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NSString* urlEncode(NSString * url)
{
    string inStr = StringFromNSString(url);
    CFStringRef inStringRef = CFStringCreateWithCString( kCFAllocatorDefault, inStr.c_str(), kCFStringEncodingUTF8 );
    NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)inStringRef,NULL,(CFStringRef)@"!*’();:@&=+$,/?%#[]",kCFStringEncodingUTF8 );
    return encodedString;
}

<body>
    <div id="content">
        <h1>An Error Was Encountered</h1>
        <p>The URI you submitted has disallowed characters.</p> </div>
</body>
</html>
terminate called after throwing an instance of 'std::invalid_argument'
  what():

-(NSString*) urlEncode
{
    NSString *encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes( NULL, (CFStringRef)self, NULL, (CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8 );
    return [encodedString autorelease];
}

- (NSString *)encodedURLParameterString {
    NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                                       (CFStringRef)self,
                                                                       NULL,
                                                                       CFSTR(":/=,!$& '()*+;[]@#?"),
                                                                       kCFStringEncodingUTF8);
    return [result autorelease];
 }

scheme://host/path?<key>=<value>&<key>=<value>

NSString *encodedstring = (__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(NULL,
                                                                                          (__bridge CFStringRef)yoururlstring,
                                                                                          NULL,
                                                                                       (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                                                       kCFStringEncodingUTF8);