header questions

The 'jwk' header parameter in a JWT specifies a JSON Web Key (JWK) that represents the key used to sign the token. It is part of the JWT Header and is used in scenarios where the key used for signing or verifying the JWT is shared through a public key infrastructure. By including the 'jwk' parameter, the JWT can provide the necessary information for key discovery and validation, enabling automated key rotation and reducing manual key management efforts.

An Invalid Authentication Header error occurs when the header used for authentication in a request is incorrect or malformed. Ensure that authentication headers are formatted correctly and contain valid credentials. Validate headers on the server side and provide clear error messages for authentication issues.

An Invalid Content-Type error occurs when the Content-Type header in a request does not match the expected type, such as sending JSON data with an incorrect Content-Type. Ensure that the Content-Type header is correctly set to match the request payload and validate it on the server side to handle data appropriately.

Set response headers using `res.set()`. For example: `res.set('Content-Type', 'application/json');` sets the `Content-Type` header. You can also use `res.header()` for similar functionality.