Permissions Policy
Permissions Policy (formerly Feature Policy) is an HTTP response header that controls which powerful browser features, such as geolocation, camera, microphone, and payment APIs, may run in a document or embedded iframe. Deny by default and allow only what your UI needs.
Technical Architecture & Deep-Dive
Embedded SaaS widgets and customer iframes inherit parent policy unless explicitly delegated. Set restrictive defaults on marketing sites that host third-party scripts, then relax on authenticated app subdomains.
While unrelated to REST JSON directly, Permissions Policy reduces supply-chain script abuse that could steal session cookies or call your public APIs from the user browser.
Key Architectural Benefits
Implement Permissions Policy at the Edge
Deploy lightweight API aggregation, edge caching, and secret injection in minutes without Docker containers or complex servers.
Frequently Asked Questions
Q:Is Permissions Policy the same as OAuth scopes?
No. Permissions Policy governs browser device APIs. OAuth scopes govern server resource access.
Related Architecture Concepts
HTTP security headers are response directives that tell browsers how to handle your site: enforce HTTPS, restrict script sources, block clickjacking, and limit powerful features. They complement API auth because many attacks target how browsers mix your UI with cookies and third-party scripts.
Content Security Policy (CSP) is an HTTP response header that tells browsers which sources of scripts, styles, images, and network connections a page is allowed to use. By blocking unapproved sources, CSP reduces the impact of cross-site scripting and data exfiltration.
Cross-origin isolation is a browser security mode enabled by Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers so a page can use powerful APIs such as SharedArrayBuffer while keeping other origins out of its memory space. Supporting resources must opt in with Cross-Origin-Resource-Policy or CORS.
CSP reporting collects browser telemetry when a Content-Security-Policy blocks a resource or inline script. Directives such as report-uri or Report-To send JSON violation reports to your endpoint so you can tune policies before enforcing strict blocks.
Ready-to-Use Edge Recipes
Webflow is a purely static and frontend visual builder with no backend server. To call private APIs from Webflow custom code without revealing secrets in the browser inspector, route requests through RealComposer. RealComposer stores your API keys in an AES-256-GCM vault, injects credentials at the edge, and handles CORS headers automatically.
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 reverse proxy for third party api key protection, 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.