Steps to reproduce:
1. Open attached project
2. Build on Android and run
3. Make sure URL has 1 slash like so 'file:/*` in the input field
4. Press button 'Send'
-Request timeout error is returned

Actual result: When accessing Streaming Assets on Android using UnityWebRequest, "Request timeout" error is returned.
Expected result: A more proper error should be thrown e.g. "Malformed URL"

Reproduced on: 2017.4.18f1, 2018.3.2f, 2019.1.0a14, 2019.2.0a2

Devices under test:
VLNQA00022, Xiaomi Redmi Note 3 (Redmi Note 3), 5.1.1, CPU: Snapdragon 617 MSM8952, GPU: Adreno (TM) 510