URL for local npm repository

Is there a way to get the port number, 443 here, out of the address shown below? I have a problem with the correct repository settings for npm because every time it tries to connect where nothing exists.

Log example:

npm http fetch GET 200 https://registry.softice.com/repository/npm-2iq-group/has-symbols 6ms (cache hit)
npm timing idealTree:node_modules/has-symbols Completed in 0ms
npm ERR! 404 Not Found - GET http://registry.softice.com:443/repository/npm-2iq-group/has-symbols/-/has-symbols-1.0.3.tgz
npm ERR! 404 
npm ERR! 404  'has-symbols@http://registry.softice.com:443/repository/npm-2iq-group/has-symbols/-/has-symbols-1.0.3.tgz' is not in this registry.
npm ERR! 404 


Are you running Nexus behind a reverse proxy, and if so did you follow the instructions in the help site about the headers that need to be set?