Handle request with .gsp in URL

In Grails 6.2.3, I have to handle request with .gsp extension like http://localhost:8080/report/view.gsp?a=b

I can't map this URL to controller, action. It will always return error 404.

The default UrlMappings.groovy below should handle this case because .$format is optional. It should simply mapped to $controller and $action.

        "/$controller/$action?/$id?(.$format)?"{
        constraints {
            // apply constraints here
        }

I test URL with many other extensions and they are all work without any modification to UrlMappings.groovy. For example

• http://localhost:8080/report/view.gspx?a=b
• http://localhost:8080/report/view.abc
• http://localhost:8080/report/view.xyz

This question suggests it should work, but it from Grails-3.3. Grails: URL mapping with .gsp extension/format

This is happening because your *.gsp paths are being handled by GroovyPagesServlet. To fix it, you need to remove GroovyPagesServlet:

• Instead, create a mock servlet class

package stackoverflow

class GroovyPagesServletMock {
}

• Then register it in resources.groovy

import stackoverflow.GroovyPagesServletMock

// Place your Spring DSL code here
beans = {
    groovyPagesServlet(GroovyPagesServletMock)
}

I got it working this way. Hope this helps!

Sample https://github.com/mkmikael/stackoverflow79641438