You are responsible for a public web application and its API behind a CDN and load balancer. A junior engineer asks you to explain the HTTP concepts they need to understand before they can safely debug production issues and review basic web security controls. They are seeing redirects, caching behavior, authentication headers, and mixed HTTP/HTTPS traffic in logs, but do not understand what each piece means.
How would you explain the basic HTTP-related concepts that matter for secure operation of a web service, and which ones would you prioritize first when debugging traffic, authentication, and transport-security issues?
HTTP request line, headers, body, and response structureMethods: GET, POST, PUT, PATCH, DELETE, HEADStatus codes: 2xx, 3xx, 4xx, 5xxHeaders, cookies, redirects, caching, and HTTPS