Insights & Updates
Practical articles on code quality, web performance, accessibility, and developer tooling — written by the engineers building CodeAva.
OpenAPI 3.1 Validation Errors: Common Causes and Fixes
Fix OpenAPI 3.1 validation errors involving $ref, path parameters, responses, examples, security schemes, and JSON Schema dialect changes.
DNS Record Debugging: A, AAAA, CNAME, TXT, MX, and CAA Explained
Site down, email bouncing, or SSL renewal failing? Debug A, AAAA, CNAME, TXT, MX, and CAA records using authoritative answers, TTLs, and dig.
TLS Certificate Chain Errors: Hostname, Expiry, Intermediates, and Trust
Debug SSL validation errors caused by missing intermediates, hostname mismatches, expiry, incorrect chains, or client trust-store differences.
Webhook Signature Verification: Stripe, GitHub, Slack, and Shopify
Secure webhook endpoints with byte-exact HMAC verification, safe comparisons, replay defenses, and working Stripe, GitHub, Slack, and Shopify patterns.
JWKS kid Mismatch: Why JWT Signature Verification Fails
Sudden API 401 errors? Diagnose stale JWKS caches, signing-key rotation, wrong issuers, algorithm mismatches, and unsafe unknown-kid refresh behavior.
Docker Compose Port, Healthcheck, and Dependency Failures: The DevOps Guide
Fix Docker Compose startup races, unhealthy dependencies, host-port collisions, localhost mistakes, and accidentally exposed databases.
GPTBot, OAI-SearchBot, Google-Extended, and llms.txt: What Each Controls
Protect your content without losing search visibility. Learn which AI crawler rules affect training, search, grounding, and llms.txt discovery.
CDN Caching Mistakes That Make Fast Sites Feel Slow
Is your CDN actually caching your content? Learn why cache MISS responses happen, how query strings and Vary headers fragment cache keys, and how to verify edge performance.
AWS Cron vs Linux Cron: Why the Same Expression Fails in EventBridge
Moving Linux cron jobs to AWS? Learn why valid crontab expressions fail in EventBridge, how AWS cron fields work, and when to use EventBridge Scheduler for time zones.
Common Canonicalisation Mistakes in CMS and Next.js Sites
Learn the most common canonicalisation mistakes in CMS and Next.js sites, from relative canonicals and query-parameter bloat to redirect conflicts and stale template logic.
How to Use HTTP Caching Headers to Improve Real-World Performance
Learn how to use Cache-Control, ETag, Last-Modified, stale-while-revalidate, and shared-cache directives to improve real-world performance without breaking freshness.
no-floating-promises vs no-misused-promises: When to Use Each
TypeScript types do not protect your async lifecycle. Learn the difference between floating promises and misused promises, and when each ESLint rule should catch them.
