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Route pattern cannot start with '/' or> '~', and it cannot contain '?' the character

I am getting an exception with the following route attribute:

[Route("{id}?action=decline")]

An exception:

An exception of type "System.ArgumentException" occurred in System.Web.Http.dll but was not handled in user code.

Additional information: Route pattern cannot start with '/' or '~', and it cannot contain ?? character.

Why is it not allowed?

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I think this is not valid because the query string is not part of the URI Path. (See RFC3986 Section 3.3 Path , it does not include the request part)
But I cannot prove that: /. Perhaps these links will help you:



Routing based on
QueryString parameter name with MVC 5 AttributeRouting in Web API 2
Attribute Routing in ASP.NET Web API 2

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