forward matched specific location and proxy redirect it in nginx

Question

I am trying to forward specific uri if matched to backend in nginx. For example

forward https://www.hostname.com/*/a/b/c to https://int.hostname.com/*/a/b/c (Where * is a variable auto populated from regex)

Current configuration looks like below and have no idea how to proceed on above

location /a/b/c/ {
    proxy_set_header        Host $proxy_host;
    proxy_set_header        X-Forwarded-Proto $scheme;
    proxy_set_header        X-Real-IP $remote_addr;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_read_timeout      180m;

    proxy_pass http://int.hostname.com/v2/e/t/a/b/c;
    proxy_redirect default;
}

To clarify, in the case where the uri matches "/*/a/b/c" are you sending to the same path on the internal server, or is there some modification? e.g. if someone hits /v1/a/b/c are you just talking to /v1/a/b/c on internal? or is the "/v1" part somehow important — Joshua DeWald
– Joshua DeWald, Commented Jul 27, 2017 at 5:40
@JoshuaDeWald It will be same. /v1/a/b/c will be pass to backed as /v1/a/b/c. Similarly, /sample/v2/a/b/c will be passed as /sample/v2/a/b/c. * means any path. Thanks — Prakash
– Prakash, Commented Jul 27, 2017 at 5:47

Richard Smith · Accepted Answer · 2017-07-27 08:18:00Z

1

If you want your location to match any URI that ends with /a/b/c/, you will need to use regular expression syntax. See this document for details.

The URI suffix of the proxy_pass statement is optional. In the absence of a URI suffix, the original URI will be passed unmodified. See this document for details.

For example:

location ~ /a/b/c/$ {
    ...
    proxy_pass http://int.hostname.com;
    ...
}

answered Jul 27, 2017 at 8:18

Richard Smith

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3 Comments

Prakash Over a year ago

Thanks I will take a look at those docs. You mean I do need to write anything in proxy_pass? Actually, URI may not end with /a/b/c/. Considering this, what should be done if it doesn't end with it?

Richard Smith Over a year ago

You mean that /a/b/c/ is embedded anywhere inside the URI? In which case, remove the terminating $.

Prakash Over a year ago

yeah, that's the case and it should also forward exactly same to backend. If URI doesn't content /a/b/c/ then it shouldn't forward URI to backend. I hope this works. If there is anything else that I should take care of please let me know. I will test it.

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