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### URLByAppendingPathComponent vs URLByAppendingPathExtension NSURL *originalURL = [NSURL URLWithString:@"http://hello.com/news"]; NSLog(@"%@", [originalURL URLByAppendingPathComponent:@"local"]); NSLog(@"%@", [originalURL URLByAppendingPathExtension:@"local"]); Output:

http://hello.com/news/local http://hello.com/news.local