post方法如何仅发送必需的参数objective-c

// 创建URL对象
NSURL *url = [NSURL URLWithString:@"http://example.com/api"];

// 创建请求对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];

// 设置请求参数
NSString *params = @"key1=value1&key2=value2";
NSData *postData = [params dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:postData];

// 发送请求
NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    if (error) {
        NSLog(@"请求失败：%@", error);
    } else {
        // 处理响应数据
        NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        NSLog(@"请求成功：%@", result);
    }
}];
[task resume];