(Quick Reference) ## response ### Purpose The `response` object is an instance of the Servlet API’s HttpServletResponse class ### Examples
    class BookController {
        def downloadFile() {
            byte[] bytes = // read bytes
            response.outputStream << bytes
        }
    }
### Description The Servlet API’s `HttpServletResponse` class can be used within Grails to perform all typical activities such as writing out binary data, writing directly to the response and sending error response codes to name but a few. Refer to the documentation on the HttpServletResponse class in the Servlet API for more information. Grails provides the following additional methods and/or properties on the `response` object `format` - The request format, used for Content Negotiation. `withFormat(Closure)` - The withFormat method, used for Content Negotiation. Grails also overrides the left shift operator on the `response` object making it easier to write to the response writer:
    response << "Hello World"
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