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Authorization

The credential: Bearer tokens, Basic auth. The header that must never end up in logs or URLs.

request header
Example
Authorization: Bearer eyJhbGciOi…
What it does
The credential: Bearer tokens, Basic auth. The header that must never end up in logs or URLs.
In practice
Two practical traps. Proxies and CDNs often strip or refuse to cache anything carrying it (correctly — a cached authorised response is a data leak). And cross-origin redirects drop it: if your API moved domains and auth mysteriously fails, the client followed a redirect and the header did not.

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