How to reproduce:
1. Setup an IPV6 Wifi
2. Create a new Unity Project
3. Attach "test.cs" script to a GameObject on the scene
4. Build and run the scene on an Android device

Expected Behavior: The UnityWebRequest is successful
Actual Behavior: Error is thrown "Cannot connect to the destination host with code 0"

Reproducible with: 2019.4.0f1
Not reproducible with(Customer Info): 2018.4.26f1

Note:
- The issue was only reproduced by the Customer. So all the info provided was gathered from the conversation with the customer.
- According to the Customer this issue is a regression since it was not reproducible in 2018.4 and was found in 2019.4
- Customer so far only provided info about 2018.4 and 2019.4 streams so it is unclear if the regression was actually introduced in 2019.4 or earlier versions