oauth2-proxy/docs/versioned_docs/version-7.0.x/features/request_signatures.md

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request_signatures Request Signatures

If signature_key is defined, proxied requests will be signed with the GAP-Signature header, which is a Hash-based Message Authentication Code (HMAC) of selected request information and the request body see SIGNATURE_HEADERS in oauthproxy.go.

signature_key must be of the form algorithm:secretkey, (ie: signature_key = "sha1:secret0")

For more information about HMAC request signature validation, read the following: