We're in the process of switching over to AM 4.0, and ran into Bug
847364. The docs say there is no workaround, but I'm hoping someone can
point me in a direction for a workaround that might exist now.

The docs for 4.0 say:

3.11 403 Error Occurs When URLs Contain %0A

Issue: A 403 permission denied error occurs when URLs query string
contains %0A character. (Bug 847364)

Workaround: None.

Any suggestions? (Or a way to obtain an FTF?)

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