Is there a way to enable a disabled event handler on-fly ?

[Earl]

I am writing a test case, and mocking the http client() request using the http_client_options event listener.
But I do not want that event listener always enabled.

Is there a way to keep it off, and turn it on programmatically?

(please change the threat type to Question if a moderator see this post)
Is there a way to enable a disabled event handler on-fly ?

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