What are status codes? Give examples.
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Status codes are 3-digit numbers returned by a server in response to an HTTP request. They indicate whether the request was successful, resulted in an error, or needs further action. These codes help clients (like browsers or apps) understand what happened on the server side.
🔢 Categories of HTTP Status Codes:
✅ 1xx – Informational
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The request was received, and the process is continuing.
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Example:
100 Continue – The server has received the request headers.
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The request was received, and the process is continuing.
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Example:
100 Continue– The server has received the request headers.
🟢 2xx – Success
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The request was successfully received, understood, and accepted.
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Examples:
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200 OK – The request was successful.
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201 Created – A new resource has been created (e.g., after a POST).
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204 No Content – The request was successful, but there's no content to return.
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The request was successfully received, understood, and accepted.
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Examples:
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200 OK– The request was successful. -
201 Created– A new resource has been created (e.g., after a POST). -
204 No Content– The request was successful, but there's no content to return.
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🟡 3xx – Redirection
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The client must take further action to complete the request.
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Examples:
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301 Moved Permanently – The URL has changed.
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302 Found – Temporary redirection.
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304 Not Modified – The resource hasn't changed since the last request.
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The client must take further action to complete the request.
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Examples:
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301 Moved Permanently– The URL has changed. -
302 Found– Temporary redirection. -
304 Not Modified– The resource hasn't changed since the last request.
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🔴 4xx – Client Error
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There was a problem with the request.
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Examples:
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400 Bad Request – The request is malformed.
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401 Unauthorized – Authentication is required.
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403 Forbidden – Authenticated, but access is denied.
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404 Not Found – The requested resource doesn’t exist.
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There was a problem with the request.
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Examples:
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400 Bad Request– The request is malformed. -
401 Unauthorized– Authentication is required. -
403 Forbidden– Authenticated, but access is denied. -
404 Not Found– The requested resource doesn’t exist.
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🔴 5xx – Server Error
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The server failed to fulfill a valid request.
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Examples:
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500 Internal Server Error – Generic server error.
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502 Bad Gateway – Invalid response from an upstream server.
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503 Service Unavailable – Server is temporarily overloaded or down.
These codes help developers debug and handle API responses properly.
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The server failed to fulfill a valid request.
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Examples:
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500 Internal Server Error– Generic server error. -
502 Bad Gateway– Invalid response from an upstream server. -
503 Service Unavailable– Server is temporarily overloaded or down.
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These codes help developers debug and handle API responses properly.
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