HTTPRoute.spec.rules[].backendRefs.filters.requestMirror.spec.hostnames

Hostnames defines a set of hostnames that should match against the HTTP Host header to select a HTTPRoute used to process the request. Implementations MUST ignore any port value specified in the HTTP Host header while performing a match and (absent of any applicable header modification configuration) MUST forward this header unmodified to the backend. Valid values for Hostnames are determined by RFC 1123 definition of a hostname with 2 notable exceptions: 1. IPs are not allowed. 2. A hostname may be prefixed with a wildcard label (`*.`). The wildcard label must appear by itself as the first label. If a hostname is specified by both the Listener and HTTPRoute, there must be at least one intersecting hostname for the HTTPRoute to be attached to the Listener. For example: * A Listener with `test.example.com` as the hostname matches HTTPRoutes that have either not specified any hostnames, or have specified at least one of `test.example.com` or `*.example.com`. * A Listener with `*.example.com` as the hostname matches HTTPRoutes that have either not specified any hostnames or have specified at least one hostname that matches the Listener hostname. For example, `*.example.com`, `test.example.com`, and `foo.test.example.com` would all match. On the other hand, `example.com` and `test.example.net` would not match. Hostnames that are prefixed with a wildcard label (`*.`) are interpreted as a suffix match. That means that a match for `*.example.com` would match both `test.example.com`, and `foo.test.example.com`, but not `example.com`. If both the Listener and HTTPRoute have specified hostnames, any HTTPRoute hostnames that do not match the Listener hostname MUST be ignored. For example, if a Listener specified `*.example.com`, and the HTTPRoute specified `test.example.com` and `test.example.net`, `test.example.net` must not be considered for a match. If both the Listener and HTTPRoute have specified hostnames, and none match with the criteria above, then the HTTPRoute is not accepted. The implementation must raise an 'Accepted' Condition with a status of `False` in the corresponding RouteParentStatus. In the event that multiple HTTPRoutes specify intersecting hostnames (e.g. overlapping wildcard matching and exact matching hostnames), precedence must be given to rules from the HTTPRoute with the largest number of: * Characters in a matching non-wildcard hostname. * Characters in a matching hostname. If ties exist across multiple Routes, the matching precedence rules for HTTPRouteMatches takes over. Support: Core