[PATCH] Correctly flush request body to uwsgi with SSL

[Quantum]

# HG changeset patch
# User Quantum <quantum2048 at gmail.com>
# Date 1592256926 14400
#      Mon Jun 15 17:35:26 2020 -0400
# Node ID eff63a5758aaca39545fd81bb646194987ae0ee3
# Parent  d127837c714f398e04cc8cf26f922c845fb7a6e8
Correctly flush request body to uwsgi with SSL

The flush flag was not set when forwarding the request body to the uwsgi
server. When using uwsgi_pass suwsgi://..., this causes the uwsgi server
to wait indefinitely for the request body and eventually time out due to
SSL buffering.

This is essentially the same change as 4009:3183165283cc, which was made
to ngx_http_proxy_module.c.

This will fix the uwsgi bug https://github.com/unbit/uwsgi/issues/1490.

diff -r d127837c714f -r eff63a5758aa src/http/modules/ngx_http_uwsgi_module.c
--- a/src/http/modules/ngx_http_uwsgi_module.c	Mon Jun 08 11:40:34 2020 +0300
+++ b/src/http/modules/ngx_http_uwsgi_module.c	Mon Jun 15 17:35:26 2020 -0400
@@ -1141,6 +1141,7 @@
         r->upstream->request_bufs = cl;
     }
 
+    b->flush = 1;
     cl->next = NULL;
 
     return NGX_OK;