Guides tagged “Http”
Reviewed developer guides with worked examples, limitations and links to the standards or documentation behind the tools.
CORS Preflight Requests Explained with Real OPTIONS ExamplesUnderstand when browsers send an OPTIONS preflight, what headers they ask for, and how a server should answer without weakening cross-origin policy.Why Access-Control-Allow-Origin: * Fails with CredentialsWhy wildcard origins and credentialed browser requests do not mix, what to return instead, and how to avoid reflecting untrusted origins.HTTP Security Headers: What Each Header Actually DoesA practical map of HSTS, CSP, X-Content-Type-Options, Referrer-Policy, Permissions-Policy and legacy frame protections, with deployment caveats.Content-Security-Policy Explained: Start with a Safe BaselineBuild a CSP from default-src, script-src, object-src, base-uri and frame-ancestors, then tighten it with reporting instead of copying a header blindly.