该WWWAPI应该得到这个工作，但UnityWebRequest取而代之，所以我会回答新的API。真的很简单。您必须使用协程通过Unity的API来执行此操作，否则必须使用C＃标准Web请求API和Thread之一。使用协程，您可以发出请求直到完成。这不会阻止主线程，也不会阻止其他脚本运行。

注意事项 ：

对于以下示例，如果您使用的是 Unity 2017.2 以下的 版本
，请替换SendWebRequest()为Send()，然后替换isNetworkError为isError。这将适用于较低版本的Unity。另外，如果您需要以二进制形式访问下载的数据，请替换uwr.downloadHandler.text为uwr.downloadHandler.data。最后，该SetRequestHeader函数用于设置请求的标头。

GET请求 ：

void Start()
{
    StartCoroutine(getRequest("http:///www.yoururl.com"));
}

IEnumerator GetRequest(string uri)
{
    UnityWebRequest uwr = UnityWebRequest.Get(uri);
    yield return uwr.SendWebRequest();

    if (uwr.isNetworkError)
    {
        Debug.Log("Error While Sending: " + uwr.error);
    }
    else
    {
        Debug.Log("Received: " + uwr.downloadHandler.text);
    }
}

带表单的POST请求 ：

void Start()
{
    StartCoroutine(postRequest("http:///www.yoururl.com"));
}

IEnumerator PostRequest(string url)
{
    WWWForm form = new WWWForm();
    form.AddField("myField", "myData");
    form.AddField("Game Name", "Mario Kart");

    UnityWebRequest uwr = UnityWebRequest.Post(url, form);
    yield return uwr.SendWebRequest();

    if (uwr.isNetworkError)
    {
        Debug.Log("Error While Sending: " + uwr.error);
    }
    else
    {
        Debug.Log("Received: " + uwr.downloadHandler.text);
    }
}

与Json的POST请求 ：

 void Start()
 {
     StartCoroutine(postRequest("http:///www.yoururl.com", "your json"));
 }

 IEnumerator PostRequest(string url, string json)
 {
     var uwr = new UnityWebRequest(url, "POST");
     byte[] jsonToSend = new System.Text.UTF8Encoding().GetBytes(json);
     uwr.uploadHandler = (UploadHandler)new UploadHandlerRaw(jsonToSend);
     uwr.downloadHandler = (DownloadHandler)new DownloadHandlerBuffer();
     uwr.SetRequestHeader("Content-Type", "application/json");

     //Send the request then wait here until it returns
     yield return uwr.SendWebRequest();

     if (uwr.isNetworkError)
     {
         Debug.Log("Error While Sending: " + uwr.error);
     }
     else
     {
         Debug.Log("Received: " + uwr.downloadHandler.text);
     }
 }

带有Multipart FormData / Multipart表单文件的POST请求 ：

void Start()
{
    StartCoroutine(postRequest("http:///www.yoururl.com"));
}

IEnumerator PostRequest(string url)
{
    List<IMultipartFormSection> formData = new List<IMultipartFormSection>();
    formData.Add(new MultipartFormDataSection("field1=foo&field2=bar"));
    formData.Add(new MultipartFormFileSection("my file data", "myfile.txt"));

    UnityWebRequest uwr = UnityWebRequest.Post(url, formData);
    yield return uwr.SendWebRequest();

    if (uwr.isNetworkError)
    {
        Debug.Log("Error While Sending: " + uwr.error);
    }
    else
    {
        Debug.Log("Received: " + uwr.downloadHandler.text);
    }
}

放置请求 ：

void Start()
{
    StartCoroutine(putRequest("http:///www.yoururl.com"));
}

IEnumerator PutRequest(string url)
{
    byte[] dataToPut = System.Text.Encoding.UTF8.GetBytes("Hello, This is a test");
    UnityWebRequest uwr = UnityWebRequest.Put(url, dataToPut);
    yield return uwr.SendWebRequest();

    if (uwr.isNetworkError)
    {
        Debug.Log("Error While Sending: " + uwr.error);
    }
    else
    {
        Debug.Log("Received: " + uwr.downloadHandler.text);
    }
}

删除请求 ：

void Start()
{
    StartCoroutine(deleteRequest("http:///www.yoururl.com"));
}

IEnumerator DeleteRequest(string url)
{
    UnityWebRequest uwr = UnityWebRequest.Delete(url);
    yield return uwr.SendWebRequest();

    if (uwr.isNetworkError)
    {
        Debug.Log("Error While Sending: " + uwr.error);
    }
    else
    {
        Debug.Log("Deleted");
    }
}