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# Using asynchronous request thresholds

For a list of protocols that support asynchronous communication, see 64-bit recording, Async, and IPv6 support.

You can fine-tune some of VuGen's behavior when VuGen scans a Vuser script to locate asynchronous communication. You use VuGen's asynchronous request thresholds to fine-tune VuGen's behavior. Each of the thresholds is associated with only one of the types of asynchronous conversations: push, poll, or long-poll.

- Asynchronous request thresholds for push conversations

  Minimum Response Size. Specify the minimum response content length (in bytes) for defining push asynchronous conversations. If the server sent less than the specified value, VuGen does not classify the conversation as a push-type asynchronous conversation.

  Maximum Sub Message Size. Specify the maximum sub message size (in bytes) sent by the server for defining push asynchronous conversations. If the server sent a sub message of size greater than the specified value, VuGen does not classify the conversation as a push-type asynchronous conversation.

  Minimum Number of Sub Messages. Specify the minimum number of sub messages for defining push asynchronous conversations. A push conversation in which less than the specified number of sub messages was sent by the server is not classified by VuGen as a push-type asynchronous conversation.

- Asynchronous request thresholds for poll conversations

  Interval Tolerance. Specify the interval tolerance (in milliseconds) for classifying poll asynchronous conversations. A conversation in which intervals differ from each other by more than the specified value is not classified by VuGen as a poll-type asynchronous conversation.

- Asynchronous request thresholds for long-poll conversations

  Maximum Interval. Specify the maximum interval (in milliseconds) between the end of one response and the start of a new request for classifying long-poll asynchronous conversations. A conversation in which a request starts more than the specified value after the end of the previous response is not classified by VuGen as a long-poll type asynchronous conversation.

For details on the available asynchronous request thresholds, see Asynchronous Options dialog box.

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