Read Request Variable VI

Returns the value for a single request variable associated with the current HTTP request. Web services include over 30 request variables that provide information such as server label, remote address, and cache control related to an HTTP request.

Note For more information about concepts in this topic, refer to the Web services introduction and tutorial.


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Inputs/Outputs

  • cNI__WebServices_lvlib_Web_Requestlvclass.png LabVIEW Web Service Request —

    LabVIEW Web Service Request is an identifier used by Web Services VIs to reference a specific HTTP request. LabVIEW Web Service Request works similarly to a refnum in LabVIEW, allowing you to wire together Web Services VIs within your application. You must wire Web Services VIs to the LabVIEW Web Service Request control or an existing value from the LabVIEW Web Service Request out terminal of another VI.

    When you use Web Services VI(s) within a Web method VI, you must assign the original LabVIEW Web Service Request control to the connector pane of the Web method VI.

  • cstr.png variable name —

    variable name specifies the request variable from which to return the value. This parameter provides a pull-down menu of available request variables.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • iNI__WebServices_lvlib_Web_Requestlvclass.png LabVIEW Web Service Request out —

    LabVIEW Web Service Request out is an identifier that VIs on the Web Services palette use to reference a specific HTTP request. Use LabVIEW Web Service Request out to wire together Web Services VIs within your application.

  • istr.png value —

    value returns the value of the specified variable.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.