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I am accessing Salesforce Live Agent through REST API. I can create session and send messages from the client. for getting the messages from the server I set timer in client, and each 1.5 seconds I send the request "Messages" to server.

while there is no message from the server, I get the error "Duplicate Message Observer" with statusCode 409.

Why is it happens? Is there any way to avoid the errors?

Thanks.

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I believe this occurs when you have more than 1 concurrent message request to Salesforce at once. It is a long-polling mechanism, so you must wait until you receive a response before starting a new message request.

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