Do not let NGINX buffer Git HTTP requests

Before this change NGINX would convert a chunked HTTP POST (e.g.
git push) into a HTTP 1.0 single large POST. This creates an
unnecessary delay, and it creates unnecessary memory pressure on
gitlab-git-http-server.

For the response ('proxy_buffering') I am less sure that NGINX 's
buffering behavior is harmful, but it still makes more sense to me
not to interfere with gitlab-git-http-server (and the Golang net/http
server).

lib/support/nginx/gitlab

@@ -124,6 +124,13 @@ server {
     proxy_connect_timeout   300;
     proxy_redirect          off;
 
+    # Do not buffer Git HTTP responses
+    proxy_buffering off;
+
+    # Pass chunked request bodies to gitlab-git-http-server as-is
+    proxy_request_buffering off;
+    proxy_http_version 1.1;
+
     proxy_set_header    Host                $http_host;
     proxy_set_header    X-Real-IP           $remote_addr;
     proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;

lib/support/nginx/gitlab-ssl

@@ -171,6 +171,13 @@ server {
     proxy_connect_timeout   300;
     proxy_redirect          off;
 
+    # Do not buffer Git HTTP responses
+    proxy_buffering off;
+
+    # Pass chunked request bodies to gitlab-git-http-server as-is
+    proxy_request_buffering off;
+    proxy_http_version 1.1;
+
     proxy_set_header    Host                $http_host;
     proxy_set_header    X-Real-IP           $remote_addr;
     proxy_set_header    X-Forwarded-Ssl     on;