model binding

Handling query string parameters with no value in ASP.NET Core

Query strings are typically made of a sequence of key-value pairs, like ?foo=hello&bar=world…. However, if you look at RFC 3986, you can see that query strings are very loosely specified. It mentions that query components are often used to carry identifying information in the form of “key=value” pairs But it's just an observation, not a rule (RFCs usually have very specific wording for rules, with words like MUST, SHOULD, etc.