Heres another way to do it without the subshell, using tr.

       #!/bin/sh
       IFS=/;while read w x y z;do
       v=$(echo x|tr x '\34');
       case $w in http:|https:);;*)exit;esac;
       case $x in "");;*)exit;esac;
       echo $y > .host
       printf '%s\r\n' "GET /$z HTTP/1.1";
       printf '%s\r\n' "Host: $y";
       printf 'Connection: keep-alive'$v$v;done \
       |sed '$s/keep-alive/close/'|tr '\34\34' '\r\n' > .http;
       read x < .host;
       # SNI;
       #openssl s_client -connect $x:443 -ign_eof -servername $x < .http;
       # no SNI;
       openssl s_client -connect $x:443 -ign_eof -noservername < .http;
       exec rm .host .http;