URL placeholders with slash impossible / Add support for path variables

[netmikey]

The current documented way of using path variables is as follows:

resp = twitter.delete( path: "destroy/${postID}.json" )

But what if the postID wasn't numeric and contained a forward slash? The URL would end up being something like destroy/mypost/4711.json whereas what we expected was destroy/mypost%2F4711.json. If we try to encode the parameter manually while concatenating the string, we end up with a double-escaped slash: destroy/mypost%252F4711.json. As of now, there doesn't seem to be any way to transmit a single encoded slash in the URL.

A good solution would be introducing path variables, like in Spring MVC. That could look something like this:

    resp = twitter.delete( path: 'destroy/{postID}.json', pathVariables: [postID: 'mypost/4711'] )

This could be escaped and used exactly as the query map in URIBuilder.