HTTP 400 Bad Request vs 500 Internal Server Error
HTTP 400 (Bad Request) is a 4xx Client Error response, while 500 (Internal Server Error) is a 5xx Server Error response. 400 indicates that the server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing. In contrast, 500 means that the server encountered an unexpected condition that prevented it from fulfilling the request. A generic catch-all for server-side errors.
Description
The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
When You See It
When sending malformed JSON, missing required fields, or invalid query parameters.
How to Fix
Check the request body format, validate all required fields, and ensure proper encoding.
Description
The server encountered an unexpected condition that prevented it from fulfilling the request. A generic catch-all for server-side errors.
When You See It
When an unhandled exception occurs, a database connection fails, or server code has a bug.
How to Fix
Check server logs for the stack trace. Common causes: unhandled exceptions, database errors, misconfigurations.
Key Differences
400 is a 4xx Client Error response, while 500 is a 5xx Server Error response.
HTTP 400: The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
HTTP 500: The server encountered an unexpected condition that prevented it from fulfilling the request. A generic catch-all for server-side errors.
You encounter 400 when when sending malformed JSON, missing required fields, or invalid query parameters.
You encounter 500 when when an unhandled exception occurs, a database connection fails, or server code has a bug.
When to Use Which
For 400 (Bad Request): Check the request body format, validate all required fields, and ensure proper encoding. For 500 (Internal Server Error): Check server logs for the stack trace. Common causes: unhandled exceptions, database errors, misconfigurations.