Github user zwoop commented on the pull request: https://github.com/apache/trafficserver/pull/440#issuecomment-175908728 I don't think you can just change the ':' to a ';'. The ':' is what the Via: header will have, which means, you'd break compatibility. Meaning, it would no longer properly parse the input from a Via: header (I think at least). One option is to allow the separator to be either ';' or ':', such that the file names can use the ;, whereas the string in the Via: header continues to use ':'.
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