What Rhandom pointed out is why we need to collect the information. Manny thanks to hippo, sundialsrv4 for pointing out the documents, but I still don't quite understand this.

Correct me if my question is silly. The protocol version ( SSL/TLS version) I want to collect is the ones from this clients, not from my Apache server. Is the var $ENV{SSL_PROTOCOL} my server's SSL version or the client's SSL version? My understanding is that the variable SSL_PROTOCOL is my apache server's configuration variable, not from the cilent.

Apache relies on OpenSSL to do security handshakes, so Apache does not care the client's version of SSL/TLS? and could not log it?

In reply to Re^3: Is it possible to check the client's SSL/TLS version? by khandielas
in thread Is it possible to check the client's SSL/TSL version? by khandielas

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.