HTTP Headers (free)
The HTTP Headers add-on allows you to add extra response headers. These headers are meant to provide additional information. For example to return what the name of the server was, whether the response should be cached, what kind of data is returned, etc.
With HTTP Headers you can control some security related headers, such as the CSP (Content Security Policy) header. It's an add-on meant for advanced users, but it works really easy.
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