I'm running an Apache NiFi instance using Docker at my workplace with a proxy in place. I pulled the official container down, spun up the container and set it to port over to 8081 instead of 8080 as the work proxy is set for 8080.

However when I try to access NiFi via the browser on my dev machine using `http://localhost:8081/nifi` I'm getting the following error appear

`System Error`

`The request contained an invalid host header [localhost:8081] in the request [/nifi]. Check for request manipulation or third-party intercept.`

I've found a couple of posts online mention the `nifi.properties` file, but I'm not very experienced with Docker outside of spinning up images. 

If anyone can offer some guidance or a soltion that would be excellent. Many Thanks.