Upstream: fixed tcp_nopush with gRPC.
With gRPC it is possible that a request sending is blocked due to flow
control. Moreover, further sending might be only allowed once the
backend sees all the data we've already sent. With such a backend
it is required to clear the TCP_NOPUSH socket option to make sure all
the data we've sent are actually delivered to the backend.
As such, we now clear TCP_NOPUSH in ngx_http_upstream_send_request()
also on NGX_AGAIN if c->write->ready is set. This fixes a test (which
waits for all the 64k bytes as per initial window before allowing more
bytes) with sendfile enabled when the body was written to a file
in a different context.
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 688acd8..aba1fbb 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2012,6 +2012,18 @@
return;
}
+ if (c->write->ready && c->tcp_nopush == NGX_TCP_NOPUSH_SET) {
+ if (ngx_tcp_push(c->fd) == -1) {
+ ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno,
+ ngx_tcp_push_n " failed");
+ ngx_http_upstream_finalize_request(r, u,
+ NGX_HTTP_INTERNAL_SERVER_ERROR);
+ return;
+ }
+
+ c->tcp_nopush = NGX_TCP_NOPUSH_UNSET;
+ }
+
return;
}
