookie());
buf->append("\r\n");
}
if (!connect_method && downstream_->get_request_http2_expect_body() &&
!downstream_->get_request_header(http2::HD_CONTENT_LENGTH)) {
downstream_->set_chunked_request(true);
buf->append("Transfer-Encoding: chunked\r\n");
}
if (downstream_->get_request_connection_close()) {
buf->append("Connection: close\r\n");
}
if (!connect_method && downstream_->get_upgrade_request()) {
auto connection = downstream_->get_request_header(http2::HD_CONNECTION);
if (connection) {
buf->append("Connection: ");
buf->append((*connection).value);
buf->append("\r\n");
}
auto upgrade = downstream_->get_request_header(http2::HD_UPGRADE);
if (upgrade) {
buf->append("Upgrade: ");
buf->append((*upgrade).value);
buf->append("\r\n");
}
}
auto xff = downstream_->get_request_header(http2::HD_X_FORWARDED_FOR);
if (get_config()->add_x_forwarded_for) {
buf->append("X-Forwarded-For: ");
if (xff && !get_config()->strip_incoming_x_forwarded_for) {
buf->append((*xff).value);
buf->append(", ");
}
buf->append(client_handler_->get_ipaddr());
buf->append("\r\n");
} else if (xff && !get_config()->strip_incoming_x_forwarded_for) {
buf->append("X-Forwarded-For: ");
buf->append((*xff).value);
buf->append("\r\n");
}
if (!get_config()->http2_proxy && !get_config()->client_proxy &&
!connect_method) {
buf->append("X-Forwarded-Proto: ");
assert(!scheme.empty());
buf->append(scheme);
buf->append("\r\n");
}
auto via = downstream_->get_request_header(http2::HD_VIA);
if (get_config()->no_via) {
if (via) {
buf->append("Via: ");
buf->append((*via).value);
buf->append("\r\n");
}
} else {
buf->append("Via: ");
if (via) {
buf->append((*via).value);
buf->append(", ");
}
buf->append(http::create_via_header_value(
downstream_->get_request_major(), downstream_->get_request_minor()));
buf->append("\r\n");
}
for (auto &p : get_config()->add_request_headers) {
buf->append(p.first);
buf->append(": ");
buf->append(p.second);
buf->append("\r\n");
}
buf->append("\r\n");
if (LOG_ENABLED(INFO)) {
std::string nhdrs;
for (auto chunk = buf->head; chunk; chunk = chunk->next) {
nhdrs.append(chunk->pos, chunk->last);
}
if (log_config()->errorlog_tty) {
nhdrs = http::colorizeHeaders(nhdrs.c_str());
}
DCLOG(INFO, this) << "HTTP request headers. stream_id="
<< downstream_->get_stream_id() << "\n" << nhdrs;
}
signal_write();
return 0;
}
int HttpDownstreamConnection::push_upload_data_chunk(const uint8_t *data,
size_t datalen) {
auto chunked = downstream_->get_chunked_request();
auto output = downstream_->get_request_buf();
if (chunked) {
auto chunk_size_hex = util::utox(datalen);
output->append(chunk_size_hex.c_str(), chunk_size_hex.size());
output->append("\r\n");
}
output->append(data, datalen);
if (chunked) {
output->append("\r\n");
}
signal_write();
return 0;
}
int HttpDownstreamConnection::end_upload_data() {
if (!downstream_->get_chunked_request()) {
return 0;
}
auto output = downstream_->get_request_buf();
auto &trailers = downstream_->get_request_trailers();
if (trailers.empty()) {
output->append("0\r\n\r\n");
} else {
output->append("0\r\n");
http2::build_http1_headers_from_headers(output, trailers);
output->append("\r\n");
}
signal_write();
return 0;
}
namespace {
void idle_readcb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Idle connection EOF";
}
auto dconn_pool = dconn->get_dconn_pool();
dconn_pool->remove_downstream_connection(dconn);
// dconn was deleted
}
} // namespace
namespace {
void idle_timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Idle connection timeout";
}
auto dconn_pool = dconn->get_dconn_pool();
dconn_pool->remove_downstream_connection(dconn);
// dconn was deleted
}
} // namespace
void HttpDownstreamConnection::detach_downstream(Downstream *downstream) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Detaching from DOWNSTREAM:" << downstream;
}
downstream_ = nullptr;
ev_set_cb(&conn_.rev, idle_readcb);
ioctrl_.force_resume_read();
conn_.rt.repeat = get_config()->downstream_idle_read_timeout;
ev_set_cb(&conn_.rt, idle_timeoutcb);
ev_timer_again(conn_.loop, &conn_.rt);
conn_.wlimit.stopw();
ev_timer_stop(conn_.loop, &conn_.wt);
}
void HttpDownstreamConnection::pause_read(IOCtrlReason reason) {
ioctrl_.pause_read(reason);
}
int HttpDownstreamConnection::resume_read(IOCtrlReason reason,
size_t consumed) {
if (!downstream_->response_buf_full()) {
ioctrl_.resume_read(reason);
}
return 0;
}
void HttpDownstreamConnection::force_resume_read() {
ioctrl_.force_resume_read();
}
namespace {
int htp_msg_begincb(http_parser *htp) {
auto downstream = static_cast<Downstream *>(htp->data);
if (downstream->get_response_state() != Downstream::INITIAL) {
return -1;
}
return 0;
}
} // namespace
namespace {
int htp_hdrs_completecb(http_parser *htp) {
auto downstream = static_cast<Downstream *>(htp->data);
auto upstream = downstream->get_upstream();
int rv;
downstream->set_response_http_status(htp->status_code);
downstream->set_response_major(htp->http_major);
downstream->set_response_minor(htp->http_minor);
if (downstream->index_response_headers() != 0) {
downstream->set_response_state(Downstream::MSG_BAD_HEADER);
return -1;
}
// Check upgrade before processing non-final response, since if
// upgrade succeeded, 101 response is treated as final in nghttpx.
downstream->check_upgrade_fulfilled();
if (downstream->get_non_final_response()) {
// Reset content-length because we reuse same Downstream for the
// next response.
downstream->set_response_content_length(-1);
// For non-final response code, we just call
// on_downstream_header_complete() without changing response
// state.
rv = upstream->on_downstream_header_complete(downstream);
if (rv != 0) {
return -1;
}
// Ignore response body for non-final response.
return 1;
}
downstream->set_response_connection_close(!http_should_keep_alive(htp));
downstream->set_response_state(Downstream::HEADER_COMPLETE);
downstream->inspect_http1_response();
if (downstream->get_upgraded()) {
// content-length must be ignored for upgraded connection.
downstream->set_response_content_length(-1);
downstream->set_response_connection_close(true);
// transfer-encoding not applied to upgraded connection
downstream->set_chunked_response(false);
}
if (upstream->on_downstream_header_complete(downstream) != 0) {
return -1;
}
if (downstream->get_upgraded()) {
// Upgrade complete, read until EOF in both ends
if (upstream->resume_read(SHRPX_NO_BUFFER, downstream, 0) != 0) {
return -1;
}
downstream->set_request_state(Downstream::HEADER_COMPLETE);
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "HTTP upgrade success. stream_id="
<< downstream->get_stream_id();
}
}
unsigned int status = downstream->get_response_http_status();
// Ignore the response body. HEAD response may contain
// Content-Length or Transfer-Encoding: chunked. Some server send
// 304 status code with nonzero Content-Length, but without response
// body. See
// https://tools.ietf.org/html/rfc7230#section-3.3
// TODO It seems that the cases other than HEAD are handled by
// http-parser. Need test.
return downstream->get_request_method() == HTTP_HEAD ||
(100 <= status && status <= 199) || status == 204 ||
status == 304
? 1
: 0;
}
} // namespace
namespace {
int htp_hdr_keycb(http_parser *htp, const char *data, size_t len) {
auto downstream = static_cast<Downstream *>(htp->data);
if (downstream->get_response_headers_sum() + len >
get_config()->header_field_buffer) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "Too large header block size="
<< downstream->get_response_headers_sum() + len;
}
return -1;
}
if (downstream->get_response_state() == Downstream::INITIAL) {
if (downstream->get_response_header_key_prev()) {
downstream->append_last_response_header_key(data, len);
} else {
if (downstream->get_response_headers().size() >=
get_config()->max_header_fields) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream)
<< "Too many header field num="
<< downstream->get_response_headers().size() + 1;
}
return -1;
}
downstream->add_response_header(std::string(data, len), "");
}
} else {
// trailer part
if (downstream->get_response_trailer_key_prev()) {
downstream->append_last_response_trailer_key(data, len);
} else {
if (downstream->get_response_headers().size() >=
get_config()->max_header_fields) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream)
<< "Too many header field num="
<< downstream->get_response_headers().size() + 1;
}
return -1;
}
downstream->add_response_trailer(std::string(data, len), "");
}
}
return 0;
}
} // namespace
namespace {
int htp_hdr_valcb(http_parser *htp, const char *data, size_t len) {
auto downstream = static_cast<Downstream *>(htp->data);
if (downstream->get_response_headers_sum() + len >
get_config()->header_field_buffer) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "Too large header block size="
<< downstream->get_response_headers_sum() + len;
}
return -1;
}
if (downstream->get_response_state() == Downstream::INITIAL) {
if (downstream->get_response_header_key_prev()) {
downstream->set_last_response_header_value(data, len);
} else {
downstream->append_last_response_header_value(data, len);
}
} else {
if (downstream->get_response_trailer_key_prev()) {
downstream->set_last_response_trailer_value(data, len);
} else {
downstream->append_last_response_trailer_value(data, len);
}
}
return 0;
}
} // namespace
namespace {
int htp_bodycb(http_parser *htp, const char *data, size_t len) {
auto downstream = static_cast<Downstream *>(htp->data);
downstream->add_response_bodylen(len);
return downstream->get_upstream()->on_downstream_body(
downstream, reinterpret_cast<const uint8_t *>(data), len, true);
}
} // namespace
namespace {
int htp_msg_completecb(http_parser *htp) {
auto downstream = static_cast<Downstream *>(htp->data);
// http-parser does not treat "200 connection established" response
// against CONNECT request, and in that case, this function is not
// called. But if HTTP Upgrade is made (e.g., WebSocket), this
// function is called, and http_parser_execute() returns just after
// that.
if (downstream->get_upgraded()) {
return 0;
}
if (downstream->get_non_final_response()) {
downstream->reset_response();
return 0;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// Block reading another response message from (broken?)
// server. This callback is not called if the connection is
// tunneled.
downstream->pause_read(SHRPX_MSG_BLOCK);
return downstream->get_upstream()->on_downstream_body_complete(downstream);
}
} // namespace
namespace {
http_parser_settings htp_hooks = {
htp_msg_begincb, // http_cb on_message_begin;
nullptr, // http_data_cb on_url;
nullptr, // http_data_cb on_status;
htp_hdr_keycb, // http_data_cb on_header_field;
htp_hdr_valcb, // http_data_cb on_header_value;
htp_hdrs_completecb, // http_cb on_headers_complete;
htp_bodycb, // http_data_cb on_body;
htp_msg_completecb // http_cb on_message_complete;
};
} // namespace
int HttpDownstreamConnection::on_read() {
if (!connected_) {
return 0;
}
ev_timer_again(conn_.loop, &conn_.rt);
std::array<uint8_t, 8_k> buf;
int rv;
if (downstream_->get_upgraded()) {
// For upgraded connection, just pass data to the upstream.
for (;;) {
auto nread = conn_.read_clear(buf.data(), buf.size());
if (nread == 0) {
return 0;
}
if (nread < 0) {
return nread;
}
rv = downstream_->get_upstream()->on_downstream_body(
downstream_, buf.data(), nread, true);
if (rv != 0) {
return rv;
}
if (downstream_->response_buf_full()) {
downstream_->pause_read(SHRPX_NO_BUFFER);
return 0;
}
}
}
for (;;) {
auto nread = conn_.read_clear(buf.data(), buf.size());
if (nread == 0) {
return 0;
}
if (nread < 0) {
return nread;
}
auto nproc =
http_parser_execute(&response_htp_, &htp_hooks,
reinterpret_cast<char *>(buf.data()), nread);
auto htperr = HTTP_PARSER_ERRNO(&response_htp_);
if (htperr != HPE_OK) {
// Handling early return (in other words, response was hijacked
// by mruby scripting).
if (downstream_->get_response_state() == Downstream::MSG_COMPLETE) {
return SHRPX_ERR_DCONN_CANCELED;
}
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "HTTP parser failure: "
<< "(" << http_errno_name(htperr) << ") "
<< http_errno_description(htperr);
}
return -1;
}
if (downstream_->response_buf_full()) {
downstream_->pause_read(SHRPX_NO_BUFFER);
return 0;
}
if (downstream_->get_upgraded()) {
if (nproc < static_cast<size_t>(nread)) {
// Data from buf.data() + nproc are for upgraded protocol.
rv = downstream_->get_upstream()->on_downstream_body(
downstream_, buf.data() + nproc, nread - nproc, true);
if (rv != 0) {
return rv;
}
if (downstream_->response_buf_full()) {
downstream_->pause_read(SHRPX_NO_BUFFER);
return 0;
}
}
// call on_read(), so that we can process data left in buffer as
// upgrade.
return on_read();
}
}
}
int HttpDownstreamConnection::on_write() {
if (!connected_) {
return 0;
}
ev_timer_again(conn_.loop, &conn_.rt);
auto upstream = downstream_->get_upstream();
auto input = downstream_->get_request_buf();
std::array<struct iovec, MAX_WR_IOVCNT> iov;
while (input->rleft() > 0) {
auto iovcnt = input->riovec(iov.data(), iov.size());
auto nwrite = conn_.writev_clear(iov.data(), iovcnt);
if (nwrite == 0) {
return 0;
}
if (nwrite < 0) {
return nwrite;
}
input->drain(nwrite);
}
conn_.wlimit.stopw();
ev_timer_stop(conn_.loop, &conn_.wt);
if (input->rleft() == 0) {
upstream->resume_read(SHRPX_NO_BUFFER, downstream_,
downstream_->get_request_datalen());
}
return 0;
}
int HttpDownstreamConnection::on_connect() {
auto connect_blocker = client_handler_->get_connect_blocker();
if (!util::check_socket_connected(conn_.fd)) {
conn_.wlimit.stopw();
if (LOG_ENABLED(INFO)) {
DLOG(INFO, this) << "downstream connect failed";
}
downstream_->set_request_state(Downstream::CONNECT_FAIL);
return -1;
}
connected_ = true;
connect_blocker->on_success();
conn_.rlimit.startw();
ev_timer_again(conn_.loop, &conn_.rt);
ev_set_cb(&conn_.wev, writecb);
return 0;
}
void HttpDownstreamConnection::on_upstream_change(Upstream *upstream) {}
void HttpDownstreamConnection::signal_write() { conn_.wlimit.startw(); }
size_t HttpDownstreamConnection::get_group() const { return group_; }
} // namespace shrpx
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