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da138456a6
When a file upload ends in \r\n (i.e. a Windows formatted text file) the sequence of bytes on the wire is `\r\n\r\n----...boundary-marker...`. When the FSM in Webserver was evaluating the stream, that 2nd `\r` would be written as valid data and the FSM parser would be reset and see `\n` as the 1st character, which wouldn't match. This would a) add an extra `\r` to uploaded files, and b) cause uploads to hang. Fix by checking on a header FSM mismatch if the next character input could possibly match our marker, and if so handle it properly. Fixes #7803