Chrome Error code: Err_unsafe_port

Using Nutz to build a server, follow the tutorial you wrote to find this error:

then I found out that the tutorial missed the web.xml problem, but when I added it, I still couldn't access the site ... The port is already in use, but the ping is not working, and the last thing to find is that the6666 port is one of the chrome default unsecured ports , so the lucky numbers are not safe ... The error message is the smallest line of text in the previous image Err_unsafe_port

finally changed to 9999 can always ... specific also what unsafe ports, see this blog.