This is a small http server that will read images from a provided path, convert the image to gray, and then serve back the converted image
Usage
You can start the server like this:
go run main.go -server 127.0.0.1 -port 8080 -host https://maps.wikimedia.org
If you navigate now to 127.0.0.1:8080/osm-intl/1/0/0.png
, the image from wikimedia will be fetched and then re-served in greyscale