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// create parameter string from parameter dictionary | |
__block NSMutableString *parameterString; | |
[parameters enumerateKeysAndObjectsUsingBlock:^(id key, id value, BOOL *stop) { | |
if (!parameterString) parameterString = [NSMutableString stringWithString:@"?"]; | |
else [parameterString appendString:@"&"]; | |
// escape value string | |
NSString *escapedString = (__bridge NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)[parameters valueForKey:key], NULL, CFSTR(":/?#[]@!$&’()*+,;="), kCFStringEncodingUTF8); | |
[parameterString appendFormat:@"%@=%@", key, escapedString]; | |
}]; |