How to Make HTTP GET and POST Requests in Unity using C#?

Using C# to make HTTP requests in Unity

When developing games or interactive applications in Unity, the ability to send HTTP requests is critical for tasks such as user authentication, getting data from web services, and submitting game events. This article demonstrates how to send HTTP GET and POST requests using C# in Unity to meet the requirements specified in the question.

UnityWebRequest: Request and response handling

UnityWebRequest provides a convenient and efficient way to make web requests in Unity. It handles coroutines and multi-threading internally, makes asynchronous requests and prevents UI freezing.

GET request

To send a GET request, just call UnityWebRequest.Get() and pass in the URI. The response text can be accessed via uwr.downloadHandler.text.

<code class="language-csharp">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);
}</code>

POST request containing form data

To send a POST request containing form data, build the form using WWWForm and pass it to UnityWebRequest.Post().

<code class="language-csharp">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);
}</code>

JSON POST request

For JSON POST requests, create a raw upload handler and manually set the Content-Type header to application/json.

<code class="language-csharp">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);
}</code>

PUT, DELETE and Multipart/Form-Data

UnityWebRequest also supports PUT, DELETE and multipart/form-data requests. See the provided code snippet for a detailed example.

By following these code examples, you can quickly send and handle HTTP requests in your Unity game or application, giving you powerful tools for seamless data exchange.

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