ServiceStack/ServiceStack — pull request #495 by captncraig (2013-02-26 21:46:37+00:00)
Title: Adding Header collection to ServiceClientBase

This old forum post details a need for attaching custom http headers to an outgoing request:

https://groups.google.com/forum/?fromgroups=#!topic/servicestack/VJzJafUvgfY

As that thread seems to have been abandoned, I implemented a headers collection on `ServiceClientBase` and added some integration tests.