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TIL <a href="https://ruby-doc.org/stdlib-2.4.2/libdoc/net/http/rdoc/Net/HTTP.html">Net::HTTP</a> custom headers are downcased. I also learned that the RFC specify header keys are <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2" rel="nofollow noreferrer">case-insensitive</a>.<p>#note </p>