Question about character of NSString invalid in URL on iPhone

Question

Some of my http request has \'space\' in URL, but it is not recognized by iPhone. I have to change \'space\' to \'%20\' whenever there is a \'space\' in the url. Now I have

Answer 1

See RFC 2396 for the full gory details. The following characters must be escaped:

Control characters (ASCII 00-1F and 7F)
Space
<
>
#
%
"

The following characters are unwise to use without escaping because some gateways and other transport agents are known to sometimes modify such characters, or they are used as delimiters:

{ } | \ ^ [ ] `

Answer 2

I think this is a better approach:

NSString* escapedUrl = [originalUrl   
stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

If you want to understand how URL encoding works, take a look at this URL.