CORS Security Guide

Same-Origin Policy (SOP)

Browsers block cross-origin requests by default. Two URLs have the same origin if their protocol, host, and port all match.

CORS Headers Reference

Access-Control-Allow-OriginSpecify allowed origin(s). Never use * with credentials.
Access-Control-Allow-MethodsList allowed HTTP methods
Access-Control-Allow-HeadersList allowed request headers
Access-Control-Allow-CredentialsSet true only when credentials (cookies) needed
Access-Control-Max-AgeCache preflight response (seconds)

関連ツール

🔒 SSL Certificate Checker Check SSL certificate status & expiry 🧮 Password Entropy Calculator Calculate password entropy & strength 🛡 XSS Reference XSS payloads and defense reference 🗃 SQL Injection Reference SQL injection testing & defense guide 🛡 CSP Policy Generator Generate Content Security Policy 🔑 OAuth 2.0 Builder Build OAuth 2.0 auth request params 🔍 Sensitive Info Detector Detect secrets & passwords in text 🔒 Hash Algorithm Reference Hash algorithm security reference 🔐 SSL/TLS Reference SSL/TLS versions & cipher suites ref 🎫 JWT Best Practices JWT security guide & common errors ⚡ Rate Limiting Patterns Token bucket, sliding window algos 🔍 Dependency Audit Reference npm/pip/go dependency audit commands