+(NSMutableURLRequest  *)putRequestWithUrl:(NSString *)urlString HTTPMethod:(NSString *)httpMethod HTTPBody:(NSString *)httpBody;+(NSMutableURLRequest  *)putRequestWithUrl:(NSString *)urlString HTTPMethod:(NSString *)httpMethod HTTPBody:(NSString *)httpBody{    //1.创建URL    NSURL *url = [NSURL URLWithString:urlString];        //2.创建NSURLRequest    // 注意: 如果需要设置请求体或者其他请求参数, 必须使用NSURLRequest的子类    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];        //设置模式      // 注意点: 必须大写    request.HTTPMethod = httpMethod;    //设置请求体 // 注意: 只要是POST请求, 系统内部会自动添加?    // post发送中文没有问题    request.HTTPBody = [httpBody dataUsingEncoding:NSUTF8StringEncoding];    // 设置超时时间    request.timeoutInterval = 10;    [request setValue:@"application/x-www-form-urlencoded"   forHTTPHeaderField:@"Contsetent-Type"];        return  request;        }