Stolen from rack: Rack::URLMap takes a hash mapping urls or paths to apps, and dispatches accordingly.
URLMap modifies the SCRIPT_NAME and PATH_INFO such that the part relevant for dispatch is in the SCRIPT_NAME, and the rest in the PATH_INFO. This should be taken care of when you need to reconstruct the URL in order to create links.
URLMap dispatches in such a way that the longest paths are tried first, since they are most specific.
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