Hi,

I noticed that on a Streaming subscription, the client side receives a "keep alive" envelope (0 notifications with status OK) roughly every 45 seconds (see below). Is this standard behavior?

Thanks, 

 Erez

<Envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/">
  <soap11:Header xmlns:soap11="http://schemas.xmlsoap.org/soap/envelope/">
    <ServerVersionInfo xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" MajorVersion="15" MinorVersion="1" MajorBuildNumber="106" MinorBuildNumber="17" Version="V2_36" xmlns="http://schemas.microsoft.com/exchange/services/2006/types" />
  </soap11:Header>
  <soap11:Body xmlns:soap11="http://schemas.xmlsoap.org/soap/envelope/">
    <m:GetStreamingEventsResponse xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages">
      <m:ResponseMessages>
        <m:GetStreamingEventsResponseMessage ResponseClass="Success">
          <m:ResponseCode>NoError</m:ResponseCode>
          <m:ConnectionStatus>OK</m:ConnectionStatus>
        </m:GetStreamingEventsResponseMessage>
      </m:ResponseMessages>
    </m:GetStreamingEventsResponse>
  </soap11:Body>
</Envelope>

Yes, this is standard.