: Open your coding tool or terminal. Make sure you start your development script (like npm start or a similar command) before opening the link. Port Already in Use
Enter Charles Babbage, the eccentric "father of the computer." He saw Jacquard's loom and realized that if a machine could weave patterns in silk, it could weave patterns in logic. He designed the Analytical Engine, the first general-purpose computer concept. It was never built in his lifetime, but it was programmable via punch cards.
Update your project's README.md file to explicitly state that the local server runs on port 11501. This saves setup time for new collaborators. http localhost 11501
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: This is a special name that means "this exact computer". It points back to your own machine instead of the internet. : Open your coding tool or terminal
: This is the "loopback" address ( 127.0.0.1 ) used to access web services running on your own computer without an internet connection.
Vulnerabilities can exist in development servers themselves. For example, CVE-2020-11501 was a vulnerability in GnuTLS (a TLS/SSL library) where DTLS clients would send all-zero randomness in handshake messages, breaking security guarantees. He designed the Analytical Engine, the first general-purpose
| Status | Interpretation | |--------|----------------| | Connection refused | No service listening on port 11501 | | 200 OK | Service running, response body shown | | 404 Not Found | Service up but wrong endpoint | | 403 Forbidden | Access denied | | Timeout / no response | Firewall or service stalled |