Path parameter

[malud]

Supporting user defined path parameter in couper is crucial. An example would look like this:

endpoint "/my/{category}/{sub}/list" {
    backend {
        path = "/cms/${req.path_param.category}/order/${req.path_param.sub}/list"
        # or
        request_headers {
            x-cat: req.path_param.category
            x-sub-cat: req.path_param.sub
        }
    }
}

Since some other packages has already solved some related details we would like to use this pathpattern module. This could be handy in combination with our openapi validation poc #21 later on.

So the main task is to replace our current http multiplexer and routing which additionally will simplify some implementation details.