The benefit of raising an exception over `return`ing a value will be more evident in the section about Dependencies and Security.

In this example, when the client requests an item by an ID that doesn't exist, raise an exception with a status code of `404`:

### Always `raise` in Dependencies with `yield` and `except`

If you catch an exception in a dependency with `yield`, unless you are raising another `HTTPException` or similar, you should re-raise the original exception.

*   Fixes vulnerabilities arising from incomplete validation in MKL
    requantization
    ([CVE-2021-37665](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37665))
*   Fixes an undefined behavior arising from reference binding to nullptr in
    `RaggedTensorToVariant`
    ([CVE-2021-37666](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37666))
*   Fixes an undefined behavior arising from reference binding to nullptr in

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aead.dev/mem
https://aead.dev/mem

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