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Similarly to the automic SNI selection for regulat SSL traffic, the SNI of health-checks HTTPS connection is now automatically set by default by using the host header value. "check-sni-auto" and "no-check-sni-auto" server settings were added to change this behavior. Only implicit HTTPS health-checks can take advantage of this feature. In this case, the host header value from the "option httpchk" directive is used to extract the SNI. It is disabled if http-check rules are used. So, the SNI must still be explicitly specified via a "http-check connect" rule. This patch with should paritally fix the issue #3081.