When we pass # instead of an Integer in url path parameter , why does it accept '#' in place of an Integer?

Question

while doing get operation in spring boot application, like api/getbooks/1 : it fetches the first record. for api/getbooks/@ : gives invalid parameter. but api/getbooks/1# : gives the same result as api/getbooks/1. how can i make it not to accept #?

Answer 1

In the article of URL fragments on Wikipedia can find

The fragment identifier functions differently to the rest of the URI: its processing is exclusively client-side with no participation from the web server, ... When an agent requests a web resource from a Web server, the agent sends the URI to the server, but does not send the fragment

So that is basically the intended behavior the # and everything afterwards is not sent to server. So the URL server gets is the same for both queries.