I am trying to send multipart form data via a `UnityWebRequest` to a REST service. The request is built with the following code:
public IEnumerator Post(string uri, WWWForm data, Action onFinished = null)
{
Request = UnityWebRequest.Post(uri, data);
yield return sendRequest();
if (onFinished != null)
onFinished(Request, UploadException);
}
(This is missing some context from the rest of the class, but the important part is the `UniytWebRequest.Post(uri, data);` line).
In previous versions of Unity this has worked fine, but in 2017.3, the remote server has started returning a 411 Length Required error.
Looking at the request object before it is sent, I see that the Content-Type header is set, but no Content-Length header is present. I attempted to set the header manually, but got the following error: `InvalidOperationException: Cannot override system-specified headers`
Is there another way to set the outgoing content length header in 2017.3?
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