WP_HTTP: More relaxed host matching for WP_PROXY_BYPASS_HOSTS and WP_ACCESSIBLE_HOSTS, allowing for subdomains in wildcards to include dashes (and anything else which [\w.] didn't catch). Fixes #24201

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WP_HTTP: When requesting a document with HTTP/1.1 include the 'Connection: Close' header (unless a Connection header is already specified) to prevent the connection being held open and hanging the request process. See #23463

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