HostDirectives

Extracts the hostname part of the Host request header value.

Rejects all requests with a host name that doesn't have a prefix matching the given regular expression. For all matching requests the prefix string matching the regex is extracted and passed to the inner route. If the regex contains a capturing group only the string matched by this group is extracted. If the regex contains more than one capturing group an IllegalArgumentException is thrown.

Rejects all requests for whose host name the given predicate function returns false.

Rejects all requests with a host name different from the given ones.