This version of Unity is unsupported.
Unity UI
Unity Web Request Asset Bundle

Unity Web Request

com.unity.modules.unitywebrequest 2019.2 verified 

Description

The UnityWebRequest module lets you communicate with http services. Scripting API: https://docs.unity3d.com/ScriptReference/UnityEngine.UnityWebRequestModule.html

Version information

Compatible with Unity

These package versions are compatible with Unity version 2019.2:

Documentation location: Versions available:
UnityEngine.UnityWebRequestModule.html 1.0.0

Verified for Unity

Package version 1.0.0 is verified to work with 2019.2.

Unity UI
Unity Web Request Asset Bundle