The HTTP/1.0 and 1.1 RFCs both state that header names are case-insensitive. I can't find any information on X-AcceptDeltaUpdates, but IMHO the server should probably accept the lowercase version as well.

In reply to Re^2: Difference between LWP::UserAgent and AnyEvent::HTTP by haukex
in thread Difference between LWP::UserAgent and AnyEvent::HTTP by sectokia

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