Lots of logging from HTTPS-by-default requests

[gsnedders]

Running against Safari you'll currently see stderr output, hopefully soon logging output (#48902) like:

 2:39.88 wptserve WARNING 127.0.0.1 - - [13/Mar/2025 18:24:44] code 400, message Bad request version ('\x93ͯ_f#Ñ°\x87:0â\x00*ÚÚ\x13\x01\x13\x02\x13\x03À,À+Ì©À0À/̨À')
 2:39.88 wptserve WARNING 127.0.0.1 - - [13/Mar/2025 18:24:44] code 400, message Bad HTTP/0.9 request type ('\x16\x03\x01\x02\x00\x01\x00\x01ü\x03\x03ðkd\x93×\x19Áe\x8c\x9cá\x14Yr"¡¦òF=\x08ºIºt±qbÙE\x1aX')
 2:39.88 wptserve WARNING 127.0.0.1 - - [13/Mar/2025 18:24:44] code 400, message Bad request version ('L\x83ä=o/ų\x9d\x11')
 2:39.88 wptserve WARNING 127.0.0.1 - - [13/Mar/2025 18:24:44] code 400, message Bad request version ('æ\x98\x9d\x92\x07Y{û\x00*ÚÚ\x13\x01\x13\x02\x13\x03À,À+Ì©À0À/̨À')

This as far as I can tell ultimately comes about from HTTPS-by-default attempting to connect to the server.

However, as far as I can tell, Firefox also ships HTTPS-by-default, and I don't see the pref being turned off for WPT, and yet I don't see such logging from Firefox.

@jgraham Do you know, or know who to ask, why HTTPS-by-default doesn't trigger this in Firefox?