Unity WebGL HTTP Request without IEnumerator or Coroutine

Question

As the title tells I'm trying to make a HTTP Request in Unity (WebGL).

In the documentation I found here: WebGL Networking they tell me to create a IEnumerator type function and call it via a StartCoroutine call.

This is all fine, my problem is that I need to provide a callback HttpRequest to a class that is in another library.

My callback looks like this:

private string HttpRequest(string url, string method, string body=null) {

    WWW www = null; // = null is compiler candy

    if (method == "GET") {
        www = new WWW(url);
    } else if (method == "POST") {
        //POST specific implementation...
    } else {
       // do something else
    }

    while (!www.isDone) { } // this is Wrong.
    return www.text;
}

The problem is that unless I return from HttpRequest and the calling method JavaScript won't be able to handle the request. But on the other hand the calling method expects a string not some kind of IEnumerator.

Is there some workaround to let JavaScript do it's work after the WWW class has been constructed?

Answer 1

No

WWW and UnityWebRequest are asynchronous.

To do a synchronous request you need write a javascript plugin. By using some library it's not very complicated, such as jquery.

function getdata($url, $method, $data)
{
    var text = '';

    $.ajax({
        url: $url,
        type: $method,
        async: false, //synchronous request
        data: $data,
        success: function(data){
            text = data;
        },
        error: function(data){
            text = data;
        }
    });

    return text;
}

More information:

Communication between javascript and unity

jquery.ajax