c# - Unity: POST request using WWW class using JSON

Question

I am trying to make a POST request to restful web APIs in Unity.

The header would be Content-Type: application/json

An example of the raw data input is, where data is the key and json string is the value:

{  
   "data":{  
      "username":"name",
      "email":"email@gmail.com",
      "age_range":21,
      "gender":"male",
      "location":"california"
   }
}

Here's my script:

private static readonly string POSTAddUserURL = "http://db.url.com/api/addUser";
public WWW POST()
{
    WWW www;
    Hashtable postHeader = new Hashtable();
    postHeader.Add("Content-Type", "application/json");
    WWWForm form = new WWWForm();
    form.AddField("data", jsonStr);
    www = new WWW(POSTAddUserURL, form);
    StartCoroutine(WaitForRequest(www));
    return www;
}

IEnumerator WaitForRequest(WWW data)
{
    yield return data; // Wait until the download is done
    if (data.error != null)
    {
        MainUI.ShowDebug("There was an error sending request: " + data.error);
    }
    else
    {
        MainUI.ShowDebug("WWW Request: " + data.text);
    }
}

How do I send the request using WWW class with both form and header? Or, just in general, how do I send this kind of post request?

Answer 1

If you want to add raw json data it is better to just pass it without WWWForm

public WWW POST()
{
    WWW www;
    Hashtable postHeader = new Hashtable();
    postHeader.Add("Content-Type", "application/json");

    // convert json string to byte
    var formData = System.Text.Encoding.UTF8.GetBytes(jsonStr);

    www = new WWW(POSTAddUserURL, formData, postHeader);
    StartCoroutine(WaitForRequest(www));
    return www;
}