Nginx returns "upstream sent too big header while reading response header from upstream..."

November 27, 2019 171 views

What can I do about it?

1 Answer

Hi @dgiulev,

When experiencing the mentioned issue, you most probably have something very similar in your Nginx Configuration file :

server {
  listen        80;
  server_name   host;

  location / {
    proxy_pass       http://upstream;

To resolve this issue, we need to increase the proxy buffers that Nginx uses.

Before Nginx sends a response back to your visitor, it will buffer the request it had to make from its upstream. However, there are limited buffers available to buffer such a response.

To resolve this issue, you’ll need to add proxybuffersize configurations to your location block.

Your location block for proxy_pass should look something like this

  location / {
    proxy_pass       http://upstream;

    proxy_buffer_size          128k;
    proxy_buffers              4 256k;
    proxy_busy_buffers_size    256k;

The above should help you fix the error you are experiencing


Have another answer? Share your knowledge.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!