[mapserver-users] dynamic ows_serviceurl

[Paul]

hi list, this has probably been discussed before, but maybe there are updates (on v8?)
we would like to extract the ows_onlineresource from the environment, instead of having an administrator to configure it on the mapfile
currently we implement a hack where the webserver layer sends an additional query parameter `ows_url` to mapserver which contains the current url
in the mapfile this is implemented as 
```WEB
    VALIDATION
      "ows_url" "(\b(https?|ftp|file)://)?[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]"
    END
    
    METADATA
      "ows_onlineresource"               "%ows_url%"
    END
END```
I wonder if others run into similar challenges, or if there are much more simple best practices for this case.
I can imagine allowing a environment parameter 'proxy-url' like geoserver would make sense, but it should allow some kind of template, eg:
```PROXY-URL https://example.com/cgi-bin/mapserv?map={map}.map```
which in our case would be 
```PROXY-URL https://example.com/cgi-bin/{map}```
Thank you, Paul.
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