The `do_HEAD` method in the `SimpleHTTPRequestHandler` class of the `http.server` module in Python is responsible for handling HEAD requests made to the HTTP server. HEAD requests are similar to GET requests, but instead of returning the body of the response, they only retrieve the headers. This method is overridden in order to provide the appropriate behavior for the HEAD request. It sends the response headers, including the content type and content length if available, without sending the actual content. This allows clients to obtain the necessary information about a resource without transferring the entire content, making it useful for checking the validity or availability of resources.
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