build: increase proxy buffer size

Author: erik-perri

docker/data-source-services/proxy_increase.conf

@@ -20,3 +20,7 @@ proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;
 
 # Mitigate httpoxy attack (see README for details)
 proxy_set_header Proxy "";
+
+# Increase the proxy buffer sizes to allow for larger response headers (and cookies)
+proxy_buffer_size 32k;
+proxy_buffers 4 32k;