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Are there still characters you should not have in your url?
ie + or -
[edited by: encyclo at 11:42 pm (utc) on Sep. 7, 2007]
[edit reason] switched to example.com [/edit]
The "unreserved" characters are generally "safe" to use:
2.3. Unreserved Characters
Data characters that are allowed in a URI but do not have a reserved
purpose are called unreserved. These include upper and lower case
letters, decimal digits, and a limited set of punctuation marks and
unreserved = alphanum ¦ mark
mark = "-" ¦ "_" ¦ "." ¦ "!" ¦ "~" ¦ "*" ¦ "'" ¦ "(" ¦ ")"
Unreserved characters can be escaped without changing the semantics
of the URI, but this should not be done unless the URI is being used
in a context that does not allow the unescaped character to appear.
[added] Use of other characters is not "illegal" per se, but the client and the server will send them as escaped hex-encoded entities. For example, a space is sent as "%20" -- which looks awful in the browser address bar, is very difficult to remember and to type, and should therefore be avoided. [/added]
[edited by: jdMorgan at 10:19 pm (utc) on Sep. 7, 2007]
If a "+" is included in the URL, it will be encoded as "%2b". This encoded character will appear in the browser address bar and in search engine listings.
If a "+" is included in the query-string, it will pass through unchanged.
As an experiment, try making a test page with links including these characters to see how they behave.