Log Message:
1.22:
Fixed missing brackets in HTTP CONNECT when connecting to IPv6 address via IPv6 \ 
proxy.
Made the connection pool retry on SSLError. The original SSLError is available \ 
on MaxRetryError.reason.
Drain and release connection before recursing on retry/redirect. Fixes deadlocks \ 
with a blocking connectionpool.
Fixed compatibility for cookiejar.
pyopenssl: Use vendored version of six