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    If they aren't using HTTPS, you can replace your step 1 (openssl s_client -connect example.com:443) with telnet example.com 80. Commented Feb 28, 2013 at 1:41
  • On Unix these send LF for line terminator not CRLF as specified by 1945/2068/2616/7230 and might be rejected, ignored, or handled differently by a server; to be safe use s_client with -crlf or redirect the input from a file created with unix2dos or ctl-V ctl-M or equivalents, or a pipeline that uses e.g. printf '%s\r\n' "GET / HTTP/1.1" "Host: whatever" "" Commented Aug 11, 2021 at 1:26