快速将以 cURL 字符串形式输出的 NSURLRequests。
用法
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"https://api.github.com/zen"]];
[request addValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setHTTPMethod:@"GET"];
NSString *curl = [request dan_curlRequest];