API Key Header Stripped by Reverse Proxy or Load Balancer
An API key that's correctly sent by the client but never actually reaches your backend application usually means an intermediate layer — a reverse proxy, load...
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Content Security Policy (CSP) Blocking Inline Script or API Connection
A Content Security Policy violation always names the specific directive that blocked the resource and the exact source that was blocked — the browser console...
JWT Algorithm Confusion Vulnerability (HS256 vs RS256), Basic Explanation
The JWT algorithm confusion vulnerability exploits a library or application that trusts the algorithm specified inside the token itself, rather than enforcing...
JWT "nbf" (Not Before) Claim Error Causing Validation Failures Across Timezones
An nbf (Not Before) validation failure is virtually never actually a timezone problem, even though it often gets diagnosed that way — JWT timestamp claims are...
Rate Limiting Per IP Failing Behind Cloudflare/Reverse Proxy (Incorrect Client IP)
Application-level rate limiting that seems to treat every visitor as the same client, or that's trivially bypassable, almost always means your framework is...
SSH Host Key Verification Failed Error Fix After Server IP Change
SSH's host key warning after a server's IP address changes, or after a genuine reinstall, is the client correctly detecting that the server's identity...
API Key Header Leaked in Browser Network Tab, How to Route via Proxy Backend
An API key visible in the browser's Network tab is exposed to anyone with access to developer tools — which is effectively any user of your site — regardless...
JWT "Invalid Signature" Error When Validating Token Across Microservices
A JWT that validates fine within the service that issued it, but fails with "invalid signature" when validated by a different microservice, means the two...
SSL Certificate Expired Error on curl Command Despite Browser Working
When curl reports an expired certificate but every browser connects to the same site without any warning, the certificate itself almost certainly isn't...