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MEDIUM: http: do not report connection errors for second and further requests

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In HTTP keep-alive, if we face a connection error to the server while sending
the request, the error should not be reported, and the client-side connection
should simply be closed, so that client knows it can retry. This can happen if
the server has too short a keep-alive timeout and quits at the same moment the
new request comes in.
This commit is contained in:
Willy Tarreau 2013-12-15 19:31:37 +01:00
parent 9420b1271d
commit 6b726adb35
1 changed files with 34 additions and 4 deletions

38
src/proto_http.c
View File

@ -913,6 +913,8 @@ void http_perform_server_redirect(struct session *s, struct stream_interface *si
* logs might explain incomplete retries. All others should avoid
* being cumulated. It should normally not be possible to have multiple
* aborts at once, but just in case, the first one in sequence is reported.
* Note that connection errors appearing on the second request of a keep-alive
* connection are not reported since this allows the client to retry.
*/
void http_return_srv_error(struct session *s, struct stream_interface *si)
{
@ -923,7 +925,8 @@ void http_return_srv_error(struct session *s, struct stream_interface *si)
503, http_error_message(s, HTTP_ERR_503));
else if (err_type & SI_ET_CONN_ABRT)
http_server_error(s, si, SN_ERR_CLICL, SN_FINST_C,
503, http_error_message(s, HTTP_ERR_503));
503, (s->txn.flags & TX_NOT_FIRST) ? NULL :
http_error_message(s, HTTP_ERR_503));
else if (err_type & SI_ET_QUEUE_TO)
http_server_error(s, si, SN_ERR_SRVTO, SN_FINST_Q,
503, http_error_message(s, HTTP_ERR_503));
@ -932,13 +935,16 @@ void http_return_srv_error(struct session *s, struct stream_interface *si)
503, http_error_message(s, HTTP_ERR_503));
else if (err_type & SI_ET_CONN_TO)
http_server_error(s, si, SN_ERR_SRVTO, SN_FINST_C,
503, http_error_message(s, HTTP_ERR_503));
503, (s->txn.flags & TX_NOT_FIRST) ? NULL :
http_error_message(s, HTTP_ERR_503));
else if (err_type & SI_ET_CONN_ERR)
http_server_error(s, si, SN_ERR_SRVCL, SN_FINST_C,
503, http_error_message(s, HTTP_ERR_503));
503, (s->txn.flags & TX_NOT_FIRST) ? NULL :
http_error_message(s, HTTP_ERR_503));
else if (err_type & SI_ET_CONN_RES)
http_server_error(s, si, SN_ERR_RESOURCE, SN_FINST_C,
503, http_error_message(s, HTTP_ERR_503));
503, (s->txn.flags & TX_NOT_FIRST) ? NULL :
http_error_message(s, HTTP_ERR_503));
else /* SI_ET_CONN_OTHER and others */
http_server_error(s, si, SN_ERR_INTERNAL, SN_FINST_C,
500, http_error_message(s, HTTP_ERR_500));
@ -5136,6 +5142,8 @@ int http_wait_for_response(struct session *s, struct channel *rep, int an_bit)
else if (rep->flags & CF_READ_ERROR) {
if (msg->err_pos >= 0)
http_capture_bad_message(&s->be->invalid_rep, s, msg, msg->msg_state, s->fe);
else if (txn->flags & TX_NOT_FIRST)
goto abort_keep_alive;
s->be->be_counters.failed_resp++;
if (objt_server(s->target)) {
@ -5161,6 +5169,8 @@ int http_wait_for_response(struct session *s, struct channel *rep, int an_bit)
else if (rep->flags & CF_READ_TIMEOUT) {
if (msg->err_pos >= 0)
http_capture_bad_message(&s->be->invalid_rep, s, msg, msg->msg_state, s->fe);
else if (txn->flags & TX_NOT_FIRST)
goto abort_keep_alive;
s->be->be_counters.failed_resp++;
if (objt_server(s->target)) {
@ -5209,6 +5219,8 @@ int http_wait_for_response(struct session *s, struct channel *rep, int an_bit)
else if (rep->flags & CF_SHUTR) {
if (msg->msg_state >= HTTP_MSG_RPVER || msg->err_pos >= 0)
http_capture_bad_message(&s->be->invalid_rep, s, msg, msg->msg_state, s->fe);
else if (txn->flags & TX_NOT_FIRST)
goto abort_keep_alive;
s->be->be_counters.failed_resp++;
if (objt_server(s->target)) {
@ -5234,6 +5246,8 @@ int http_wait_for_response(struct session *s, struct channel *rep, int an_bit)
else if (rep->flags & CF_WRITE_ERROR) {
if (msg->err_pos >= 0)
http_capture_bad_message(&s->be->invalid_rep, s, msg, msg->msg_state, s->fe);
else if (txn->flags & TX_NOT_FIRST)
goto abort_keep_alive;
s->be->be_counters.failed_resp++;
rep->analysers = 0;
@ -5451,6 +5465,22 @@ skip_content_length:
rep->analyse_exp = TICK_ETERNITY;
channel_auto_close(rep);
return 1;
abort_keep_alive:
/* A keep-alive request to the server failed on a network error.
* The client is required to retry. We need to close without returning
* any other information so that the client retries.
*/
txn->status = 0;
rep->analysers = 0;
s->req->analysers = 0;
channel_auto_close(rep);
s->logs.logwait = 0;
s->logs.level = 0;
s->rep->flags &= ~CF_EXPECT_MORE; /* speed up sending a previous response */
bi_erase(rep);
stream_int_retnclose(rep->cons, NULL);
return 0;
}
/* This function performs all the processing enabled for the current response.