The Kafka 2.2 javadocs link mentioned in the Apache Kafka API documentation (http://kafka.apache.org/documentation/#producerapi) errors out and gives a 404 Not Found error. Below is the link which is mentioned in the documentation:
I don't see javadoc folder within https://kafka.apache.org/22/
This error is not present in Kafka 2.1 or previous documentation.
Attaching screenshot for reference.