Function: Parse a request argument based on details registered to the route.

Function: Determines if an IP address is valid.

Function: Changes a boolean-like value into the proper boolean value.

Function: Determines if a given value is boolean-like.

Function: Retrieves the avatar urls in various sizes.

Function: Adds the REST API URL to the WP RSD endpoint.

Function: Outputs the REST API link tag into page header.

Function: Sends a Link header for the REST API.

Function: Checks for errors when using cookie-based authentication.

Function: Collects cookie authentication status.