Nginx passing url arguments as header

Question

In the following example:

http {                                                                        
        server { # simple reverse-proxy                                       
        listen       8080;                                                    
            location / {                                                      
                set $token $arg_token;                                        
                #return 200 $token;                                           
                add_header test "test $token";                                
                proxy_pass http://localhost:5601;                             
            }                                                                 
        } ...
}

if I leave return 200 $token I obtain the token as response + in header (which is a normal behavior) but when I delete return I obtain only "test" as test header value, what am I missing please ?

Danila Vershinin · Accepted Answer · 2019-08-18 18:28:18Z

1

The proxy_set_header sets header that NGINX will use while communicating to the upstream/backend.

You won't see that added header in the response of NGINX back to the client.

If you want to see it, use add_header as well.

answered Aug 18, 2019 at 18:28

Danila Vershinin

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6 Comments

hereForLearing Over a year ago

Thank you for your answer, I've given the wrong example please check my edited question, thank you!

Danila Vershinin Over a year ago

What is the HTTP status when you don't add return? If you app returns non-200 response, then add_header will not apply, unless you add always parameter to it.

Danila Vershinin Over a year ago

What happens if you just use add_header test "test $arg_token"; without set? Your issue might be an order of application for set + add_header + proxy_pass.

hereForLearing Over a year ago

the problem is that the test is present it's just the $arg_token (or $token) that doesn't has value I don't understand why, I have test header = "test" without the token

hereForLearing Over a year ago

ok that's really weird but it seems that the problem is from kibana, if I try another proxy_pass it works... :(

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