Shield::Middleware doesn't play well when app is on a sub URI

[LichP]

Shield::Middleware expects the supplied url to be absolute. This makes life difficult when the app is on a sub uri as the url is passed in class context, and there doesn't seem to be any mechanism for determining the sub uri the app is mounted on at that point. Is there an alternative to simply passing in e.g. '/suburi/login', or could Shield::Middleware#headers prefix env["SCRIPT_NAME"] to url to get round this?

[cyx]

One possible solution is to accept a lambda which takes the env as the parameter, that way it will be more generic.

The resulting app code will be longer, but I think it would be fine.

Something like:

    use Shield::Middleware, lambda { |env| env["SCRIPT_NAME"] + "/login" }

The alternative is a specialized solution for just script name:

   use Shield::Middleware, "/login", mounted: true

s/mounted/something better (just throwing it out there)

[LichP]

I'd lean towards the lambda solution as being the most flexible. Is their any harm in doing env["SCRIPT_NAME"] + url by default though? When app is mounted on root, ``env["SCRIPT_NAME"]` should be empty anyway , I believe.