Laravel is a popular PHP framework that provides developers with a wealth of features and tools to create efficient, secure, and reliable web applications. When developing Laravel applications, errors and exceptions are inevitable. In order to better manage these errors and exceptions, Laravel provides a set of error code definitions, which help developers better organize and handle errors, thereby improving the reliability and maintainability of applications.

The following are Laravel's common error codes and their definitions:

1. 1xx Error code: Information error

100 Continue: The server has received the request and does some processing, but still requires the client to send the remaining requests. This status code is for the HTTP/1.1 protocol.

101 Switching Protocols: Indicates that the client wants the server to upgrade the protocol, such as upgrading from HTTP/1.0 to HTTP/1.1.

2. 2xx Error code: Success error

200 OK: Indicates that the request has been successfully processed.

201 Created: Indicates that the request has been successfully processed and the server has created some resources.

202 Accepted: Indicates that the request has been accepted but has not yet been processed by the server.

203 Non-Authoritative Information: Indicates that the server has successfully processed the request, but the returned entity contains some information that is not from the original server.

204 No Content: Indicates that the server has successfully processed the request but did not return any content.

205 Reset Content: Indicates that the server has successfully processed the request, but requires the client to reset the view.

206 Partial Content: Indicates that the server has successfully processed part of the request and returned part of the content.

3. 3xx Error code: Redirect error

300 Multiple Choices: Indicates that the entity returned by the request can be accessed from multiple locations.

301 Moved Permanently: Indicates that the resource has been permanently moved to a new location.

302 Found: Indicates that the resource has been temporarily moved to a new location.

303 See Other: Indicates that the entity returned by the request can be obtained in another URI.

304 Not Modified: Indicates that the resource has not been modified and can be obtained directly from the cache.

307 Temporary Redirect: Similar to 302, but clients using POST requests should not change the request method.

4. 4xx Error code: Client error type error

400 Bad Request: Indicates that the request sent by the client is invalid.

401 Unauthorized: Indicates that the client requires authentication to access resources.

402 Payment Required: Indicates that the requested resources require payment.

403 Forbidden: Indicates that the client does not have permission to access the requested resource.

404 Not Found: Indicates that the requested resource does not exist.

405 Method Not Allowed: Indicates that the client used an HTTP method that is not allowed to access the requested resource.

406 Not Acceptable: Indicates that the requested content type does not match the content type that the server cannot handle.

407 Proxy Authentication Required: Indicates that the client does not have the proxy authentication information required to access the requested resource.

408 Request Timeout: Indicates that the request has timed out.

409 Conflict: Indicates that the request conflicts with the current status of the resource.

410 Gone: Indicates that the requested resource is unavailable, usually because it has been permanently deleted.

411 Length Required: Indicates that the required Content-Length header is missing.

412 Precondition Failed: Indicates that some preconditions given in the request header failed.

413 Payload Too Large: Indicates that the requested entity is too large.

414 URI Too Long: Indicates that the requested URI is too long.

415 Unsupported Media Type: Indicates that the requested entity type is not supported.

416 Range Not Satisfiable: Indicates that the requested range cannot be satisfied.

417 Expectation Failed: Indicates that the request cannot satisfy the Expect request header field in the server.

5. 5xx Error code: Server error type error

500 Internal Server Error: Indicates that the server encountered an error and was unable to complete the request.

501 Not Implemented: Indicates that the server does not support the function requested by the client.

502 Bad Gateway: Indicates that the server received an incorrect response when acting as a gateway or proxy.

503 Service Unavailable: Indicates that the server is currently unable to handle the request, possibly due to maintenance or overload.

504 Gateway Timeout: Indicates that when the server is acting as a gateway or proxy, the response from the upstream server is not received in time.

505 HTTP Version Not Supported: Indicates that the HTTP protocol version used by the client is not supported by the server.

In general, using Laravel's error code definitions can greatly facilitate developers to respond and handle errors and exceptions in Laravel applications in a timely manner, providing efficient and reliable guarantees for applications.

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