Pylons/webob — pull request #48 by mpirnat (2012-05-15 18:02:16+00:00)
Title: Adds HTTP exception classes for RFC 6585

I was in the midst of implementing rate limiting and needed a "429: Too Many Requests" exception. While I was there, it seemed polite to create exception classes for the other responses outlined in RFC 6585, so this has:

* 428: Precondition Required
* 429: Too Many Requests
* 431: Request Header Fields Too Large
* 511: Network Authentication Required