Hi, "not managing to get the injection to work" doesn't really describe the problem well. What is the output? I assume there's an error with push_header() since that does not appear as a documented method on an HTTP::Response object. Try https://metacpan.org/pod/HTTP::Response#$r-%3Eheader(-$field-=%3E-$value-).
Hope this helps!
The way forward always starts with a minimal test.
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