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Invoke policy property:"Allow list" substitution using context variable

  • 1.  Invoke policy property:"Allow list" substitution using context variable

    Posted Mon March 09, 2026 07:14 AM

    Hi All,

    I would like to check if there is a provision to supply Headercontrol -> Allowlist in API Connect invoke policy using context variables set using gateway script prior to the invoke in API assembly. I tried the option of setting a context variable as shown in screenshots inline. Please let me know if there is any option to achieve dynamic substitution of this property in invoke policy.

    Gateway script :

    Invoke policy : 



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    Atul Mathew George
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  • 2.  RE: Invoke policy property:"Allow list" substitution using context variable

    Posted Mon March 16, 2026 05:15 PM
    Edited by Lorraine Rizzuto Tue March 17, 2026 09:24 AM

    Hi Atul,

    From my understanding, the Header control → Allowlist field in the Invoke policy may not support runtime substitution using context variables like $(allowedheaderlist). The values in this section are typically treated as static configuration and may not resolve variables set through GatewayScript.

    If dynamic control of headers is required, one possible approach could be to handle the header filtering in a GatewayScript policy before the Invoke policy by modifying context.message.headers programmatically.

    However, I have not tested this scenario yet, so it would be good to confirm if others in the community have implemented a similar solution.

    Thanks.



    ------------------------------
    Amutha Karuvelamuthu
    Adaptive Development Private Limited
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