HTTP Status Codes

HTTP status codes are three-digit numbers returned by a server in response to a client's request. They indicate whether the request was successful, redirected, or resulted in an error. Every HTTP response includes exactly one status code.

Status Code Categories

• 1xx Informational: The request was received and the server is continuing to process it. These are provisional responses.
• 2xx Success: The request was received, understood, and accepted successfully.
• 3xx Redirection: Further action is needed to complete the request, typically a redirect to a different URL.
• 4xx Client Error: The request contains bad syntax or cannot be fulfilled. The error is on the client side.
• 5xx Server Error: The server failed to fulfill a valid request. The error is on the server side.

Common Use Cases

• API Development: Choose the correct status code for REST API responses
• Debugging: Understand error responses from servers and APIs
• SEO: Ensure proper redirect codes (301 vs 302) for search engine optimization
• Monitoring: Interpret status codes in server logs and monitoring dashboards

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