UnityWebRequest.Put fails on iOS

I am trying to upload a file to a vanilla Apache Webserver (v2.4.18) using UnityWebRequest and its Put(uri, bodyData)-Method. The server uses HTTPS and an authentication via username and password. Here's the code I use:

Code (CSharp):

string url = "https://" + username + ":" + password + "@" + serverUrl + "/" + filename;
byte[] myData = Encoding.UTF8.GetBytes(csvString);
UnityWebRequest www = UnityWebRequest.Put(url, myData);
yield return www.Send();
// and some debugging errors etc. after...

UnityWebRequest.Put fails on iOS

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