gistfile1.txt

//MGTwitterEngine
- (NSString *)_encodeString:(NSString *)string
{
    NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, 
                                                                 (CFStringRef)string, 
                                                                 NULL, 
                                                                 (CFStringRef)@";/?:@&=$+{}<>,",
                                                                 kCFStringEncodingUTF8);
    return [result autorelease];
}

//My Code
- (NSString *) URLEncodedString: (NSString *) string {

	NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, 
																		   (CFStringRef)string, 
																		   NULL, 
																		   (CFStringRef)@"!;/?:@&=$+{}<>,",
																		   kCFStringEncodingUTF8);
	
    return [result autorelease];
}