Starting a directory with a + in a URL

For long and complicated reasons which I won't go into, is there any reason why you can't start a 'directory' with a +开发者_如何学JAVA ?

For example

http://stackoverflow.com/+helloworld

Note that it's not actually a directory, it's being mapped using a rewriterule

Just checking...

?

+Note : Similar to the old school tilda ~ but I don't want to use ~ because nobody knows where it is on the keyboard

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Did you try with this?

rewriterule ^\+helloworld$ /test.html

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No you can not use it to refer, in general symbol + in URL refers to whitespace: http://trprod.proofstat.com/homepages/webcatalog/cec/specs/special_c.htm