HEAD

HEAD is an HTTP request method used to retrieve information about a resource without actually retrieving the resource itself. In the context of Drupal, HEAD requests are used to check the status of a resource, such as a page or file, without actually downloading the resource. This is useful for checking if a resource is available or if it has been modified since the last time it was requested. HEAD requests are also used to check the response headers of a resource, such as the content type, size, and last modified date.

HEAD requests are sent using the HTTP protocol, which is the same protocol used to send and receive web pages. When a HEAD request is sent, the server responds with the same headers that would be sent with a GET request, but without the actual content of the resource. This allows the client to check the status of the resource without having to download the entire resource.

In Drupal, HEAD requests are used to check the status of a page or file before downloading it. This is useful for checking if a page or file has been modified since the last time it was requested, or if the page or file is still available. HEAD requests are also used to check the response headers of a resource, such as the content type, size, and last modified date.