verify-url is a little tool that used to find out invalid urls in the buffer or region
Execute the command verify-url, it will mark invalid urls in the buffer with verify-url/invalid-url-face
If there is a active region, it will mark invalid urls in the region with verify-url/invalid-url-face
After executed verify-url command, you can use command verify-url/next-invalid-url to goto next invalid-url.
or command verify-url/previous-invalid-url to goto previous invalid-url.