Yelp/swagger-py — pull request #65 by bpicolo (2014-11-26 00:20:14+00:00)
Title: Headers can be specified only at request time

Fixes #64

Headers aren't something that's particularly good to cache, as they don't require that HTTP call, and it can lead to especially hard to debug errors (I know because I had the issue).
This reserves the key _request_options in case we need similar things in the future.

This is backwards incompatible as it will break client instantiation that specified headers.