nginx proxy_pass based on whether request method is POST, PUT or DELETE

Question

I have two iKaaro instances running on port 8080 and 9080, where the 9080 instance is Read only.

I am unsure how to use nginx for example if the request method is PO

Answer 1

I'd recommend the nginx map function. This goes outside of your location block:

map $request_method $destination {
    default 8080;
    PUT 9080;
    POST 9080;
    DELETE 9080;
}

Then in your location block:

proxy_pass http://127.0.0.1:$destination

This is all regexes too, so you can do things like:

map $request_method $cookie_auth $destination {
    default 8080;
    "^POST " 9080;
    "^PUT someAuthCookieValue" 9080;
}

Plus this avoids the use of if at all. It's pretty awesome. I used it to direct all write traffic in a WordPress cluster to one FastCGI TCP socket on a remote node but send read traffic to a local FastCGI UNIX socket.