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unity自带的UnityWebRequest提供了构成 HTTP 请求和处理 HTTP 响应。

构造函数：

public UnityWebRequest();

public UnityWebRequest(Uri uri);

public UnityWebRequest(string url);

public UnityWebRequest(Uri uri, string method);

public UnityWebRequest(string url, string method);

public UnityWebRequest(string url, string method, DownloadHandler downloadHandler, UploadHandler uploadHandler);

public UnityWebRequest(Uri uri, string method, DownloadHandler downloadHandler, UploadHandler uploadHandler);

简单的例子：

using FF = StarEngineTec.Generic.FormatFunc;

string url="";//请求地址
string jsonData="";//需要上传的json数据

IEnumerator UploadPost()
{
    UnityWebRequest uwr = new UnityWebRequest(url, "POST"); 
    uwr.uploadHandler = new UploadHandlerRaw(FF.StringToBytes(jsonData));
    uwr.downloadHandler = new DownloadHandlerBuffer();

    //如果有请求头，根据具体字段要求设置
    uwr.SetRequestHeader("Content-Type", "application/json");
    uwr.SetRequestHeader("app-version", "V1");

    yield return uwr.SendWebRequest();

    if (uwr.isHttpError || uwr.isNetworkError)
    {
         Debug.LogError("Login Error: " + uwr.error);
    }
}

其他常用方法：

public static UnityWebRequest Post(Uri uri, Dictionary<string, string> formFields);

public static UnityWebRequest Post(Uri uri, WWWForm formData);

public static UnityWebRequest Post(string uri, WWWForm formData);

public static UnityWebRequest Post(Uri uri, string postData);

public static UnityWebRequest Post(string uri, string postData);

public static UnityWebRequest Post(string uri, Dictionary<string, string> formFields);

IEnumerator Upload(string str)
{
       WWWForm form = new WWWForm();
       form.AddField("data", str);

       UnityWebRequest webRequest = UnityWebRequest.Post(url, form);

       yield return webRequest.SendWebRequest();

       if (webRequest.isHttpError || webRequest.isNetworkError)
           Debug.Log(webRequest.error);
       else       
           Debug.Log(webRequest.downloadHandler.text);
}

一般上传完数据会返回条消息，可以根据code值判断成功与否，以及请求失败的原因