HTTP, DNS & TLS

Tools in this cluster

• Look up HTTP status codesHTTP Status Explorer
• Run a DNS lookupDNS Lookup
• Check an SSL certificateSSL Certificate Checker
• Look up an IP addressIP Lookup
• WHOIS lookupWHOIS Lookup
• Check an open portPort Checker
• Send an HTTP requestAPI Tester

Learning loop

Tutorial → cheat sheet → interview prep → comparisons

• Tutorial: How to Use the HTTP Status Explorer…
• Compare: HTTP Status Explorer vs HTTPStatuses.com…

Priority keywords

Seed metrics for planning — see keyword research.

Primary sources

• RFC 9110 — HTTP Semantics
• MDN — HTTP response status codes