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https://issues.apache.org/jira/browse/KAFKA-10507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17199628#comment-17199628
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David Jacot commented on KAFKA-10507:
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That would make sense for the Java client cause it sends another
ApiVersionsRequest. However, i think that other clients such as librdkafka may
expect to get the full list of APIs directly. If I remember correctly,
librdkafka sends only one ApiVersionsRequest regardless of the authentication
mechanism used.
> Limit the set of APIs returned in pre-authentication ApiVersions
> -----------------------------------------------------------------
>
> Key: KAFKA-10507
> URL: https://issues.apache.org/jira/browse/KAFKA-10507
> Project: Kafka
> Issue Type: Improvement
> Reporter: Jason Gustafson
> Priority: Major
>
> We use the ApiVersions RPC to check whether the SaslHandshake and
> SaslAuthenticate APIs are supported before authenticating with the broker.
> Currently the response contains all APIs supported by the broker. It seems
> like a good idea to reduce the set of APIs returned at this level to only
> those which are supported prior to authentication.
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