Request body: unbuffered reading. The r->request_body_no_buffering flag was introduced. It instructs client request body reading code to avoid reading the whole body, and to call post_handler early instead. The caller should use the ngx_http_read_unbuffered_request_body() function to read remaining parts of the body. Upstream module is now able to use this mode, if configured with the proxy_request_buffering directive.

--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -2525,6 +2525,11 @@ ngx_http_finalize_connection(ngx_http_re
         return;
     }
 
+    if (r->reading_body) {
+        r->keepalive = 0;
+        r->lingering_close = 1;
+    }
+
     if (!ngx_terminate
          && !ngx_exiting
          && r->keepalive