robobario commented on code in PR #17967:
URL: https://github.com/apache/kafka/pull/17967#discussion_r1870555818
##########
docs/protocol.html:
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@@ -143,7 +138,13 @@ <h5 class="anchor-heading"><a id="api_versions"
class="anchor-link"></a><a href=
Kafka protocol requests may take place on an SSL listener before the
SSL handshake is finished). If this is considered to
leak information about the broker version a workaround is to use SSL
with client authentication which is performed at an
earlier stage of the connection where the
<code>ApiVersionRequest</code> is not available. Also, note that broker
versions older
- than 0.10.0.0 do not support this API and will either ignore the
request or close connection in response to the request.</li>
+ than 0.10.0.0 do not support this API and will either ignore the
request or close connection in response to the request. Also
+ note that if the client <code>ApiVersionsRequest</code> version is
unsupported by the broker (client is ahead), and the broker
+ version is 2.5.0 or greater, then the broker will respond with a
version 0 <a href="#The_Messages_ApiVersions">ApiVersionsResponse</a>
Review Comment:
pushed up
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