3xx Redirect Codes Explained: 301, 302, 303, 307 & 308
What 3xx HTTP redirect codes mean — 301, 302, 303, 307, 308 — how they differ, which to use for SEO, method/cache behavior, and how to monitor redirects.
4xx Client Errors Explained: 400, 401, 403, 404 & 429
What 4xx HTTP client errors mean — 400, 401, 403, 404, 405, 408, 410, 429 — their causes, how they differ from 5xx, and how to monitor and alert on them.
5xx Server Errors Explained: 500, 502, 503, 504 Fix Guide
Diagnose and fix HTTP 5xx server errors. What 500, 502, 503, 504 and Cloudflare 520-526 mean, common causes per code, and how to monitor each.
Response Body Validation Monitoring: When 200 OK Lies
HTTP 200 does not mean healthy. Validate response bodies for login pages, empty JSON, error templates, missing fields, and stale builds to catch false-green outages.
5xx Error Rate Monitoring: 500, 502, 503 Alert Guide
Track 5xx server error rates in production. Set alerts on 500, 502, 503 patterns and distinguish app bugs from infrastructure failures.
How to Monitor a REST API: Endpoints, Auth, Errors
REST API monitoring goes beyond ping checks. Learn which endpoints to watch, how to validate responses, and when to alert.
HTTP Status Codes Explained: A Complete Guide for Website Monitoring
Every HTTP status code explained — from 200 OK to 503 Service Unavailable. Learn which codes matter for uptime monitoring and when to alert.