The first blocker to add HTTP/2 support to urllib3 is to have a test server that supports HTTP/2. Since Tornado does not have plans to support HTTP/2, we're migrating to Hypercorn. This issue is about migrating all child classes of HTTPDummyServerTestCase.

HTTPDummyServerTestCase

• Migrate TestPoolManager to Hypercorn #3193
• Migrate TestHTTPWithoutSSL to Hypercorn #3209
• Migrate TestConnectionPool to Hypercorn #3205
• Migrate test_connection.py to Hypercorn #3208
• Migrate TestRetry to Hypercorn #3210
• Migrate RetryAfter to Hypercorn #3212
• Migrate final connection pool tests to Hypercorn #3213

HTTPSDummyServerTestCase

• Migrate supported_tls_versions to Hypercorn #3214
• Migrate TestHTTPS to Hypercorn #3217
• Migrate TestHTTPSWithoutSSL to Hypercorn #3211

IPv6HTTPDummyServerTestCase

• Migrate TestIPv6PoolManager to Hypercorn #3215

HTTPDummyProxyTestCase and IPv6HTTPDummyProxyTestCase

• Migrate remaining proxy tests to Hypercorn #3226

PyodideDummyServerTestCase

• Migrate emscripten test server to Hypercorn #3230

Tornado

• Remove Tornado #3253