HI,

[NETWORKING] "GENERIC/UNKNOWN HTTP ERROR"
This problem is very common. If you have worked with Rest API then things are pretty easy to understand.
For More Details You Can Check : https://www.sevenmentor.com/

I wonder how much of this is due to "Cleartext HTTP traffic to [MY_IP] not permitted" issue under the hood. Spent hours on code that probably worked in the first hour .... see https://forum.unity.com/threads/android-9-cleartext-http-traffic-to-my_ip-not-permitted.594298/

I have the same problem, iOS only, on a POST, after moving to Unity 2019.1. No solution worked for now...

i get this in unity 2018.2.0f2 it happend in some android devices

The trick is to use a DownloadHandler. DownloadHandlers manage and process HTTP response body data received from a remote server hence the actual error message is in DownloadHandlerBuffer. In order to get the error message from the server instead of just "GENERIC/UNKNOWN HTTP ERROR" catch the error and get the downloadhandler text.

if (this.request.isNetworkError || this.request.isHttpError)
{
throw new Exception(this.request?.downloadHandler?.text ?? this.request.error);
}

I get this in 2018.3.12f1. Why has this been marked as fixed?

I am still having this error in unity 2018.3.9f1 on Android. Works fine in the editor and on iOS. I have tired turning of httpcontinue and chucked coding without success. I have tired starting with a PUT then change it to a POST. Still does not work. Verified fiddler is returning 200. Error status is http/generic Code is 0. Download.text is blank.

I've fixed it by set "www.chunkedTransfer = true;"

I had the same problem in my linux builds with unit 2018.2.18

The solution was to install curl in my linux boxes.

I'm still having this issue in 2018.2. I tried the www.chunkedTransfer = false and still receive the error.