Issue with encoding “&” in URLs

Question

I\'ve got to send a https GET request to a web service in my iPhone app which is developing in Swift 1.2.

I am trying to construct query string parameters but got to

Answer 1

I used such an utility method to URL-encode values in GET-requests:

@interface NSString (Ext)

@property (nonatomic, readonly) NSString *urlEncoded;

@end

@implementation NSString (Ext)

- (NSString *)urlEncoded {
    NSMutableCharacterSet *const allowedCharacterSet = [NSCharacterSet URLQueryAllowedCharacterSet].mutableCopy;
    // See https://en.wikipedia.org/wiki/Percent-encoding
    [allowedCharacterSet removeCharactersInString:@"!*'();:@&=+$,/?#[]"]; // RFC 3986 section 2.2 Reserved Characters (January 2005)
    NSString *const urlEncoded = [self stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacterSet];
    return urlEncoded;
}

@end