Header 'via' cannot be modified with operation 'remove' (Code: undefined)

None of the operations works when i want to modify via header, Why ?

header ‘via’ cannot be modified with operation ‘remove’ (Code: undefined)
header ‘via’ cannot be modified with operation ‘set’ (Code: undefined)
Filter parsing error (1:1): test ^^^^ unknown identifier (Code: undefined)

This simply means that the via header is immutable - Cloudflare does not allow you to manipulate the via header in any way.

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