What information is usually transmitted through middleware?

Middleware typically transmits the following information:

• Request and response data — for example, HTTP headers, request body, parameters.
• Authentication and authorization information — tokens, cookies, sessions.
• Execution context — user data, localization, settings.
• Logs and metrics — for monitoring and debugging.
• Status information — for example, session or transaction data.

Middleware acts as an intermediary layer between the client and server or between application components, providing data processing, transformation, or routing.