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Using a CORS proxy for third-party APIs: risks and guardrails
Why teams introduce proxies, how allowlists reduce abuse, and what to monitor when exposing a public endpoint.
1 min read
proxyapicors
Why proxies appear in frontend stacks
Public APIs often omit browser-specific CORS headers. A proxy you control adds those headers after validating the caller and target.
Moving calls to your backend avoids CORS entirely but shifts operational load; a managed proxy product balances both models.
Minimum controls
Require API keys, limit upstream hosts and paths, rate limit per key, and strip dangerous headers from responses.
Log usage and alert on spikes—open relays become abuse magnets within hours.