Http Sink Connector retry messages when the service has a long-time response

[NM-Narut]

I have to created sink connector with configuration like this
{
"connector.class": "io.aiven.kafka.connect.http.HttpSinkConnector",
"http.authorization.type": "none",
"tasks.max": "3",
"name": "{{connector-name}}",
"http.url": "{{service-endpoint-url}}",
"auto.commit.interval.ms": "15000",
"heartbeat.interval.ms": "15000",
"value.converter": "org.apache.kafka.connect.storage.StringConverter",
"retry.backoff.ms": "30000",
"http.ssl.trust.all.certs": "true",
"topics.regex": "{{topic-name}}",
"max.poll.interval.ms": "3600000"
}

I reviewed the service response log and observed that the duration ranged between 5 and 10 seconds, then I counted the number of requests and I found the number of requests was more than the number of messages. Assume that if I have 500 messages in Kafka, the number of requests is more than 500 requests and I find some messages will be sent duplicate.

Which config will fix this issue ?

Thank you

[chatchaisi]

I already have this issue when a consumer group is rebalancing.
API Response time around 1-2 sec.

I don't know how to fix this. If you have solution to fix this. Please reply how to resolve it to me.