Allow path prefix to be configured

[mojodna]

When running behind a reverse proxy, endpoints may be prefixed (e.g. /tiles/). Tegola should have the ability to provide an alternate path prefix to match the proxied prefix when it doesn't match Tegola's default (/).

(As both an option in the config TOML and as a command line arg.)

[ARolek]

how is this usually handled? It seems to me the proxy should drop the prefix rather than push the responsibility to tegola.

[mojodna]

The proxy does drop the prefix, so the app is fully unaware of it (it sees / where the client requested /). I know Apache can be configured to rewrite URLs on the way out, but rewriting responses is something I'd rather stay away from.

The need is for URL generation, not handling.

[ARolek]

You're talking about the URLs returned by the capabilities endpoint?

[mojodna]

Yes.

[ARolek]

tegola supports a config var of hostname which could be used for this requirement, though that's not the most elegant solution it would work near term.

[ARolek]

After discussing this with @mojodna we can accomplish this by supporting the query string uriprefix on the /capabilites/ endpoints.