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> ## HTTP Responses

> An HTTP response contains a result code, header fields, and a body.

> The HTTP protocol expects the result code and all header fields to be returned before any body content.

> Some commonly used status codes include:

> - `404` - indicates that the requested resource is not available.
> - `401` - indicates that the request requires HTTP authentication.
> - `500` - indicates an error inside the HTTP server which prevented it from fulfilling the request.
> - `503` - indicates that the HTTP server is temporarily overloaded, and unable to handle the request.

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