Fragments indeed don't get sent to the server, and are usually used to track your location inside the document (be it jumping to section headers, or using js-ge

Fragments indeed don't get sent to the server, and are usually used to track your location inside the document (be it jumping to section headers, or using js-generated dialog boxes, etc.). In an ideal world, this fragment is not changed unless the user explicitly changes the state. Unfortunately, apps often use it to store their own state.