format(view_path = []) public

Returns the MIME type for the \format used in the request. 

  GET /posts/5.xml   | request.format => Mime::XML
  GET /posts/5.xhtml | request.format => Mime::HTML
  GET /posts/5       | request.format => Mime::HTML or MIME::JS, or request.accepts.first depending on the value of <tt>ActionController::Base.use_accept_header</tt>
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