Automatically closed - issue fixed for 2 weeks with no activity.
Inside http_response_headers.install file, in the line 24, this if operation is wrong:
$strict_transport_security instanceof ResponseHeaderInterface
Is wrong because according PHP documentation http://php.net/manual/en/internals2.opcodes.instanceof.php, When checking instanceof against a class that implements a interface, it will return true.
inside ResponseHeader.php, the class ResponseHeader implements ResponseHeaderInterface
Fixed
Code
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Automatically closed - issue fixed for 2 weeks with no activity.