Is there a good way to "navigate" to the custom 404 page without changing the url

[esped-dfds]

We have a few pages where we use client side routing. We have setup the router, and we search for content with graphql. If there however is no content for this (someone just wrote something in the url), we would like to show the 404 page, but is seems wrong to change the url for this.

One option that works is to navigate to an invalid url, and then immediately change the url back with the history api. It seems a bit hackish however.

Is there a nice solution for this?