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# Asynchronous Options dialog box

This dialog box enables you to fine-tune some of VuGen's behavior when VuGen scans a Vuser script to locate asynchronous communication.

To access, click Record > Recording Options > General > Code Generation and then click Async Options.

User interface elements are described below:

UI Element | Description
--- | ---
Minimum Response Size | Specify the minimum size (in kilobytes) of a server response 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 kilobytes) 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 valid sub messages for defining push asynchronous conversations. A push conversation in which less than the specified number of valid sub messages was sent by the server is not classified by VuGen as a push-type asynchronous conversation.
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.
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.

Asynchronous Regular Expressions Table

UI Element | Description
--- | ---
<Activate Rule> | A check box indicating whether or not the rule is activated. To select all rules, select the check box in the toolbar.
Rule Type | Push, Poll, and Long Poll are positive asynchronous rules. Not Async is a negative rule. For details on the asynchronous rule types, see Async rules overview.
Regular Expression | A regular expression for URLs that should be considered part of asynchronous conversations. For a list of the special characters that you can include in a regular expression, see Add Async rules.

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