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API Request Signing Basics
Prove who sent the request
Signing API requests involves creating HMAC or asymmetric signatures over canonicalized requests with timestamps and nonces, validating on the server to ensure integrity and authenticity while preventing replay.
- request signing
- hmac
- nonce
- timestamp
- integrity
Canonicalize
Normalize method, path, headers, body before signing.
Sign Securely
Use HMAC/asymmetric keys; include timestamp and nonce.
Verify
Check signature, freshness window, and replay cache on the server.
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