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It should not be case sensitive, as stated in http://www.ietf.org/rfc/rfc2616.txt "Each header field consists of a name followed by a colon (":") and the field value. Field names are case-insensitive." This can lead to taking bad assumptions on HTTP server responses/capabilities.
fixed by commit 34bcd0edd070e8d7ddefd41e2680acb23ed7337b