Support for header families

Very recently i came across a certain limitation of typed-api, as title suggests it is about header families, for example all headers starting with l5d-ctx (linkerd context). Program may not be interested to use all of the headers of that family but it might be required to forward those when doing request to some other service. Unfortunately it is impossible to do this given the current API, but i think it should be pretty simple to add something like the following:

  val MyApi = "header" :> "family" :> Header[String].family("my-hdr-family") :> Get[Json, A]

Given the following definition one can interpret it as to extract all headers starting with my-hdr-family on the server-side, and to provide zero or more headers on the client side.

[pheymann]

Btw. 0.1.0 is released and includes the matching (family) headers.

[pheymann]

👍