[a1369209993]

Speaking of broken links, you're also returning 404 for HEAD requests:

  $ youtube-dl https://www.pointfree.co/episodes/ep185-tour-of-parser-printers-introduction -f http-720p
  [generic] ep185-tour-of-parser-printers-introduction: Requesting header
  [snip]
  zlib.error: Error -5 while decompressing data: incomplete or truncated stream
  $ wget --method=HEAD https://www.pointfree.co/episodes/ep185-tour-of-parser-printers-introduction
  [snip]
  HTTP request sent, awaiting response... 404 Not Found

(Fixed youtube-dl by diking out head_response (with `= False`) in youtube_dl/extractor/generic.py:2408 if anyone else cares.)