Web API query string parameter binding

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MVC

WebAPI

I have issue regarding URL parameter binding for example

http://localhost:xxxxx/api/GetBooks its works fine

http://localhost:60117/api/GetBooks###777 also works for me

how to get rid of ###777 after controller ?

What I have tried:

I have tried so far Attribute Routing. I think I have to use filter for get rid of this so can anyone tell me Filter for Parameter binding ?

Thanks all help will be appreciated