arthur-zhang commented on a change in pull request #5038:
URL: https://github.com/apache/apisix/pull/5038#discussion_r707962050
##########
File path: docs/en/latest/plugins/hmac-auth.md
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@@ -192,6 +194,16 @@ print(base64.b64encode(hash.digest()))
| --------- | -------------------------------------------- |
| SIGNATURE | 8XV1GB7Tq23OJcoz6wjqTs4ZLxr9DiLoY4PxzScWGYg= |
+### Request body checking
+
+When `validate_request_body` is assigned to `true`, the plugin will check the
request body. The plugin will calculate the hmac-sha value of the request
body，and check against the `X-HMAC-DIGEST` header.
+
+```
+X-HMAC-DIGEST: base64(hmac-sha(<body>))
+```
+
+When there is no request body, the `X-HMAC-DIGEST` header can be omitted. If
you want to send request with this header whether the body is empty or not, you
can set `X-HMAC-DIGEST` value to the hmac-sha of empty string.
Review comment:
done
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