How to turn off localhost web server

I've discovered by accident that my Mac is running a localhost web server. I typed "localhost" into Safari and got "It works!" I get the same result when I go to http://127.0.0.1:80 . My question is: How do I turn this thing off? I've tried things like this: $ sudo apachectl stop And $ sudo launchctl unload -w /System/Library/LaunchDaemons/org.apache.httpd.plist But this changes nothing, and the Terminal complains /System/Library/LaunchDaemons/org.apache.httpd.plist: Could not find specified service I'm running Catalina. No MAMP. I did at one point a couple of years ago run npm briefly, but there is no evidence that this is its server (for one thing, it's on port 80). ---- Following up on Gordon Davisson's suggestion, I tried $ sudo lsof -i | grep LISTEN and got:

rapportd   462  mattneubelcap    4u  IPv4 0x3fcd6c7f11a6984d      0t0    TCP *:49169 (LISTEN)
rapportd   462  mattneubelcap    5u  IPv6 0x3fcd6c7f0a82c41d      0t0    TCP *:49169 (LISTEN)
cupsd     1117           root    5u  IPv6 0x3fcd6c7f0a829f5d      0t0    TCP localhost:ipp (LISTEN)
cupsd     1117           root    6u  IPv4 0x3fcd6c7f1975f0cd      0t0    TCP localhost:ipp (LISTEN)