Messages, protection & routes
HTTP, TLS & web servers
See how web requests, HTTPS and reverse proxies work, and use read-only checks to isolate 404 and 502 responses.
- concept
HTTP request and response
Read the method, target, headers, optional body, status and returned content in a small HTTP exchange.
Explore the idea - concept
HTTPS and TLS
Understand what HTTPS protects with TLS, how a browser authenticates a service, and which threats remain.
Explore the idea - concept
Reverse proxy
See how a reverse proxy receives public requests and forwards them to one or more upstream applications.
Explore the idea - troubleshooting
HTTP 404 troubleshooting
Find why a URL returns HTTP 404 using safe request checks, route mapping, static export paths and proxy routing.
Explore the idea - troubleshooting
HTTP 502 troubleshooting
Investigate a proxy 502 by separating upstream response failures from 404, 503 and 504 without risky restarts.
Explore the idea
A successful secure connection, an HTTP response and a healthy upstream are different observations. Follow the request through each layer before changing configuration.