Re: [xhr] Should XHR store and send HTTP header names in lower case? (#34)

The first, it's written directly.

Hm, it's probably only to hand-written servers that the lower-cased header names affect to.
Well-established libraries, such as standard libraries of Ruby, Go, NodeJS and Python handle header names case-insensitively, which is correct.
On plain CGI, request headers are passed as HTTP_ environment variable, and the header names are converted to upper case. So, they don't care the case of field names.

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