Fragments are worse than described here. Fragments are incompatible with redirects. Not only does the browser not send them, but any server-side redirects will either require active-JS redirects to capture and redirect the fragment, or strip the fragment as inappropriate/pointless, or if you're very lucky, maintain it somehow through the redirect. Do not use fragments for any critical function without vetting your entire workflow and all servers and useragents in your request/response path.