nginx 0.1.35 *) Feature: the "working_directory" directive. *) Feature: the "port_in_redirect" directive. *) Bugfix: the segmentation fault was occurred if the backend response header was in several packets; bug appeared in 0.1.29. *) Bugfix: if more than 10 servers were configured or some server did not use the "listen" directive, then the segmentation fault was occurred on the start. *) Bugfix: the segmentation fault might occur if the response was bigger than the temporary file. *) Bugfix: nginx returned the 400 response on requests like "GET http://www.domain.com/uri HTTP/1.0"; bug appeared in 0.1.28.

--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1013,6 +1013,10 @@ ngx_http_proxy_process_header(ngx_http_r
             return NGX_OK;
         }
 
+        if (rc == NGX_AGAIN) {
+            return NGX_AGAIN;
+        }
+
         /* there was error while a header line parsing */
 
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,