PlugSignature.ConnTest.with_digest

You're seeing just the function with_digest, go back to PlugSignature.ConnTest module for more information.
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with_digest(conn, body_or_digests)

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This function is deprecated. Use PlugBodyDigest.ConnTest.with_digest/2, from the plug_body_digest package.

Add an HTTP Digest header (RFC3230, section 4.3.2).

When the request body is passed in as a binary, a SHA-256 digest of the body is calculated and added as part of the header. Alternatively, a map of digest types and values may be provided.