Send HTTP request in Unity using C#

Unity provides customizable networking capabilities that allow developers to efficiently exchange data over the Internet. This guide will provide a comprehensive overview of how to send HTTP requests in Unity using C# and UnityWebRequest (Unity's current network API), covering GET and POST operations.

GET request

GET request is used to retrieve data from the server. To send a GET request using UnityWebRequest, use the following code:

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

    if (uwr.isNetworkError)
    {
        Debug.Log("发送错误: "   uwr.error);
    }
    else
    {
        Debug.Log("接收: "   uwr.downloadHandler.text);
    }
}

POST request

POST request is used to send data to the server. You can send form data and JSON data.

POST request using form data

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("发送错误: "   uwr.error);
    }
    else
    {
        Debug.Log("接收: "   uwr.downloadHandler.text);
    }
}

POST request using JSON data

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");

    yield return uwr.SendWebRequest();

    if (uwr.isNetworkError)
    {
        Debug.Log("发送错误: "   uwr.error);
    }
    else
    {
        Debug.Log("接收: "   uwr.downloadHandler.text);
    }
}

POST request using multipart form data/multipart form files

IEnumerator PostRequest(string url)
{
    List formData = new List();
    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("发送错误: "   uwr.error);
    }
    else
    {
        Debug.Log("接收: "   uwr.downloadHandler.text);
    }
}

PUT Request

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("发送错误: "   uwr.error);
    }
    else
    {
        Debug.Log("接收: "   uwr.downloadHandler.text);
    }
}

DELETE request

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

    if (uwr.isNetworkError)
    {
        Debug.Log("发送错误: "   uwr.error);
    }
    else
    {
        Debug.Log("已删除");
    }
}