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Update deprecated headers Expect-CT and Public-Key-Pins information #1023

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Jan 2, 2023
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Update deprecated headers Expect-CT and Public-Key-Pins information #1023

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9 changes: 4 additions & 5 deletions cheatsheets/HTTP_Headers_Cheat_Sheet.md
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Expand Up @@ -80,16 +80,15 @@ Enable HTTPS-only access for the site and sub domains.

Please checkout [HTTP Strict Transport Security Cheat Sheet](HTTP_Strict_Transport_Security_Cheat_Sheet.md) for more information.

### Expect-CT
### Expect-CT ❌

The `Expect-CT` header lets sites opt-in to reporting of Certificate Transparency (CT) requirements. Given that mainstream clients now require CT qualification, the only remaining value is reporting such occurrences to the nominated report-uri value in the header. The header is now less about enforcement and more about detection/reporting.

Please note Mozilla states that [this header will be obsolete](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect-CT) in June 2021.
Please note that according to Mozilla, [this header is deprecated](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect-CT) since June 2021.

#### Recommendation

Set Certificate Transparency so user agents report Expect-CT failures.
> `Expect-CT: max-age=604800, report-uri="https://foo.example/report"`
Avoid using this header and update existing code by removing it.

### Content-Security-Policy

Expand Down Expand Up @@ -203,7 +202,7 @@ The HTTP `Public-Key-Pins` response header is used to associate a specific crypt

#### Recommendation

This header is deprecated. Use `Expect-CT` instead.
This header is deprecated and should not be used anymore.

## Adding HTTP Headers in Different Technologies

Expand Down