Yeah a couple years ago I was trying to determine whether to support Content-MD5 in some HTTP software I was writing I could find nobody actually using it. The

Yeah a couple years ago I was trying to determine whether to support Content-MD5 in some HTTP software I was writing I could find nobody actually using it. There was an attempt a decade ago to make Firefox validate with it, but that died: https://bugzilla.mozilla.org/show_bug.cgi?id=232030 https://bugzilla.mozilla.org/show_bug.cgi?id=232030 Also the author is wrong that there isn't a proposed replacement -- it's the "Digest:" header (RFC 3230) although I don't think anybody uses that either.