On Aug 30, 2006, at 11:49 PM, Steven Hedgepeth wrote:
Thanks Phil for this explaination. What resourses are available
that elaborate on what you've written?
There is a lot of detail on the internet... very easy to Google it.
Why can't a valid URL, for example, have any spaces?
Because any non-alphanumeric character [0-9a-zA-Z] except "_" or "."
are supposed to be escaped. Other characters which you see in the
URL are either control characters, or they are unsafe to use for
various reasons.
The following characters are URL control characters:
Dollar ("$")
Ampersand ("&")
Plus ("+")
Comma (",")
Forward slash ("/")
Colon (":")
Semi-colon (";")
Equals ("=")
Question mark ("?")
'At' symbol ("@")
To escape an non-alphanumeric character, you are suppose to use the
"%" symbol and add the Hexadecimal value. For example, instead of
seeing the space character in an URL, you would see it encoded with
the sequence "%20".
So you can include spaces in URLs (as long as they are encoded). Now
some browsers may accept a URL with spaces and other characters, but
these are "features" (flaws) because they will usually cause more
problems than they are worth.
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