Hide a client request header with a Nginx reverse proxy server

Question

I have a Nginx websocket reverse proxy and I would like to hide a HTTP header from the client request.

proxy_hide_header hides the server response headers and can't be used for hiding client request headers.

I would like to do that because the websocket server behind nginx doesn't work well with the websocket extension "permessage-deflate" so I would like to remove the Sec-WebSocket-Extensions header from client requests.

Answer 1

You can set a header value to void and Nginx will drop it :

proxy_set_header       Sec-WebSocket-Extensions "";