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.
If you don't want to modify the nifi.properties file directly, you can pass custom variables to the application during the Docker command using the -e flag. In your case, Docker is aware that port 8081 should map to 8080, but NiFi is not, and detects a mismatch on the incoming request host header. To pass this through, try using a command like the following.
docker run --name nifi \
-p 8081:8081 \
-d \
-e NIFI_WEB_HTTP_PORT='8081'
apache/nifi:latest