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Asked: 2026-06-13T11:21:53+00:00

There doesn’t seem to be much information around on forcing Cookie values in JMeter

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There doesn’t seem to be much information around on forcing Cookie values in JMeter (2.8).

I’d like to be able to set a cookie at the start of a thread (AWS LoadBalancer ID), so that i can select a specific ID each time. The reason for this is that AWS gives the same ELB ID every time unless you change IP. I want to test more than one.

I have tried setting user-defined cookies in the HTTP Cookie Manager without success. (nothing is added)

I have also tried adding a COOKIE_Test to HTTP Header Manager without success. (adds to the header but doesn’t treat as cookie)

Might not be possible?

Update: Adding the domain entry fixed it…
On inspecting the normal set-cookie, it omitted the domain, so i did the same…
I guess Cookie Manager ignores and user-defined cookies with null values.

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1 Answer

  1. Editorial Team

    Adding the domain entry fixed it

    On inspecting the normal set-cookie, it omitted the domain, so i did the same…

    Cookie Manager ignores any user-defined cookies with null values.

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