SameSite Cookies
The SameSite cookie attribute controls whether browsers send cookies on cross-site requests. Strict limits cookies to same-site navigations, Lax allows top-level GET navigations, and None requires Secure and enables third-party contexts when explicitly needed.
Technical Architecture & Deep-Dive
Modern browsers default new cookies to Lax, which blocks many CSRF POSTs without breaking normal links. Embedded widgets, payment iframes, or cross-site OAuth returns may need None; Secure with tight Origin validation.
When your API sits on api.example.com and the SPA on app.example.com, treat them as same-site if they share a registrable domain and use correct cookie Domain paths. Cross-domain SaaS embeds need explicit threat modeling before choosing None.
Key Architectural Benefits
Implement SameSite Cookies at the Edge
Deploy lightweight API aggregation, edge caching, and secret injection in minutes without Docker containers or complex servers.
Frequently Asked Questions
Q:Does SameSite replace CORS configuration?
No. SameSite governs cookies. CORS governs whether JavaScript may read cross-origin responses. You need both for browser-heavy APIs.
Related Architecture Concepts
HttpOnly is a cookie attribute that prevents client-side JavaScript from reading the cookie value. Browsers still attach HttpOnly cookies automatically on same-site requests, which keeps session tokens out of reach of typical XSS payloads.
CSRF protection defends against cross-site request forgery, where a malicious site tricks a victim browser into sending authenticated requests to your API using existing cookies or sessions. Defenses include unpredictable anti-CSRF tokens, SameSite cookie attributes, and verifying Origin or Referer headers on state-changing calls.
Cross-Origin Resource Sharing (CORS) is a browser security mechanism that controls whether a web page on one origin may read responses from another origin. Servers advertise permitted caller origins and methods using HTTP response headers such as Access-Control-Allow-Origin.
Allowed origins are a configured list of website domains permitted to call an API from a browser. The server or gateway checks the Origin header of each request and only returns CORS permission headers, or accepts the request, when the origin is on the allowlist.
Ready-to-Use Edge Recipes
To solve fix cors error in webflow api call, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
To solve how to fix cors error in flutterflow api call, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
To solve call clerk backend api from client side, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.