FakeWSResponseHeaders

The names of the product elements

The name of the type

Transition the response headers from

Map[String, String]

to

Map[String, Seq[String]]

.

The closest behavior to the real WSClient implementations is wrap each value in a Seq() of size 1.

Justification: Multiple header response values for a single key are legal per RFC 2616 4.2 in two forms.

1. Comma separated (e.g. Cache-Control: no-store, no-cache) NingWSClient represents these as Map("Cache-Control" -> Seq("no-store, no-cache")) rather than splitting them, so we shall too.

2. Split into header key-value pairs (e.g. Cache-Control: no-store, Cache-Control: no-cache) Play 2.3 has a bug and is incapable of producing this response, so we don't have to worry about it. TL;DR: play.api.mvc.ResponseHeader uses a Map[String, String] which doesn't allow key collisions.

See: https://github.com/playframework/playframework/issues/3544