In Perl, I can do
perl -MIO::Socket::SSL=debug4 my_program.pl
This displays SSL handshake in detail
DEBUG: .../IO/Socket/SSL.pm:2649: new ctx 98842176
DEBUG: .../IO/Socket/SSL.pm:562: socket not yet connected
DEBUG: .../IO/Socket/SSL.pm:564: socket connected
DEBUG: .../IO/Socket/SSL.pm:586: ssl handshake not started
DEBUG: .../IO/Socket/SSL.pm:619: using SNI with hostname fundresearch.fidelity.com
DEBUG: .../IO/Socket/SSL.pm:654: request OCSP stapling
DEBUG: .../IO/Socket/SSL.pm:673: set socket to non-blocking to enforce timeout=180
DEBUG: .../IO/Socket/SSL.pm:686: call Net::SSLeay::connect
DEBUG: .../IO/Socket/SSL.pm:689: done Net::SSLeay::connect -> -1
DEBUG: .../IO/Socket/SSL.pm:699: ssl handshake in progress
DEBUG: .../IO/Socket/SSL.pm:709: waiting for fd to become ready: SSL wants a read first
DEBUG: .../IO/Socket/SSL.pm:729: socket ready, retrying connect
DEBUG: .../IO/Socket/SSL.pm:686: call Net::SSLeay::connect
DEBUG: .../IO/Socket/SSL.pm:2552: did not get stapled OCSP response
DEBUG: .../IO/Socket/SSL.pm:2505: ok=0 cert=102327360
DEBUG: .../IO/Socket/SSL.pm:689: done Net::SSLeay::connect -> -1
DEBUG: .../IO/Socket/SSL.pm:692: SSL connect attempt failed
DEBUG: .../IO/Socket/SSL.pm:692: local error: SSL connect attempt failed error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed
DEBUG: .../IO/Socket/SSL.pm:695: fatal SSL error: SSL connect attempt failed error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed
DEBUG: .../lib/Net/HTTPS.pm:69: ignoring less severe local error 'IO::Socket::IP configuration failed', keep 'SSL connect attempt failed error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed'
DEBUG: .../IO/Socket/SSL.pm:2682: free ctx 98842176 open=98842176
DEBUG: .../IO/Socket/SSL.pm:2687: free ctx 98842176 callback
DEBUG: .../IO/Socket/SSL.pm:2694: OK free ctx 98842176
Error GETing https://fundresearch.fidelity.com/mutual-funds/fees-and-prices/316343201: Can't connect to fundresearch.fidelity.com:443 at -e line 1.
see example in Perl SSL debug mode
I'd like to use something similar to this in Python, from command line or inside python script, to display SSL handshake in detail.
Thank you