urllib3 uses h2 library for HTTP/2 protocol. Adding support for h2 library error types in urllib3
urllib3 is a HTTP client which is written in python language and h2 is a library for HTTP/2 support in urlib3.
urllib3 is currently open for adding support for HTTP/2 protocol and having milestone for the same (https://github.com/urllib3/urllib3/milestone/10). Currently urlib3 is lacking support for handling h2 library error return types.
We will be working to add support for all h2 library error return types.