What is the difference between status codes 400 and 500?

The 400 (Bad Request) status code indicates that the server cannot process the request due to a client-side error.

Examples:

• Incorrect request syntax.
• Missing required parameters.
• Data in an incorrect format.

The 500 (Internal Server Error) status code indicates that the server encountered an unexpected error that prevented it from fulfilling the request.

Examples:

• Database connection error.
• Error executing server-side code.
• Internal application failures.

Code	Description	Cause	Who is at fault?
400	Bad Request	Client error in request	Client
500	Internal Server Error	Server-side execution error	Server