In general, the module features sending security HTTP headers in a way that better conforms to the standards. For instance, Strict-Transport-Security header should not be sent for plain HTTP requests.
Running curl -IL https://example.com/ will yield the added security headers: HTTP/1.1 200 OK Server: nginx Date: Tue, 21 May 2019 16:15:46 GMT Content-Type: text/html ...
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