HTTPCaller Test Request Cache - Bug or Feature?

Hi all,

When sending a test request with a HTTPCaller, the Test Response Preview shows the response. When you close this window and reopen it later after closing and re-opening the workspace (even on another date) this response is still there (cached?). Depending on the URL used, this can lead to an unreasonably large workspace file.

Is this an intended feature, or an oversight that can slow down workspace performance if a user isn’t aware of this?

If there is a benefit to being able to revisit this test response at a later date, maybe it’s a good idea to be able to enable/disable this feature entirely. Or at least be able to ‘clear’ this Test Response Preview.

Kind regards,

Rob de Groot

An example URL that leads to a +20MB size increase of your workspace if a test response preview is opened:

https://services1.arcgis.com/ug8NBKcLHVNmdmdt/arcgis/rest/services/Peilvakken/FeatureServer/0/query?where=1%3D1&outFields=*&outSR=4326&f=json

If you do this for multiple HTTPCallers it can add up quickly and decrease performance significantly.

Tested on FME Form 2024.2 and 2026.1.