UnityWebRequest 通过Post方式发起网络请求

以实际工作中与后端人员对接接口为例，下图为后端人员提供的需要对接的某个接口：    

可见数据结构中包含了4个string类型的字段，首先定义数据结构，注意字段名和字段类型需要保持一致，否则导致无法正确解析数据。

/// 
/// 确认过闸
/// 
[Serializable]
public class Affirm
{
    public string id;
    public string inId;
    public string time;
    public string batchCode;
}

Serializable特性表示该类可序列化，否则无法进行序列化

    设置请求头header的Content-Type，它有四种类型：

        application/x-www-form-urlencoded（默认）  

        application/xml

        application/json

        multipart/form-data

由于该接口所传的参数为json格式，所以需要设置为application/json，否则导致报错：HTTP/1.1 415 Unsupported Media Type，下面封装发起网络请求的携程函数：

public IEnumerator SendWebRequest()
{
    //接口地址
    string url = "http://**.**.***.***:****/********/*****";
    //post数据 通过序列化获得字符串
    string postData = JsonMapper.ToJson(new Affirm());
    //Post网络请求
    using (UnityWebRequest request = UnityWebRequest.Post(url, UnityWebRequest.kHttpVerbPOST))
    {
        byte[] postBytes = Encoding.UTF8.GetBytes(postData);
        request.uploadHandler = new UploadHandlerRaw(postBytes);
        request.downloadHandler = new DownloadHandlerBuffer();
        request.SetRequestHeader("Content-Type", "application/json");
        yield return request.SendWebRequest();
        if (!request.isNetworkError && !request.isHttpError)
        {
            Debug.Log(response);
        }
        else
        {
            Debug.LogError($"发起网络请求失败： 确认过闸接口 -{request.error}");
        }
    }
}

当后端返回数据时，通过反序列化得到我们所需的Response类

[Serializable]
public class AffirmResponse
{
    public string msg;
    public int code;
    public bool hit;
    public List data;
}

public IEnumerator SendWebRequest()
{
    //接口地址
    string url = "http://**.**.***.***:****/********/*****";
    //post数据 通过序列化获得字符串
    string postData = JsonMapper.ToJson(new Affirm());
    //Post网络请求
    using (UnityWebRequest request = UnityWebRequest.Post(url, UnityWebRequest.kHttpVerbPOST))
    {
        byte[] postBytes = Encoding.UTF8.GetBytes(postData);
        request.uploadHandler = new UploadHandlerRaw(postBytes);
        request.downloadHandler = new DownloadHandlerBuffer();
        request.SetRequestHeader("Content-Type", "application/json");
        yield return request.SendWebRequest();
        if (!request.isNetworkError && !request.isHttpError)
        {
            //反序列化
            var response = JsonMapper.ToObject(request.downloadHandler.text);
            Debug.Log($"Code:{response.code}  Msg:{response.msg}  Hit:{response.hit}");
        }
        else
        {
            Debug.LogError($"发起网络请求失败： 确认过闸接口 -{request.error}");
        }
    }
}