16

I have an nginx-based HTTP proxy and I would like to process all HTTP redirects inside it so that clients get only the last response in the redirect chain.

The basic code looks like:

location /proxy {
    rewrite ^/proxy/([^/]+) $1 break;

    proxy_pass http://$uri/;
}

My attempt at following 1 level redirects is this:

error_page 301 302 307 =200 @redir;

... and having this named location:

location @redir {
    proxy_pass $proxy_location;
}

Only there's no $proxy_location variable and I failed to find a way of creating it. It should contain the value of Location: header received from upstream.

Any thoughts?

7

I believe you want the variable $upstream_http_location.

Variables that begin with $proxy* control what goes from nginx to the upstream. The $upstream* series of variables contains information about the response that nginx itself receives. You can get any aribitrary HTTP header received from an upstream server with $upstream_http_headername.

Note that these $upstream variables cannot be anything but null until the response is received from the upstream server, so there are some limitations on their use.

| improve this answer | |
  • by the rules of stack overflow you should not provide links, which may change in the future. instead you should provide precise working example. I don't know why this incomplete answer was selected but it is not helpful by the stackoveflow standard. vlad's answer is much more helpful. – vasilevich Oct 23 at 0:41
27

Here is the full example of what worked for me:

server {
    ...

    location / {
        proxy_pass http://backend;
        # You may need to uncomment the following line if your redirects are relative, e.g. /foo/bar
        #proxy_redirect / /;
        proxy_intercept_errors on;
        error_page 301 302 307 = @handle_redirect;
    }

    location @handle_redirect {
        set $saved_redirect_location '$upstream_http_location';
        proxy_pass $saved_redirect_location;
    }
}
| improve this answer | |
  • 1
    Why did you have to save the value of $upstream_http_location in a new variable? – Parth Shah Nov 10 '18 at 1:04
  • 1
    I don't know the exact reason, but it doesn't work otherwise... – Vlad Frolov Nov 10 '18 at 7:09
  • This is great but only catches a single redirect. Any way to handle multiple redirects? – ThiefMaster Oct 18 '19 at 13:17
  • 1
    @ThiefMaster I believe this answer is what you're looking for. – iBug Oct 24 '19 at 17:11
  • I'm getting the following error 2020/01/23 09:17:46 [error] 1394#0: *1 invalid URL prefix in "", client: xx.xx.28.3, server: www.example.com, request: "GET /test HTTP/1.1", host: "www.example.com" using the @handle_redirect block, any idea ? – Cyril Duchon-Doris Jan 23 at 9:18

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