Werk #18250: check_http: Fix proxy authentication

Component	Checks & agents
Title	check_http: Fix proxy authentication
Date	Jun 23, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

When a proxy server with authentication is configured for the Check HTTP service, the service became {CRIT} with the message

Cannot make SSL connection

This has been fixed.

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