How can I make NGINX reverse proxy conditional on HTTP header value

Question

I have reverse proxy like this:

server {
    listen 8080;

    location = /my-proxy {
      proxy_pass https://somehost/v1
    }
}

Now I would like to pass it to /v2 if HTTP request header x-version-toggle is set to v2, something like this:

server {
    listen 8080;

    location = /my-proxy {
      if ($http-x-version-toggle == 'v2') {
        proxy_pass https://somehost/v2
      }
      proxy_pass https://somehost/v1
    }
}

What is the precise syntax to achieve this?

Shrey Gupta · Accepted Answer · 2021-02-24 09:24:52Z

2

You can use map operator provided by nginx

map $http_x_version_toggle $backend {
        default http://10.41.115.241:8000/; 
        v2 http://127.0.0.1:9101/;
}

And then in the location use it as below

proxy_pass $backend

edited Feb 24, 2021 at 9:24

answered Feb 23, 2021 at 12:52

Shrey Gupta

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1 Comment

zenw0lf Over a year ago

This is incomplete, for using proxy_pass with variables you also need: stackoverflow.com/questions/5743609/…

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