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[Bug 62837] New: SNI extension not set in healthcheck requests


            Bug ID: 62837
           Summary: SNI extension not set in healthcheck requests
           Product: Apache httpd-2
           Version: 2.4.35
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy_hcheck
          Assignee: bugs@xxxxxxxxxxxxxxxx
          Reporter: dominik.stillhard@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
  Target Milestone: ---

The SNI extension is not set on health check requests to a backend using TLS
encryption. Because health checks are negative, this leads to ordinary requests
also being denied.

on the backend server i have the following error:

    AH02033: No hostname was provided via SNI for a name based virtual host

I’ve also investigated it with wireshark, the extionsion is defenitely not set.

My config looks as follows:

ServerName www.localhost.com

    ServerName www.localhost.com
    ServerAlias localhost.com
    SSLCertificateFile /etc/httpd/ssl/ca.crt
    SSLCertificateKeyFile /etc/httpd/ssl/ca.key
    SSLEngine on
    SSLProxyEngine on

    ProxyHCExpr isok {%{REQUEST_STATUS} =~ /^[23]/}
    ProxyHCTemplate template hcinterval=5 hcexpr=isok hcmethod=get

  <Proxy balancer://mycluster lbmethod=byrequests>
    ProxyPreserveHost On
    SSLProxyProtocol  TLSv1

  <Location />
    ProxyPass  balancer://mycluster/
    ProxyPassReverse  balancer://mycluster/

I’ve read that ProxyPreserveHost should be «on», but this doesn’t solve the
I think it could be related to this comment in hc_determine_connection:

     * normally, this is done in ap_proxy_determine_connection().
     * TODO: Look at using ap_proxy_determine_connection() with a
     * fake request_rec

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