{new} @HasQuery

Identical to {@link oaj.http.annotation.HasFormData @HasFormData}, but only checks the existing of the parameter in the URL string, not URL-encoded form posts.

- {@link oaj.http.annotation.HasQuery HasQuery}

Unlike {@link oaj.http.annotation.HasFormData @HasFormData}, using this annotation does not result in the servlet reading the contents of URL-encoded form posts. Therefore, this annotation can be used in conjunction with the {@link oaj.http.annotation.Body @Body} annotation or {@link oajr.RestRequest#getBody()} method for `application/x-www-form-urlencoded POST` calls.

##### Example:

@RestMethod(name=GET) public void doGet(@HasQuery("p1") boolean p1) {...}

This is functionally equivalent to the following code:

@RestMethod(name=GET) public void doGet(RestRequest req) { boolean p1 = req.hasQuery("p1"); ... }

The parameter type must be either boolean or {@link java.lang.Boolean}.

The following table shows the behavioral differences between @HasQuery and @Query:

`Query content` | `@HasQuery("a")` | `@Query("a")`
--- | --- | ---
`?a=foo` | true | "foo"
`?a=` | true | ""
`?a` | true | null
`?b=foo` | false | null