Hi!

The URL parser in libcurl accepts URLs without a scheme, the "text://" part of
URLs.

If no scheme is specified, libcurl guesses which scheme that was intended
based on some basic hueristics and if nothing matches it falls back to plain
old "http://".

In this day and age of growing HTTPS use and slow decay of plain HTTP, maybe
it is time to change the fallback in libcurl and make it instead go with HTTPS
if nothing else matches?

I'm a little scared this might hurt a lot of users running scripts relying on
this since forever.

(Brought to attention since I'm adding the CURLU_GUESS_SCHEME to the URL API
in https://github.com/curl/curl/pull/3018)

Thoughts?

-- 
  / daniel.haxx.se
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