net/textproto: skip zero-length keys
A header of ": value" results in an empty key. Do not add it to the headers, because RFC7230 (section 3.2) says that field-names are tokens, which are one or more characters. Fixes #11205. Change-Id: I883be89da1489dc84f98523786b019d1d0169d46 Reviewed-on: https://go-review.googlesource.com/11242Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org>
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