GET /path/to/file.ext HTTP/1.1
    TE: deflate,gzip;q=0.3
    Connection: TE, close
    Authorization: Basic YW5vbnltb3VzOkZpbGUtRmV0Y2hAZXhhbXBsZS5jb20=
    From: File-Fetch@example.com
    Host: my.domain.com
    If-Modified-Since: Wed, 07 Jun 2017 03:40:39 GMT
    User-Agent: File::Fetch/0.48