allow custom host header for azure load balancer health probes
HTTP health probes for Azure load balancer are hard-coded to use the IP of backend as their host headers. This forces the backend hosts have to be configured to allow its IP as one of its allowed domain. It's very surprising that Azure doesn't custom host header for HTTP(s) health probes. Please add custom headers for HTTP(s) heath probes; at least, host header support should be there.
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