On Wed, 16 Oct 2013, lazypeople wrote:

> I looked up the faqs and know that the protocol part with a space will cause
> a fatal error.But i do not know why?It seems that it is meaningless for the
> space left .Why do help users filter at the left space when dealing with the
> protocol?

URLs start with a letter per definition, that's why.

Could we add code that ignores initial whitespace? Sure. But nobody has done
so.

But also... if a space is passed in as the first letter of a URL it is as sign
of something sloppy in the user end and then we actually HELP the user by not
just silently handling it. We point out that there's a problem and the user
should fix it - after all the user is passing in a string that isn't a
legitimate URL! Being very liberal in what you accept is not always helping.

-- 
  / daniel.haxx.se
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