macournoyer/thin — pull request #133 by MasterLambaster (2012-09-10 12:20:52+00:00)
Title: Ignore Content-Length header case in response

According to the [RFC2616](http://pretty-rfc.herokuapp.com/RFC2616#message.headers)

> Each header field consists of a name followed by a colon (":") and the field value. Field names are case-insensitive.

Header spelled other than "Content-Length" prevents response to be persistent.