Werk #15445: SAML metadata endpoint: support HEAD requests

Component	Setup, site management
Title	SAML metadata endpoint: support HEAD requests
Date	Mar 10, 2023
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0b1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Some identity providers (e.g. Net IQ) require the HTTP headers first in order to import the XML metadata. The Checkmk metadata endpoint for SAML now supports this request method.

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