Explanation of Common 4XX HTTP Status Codes

Status Code Meaning Scenario
400 Syntax Error Invalid request structure, such as incorrect JSON format, etc.
403 Insufficient Permissions User does not have permission to perform the operation
404 Resource Not Found Requested data does not exist, etc.
422 The server understands the type of the request entity and the syntax is correct, but it cannot process the contained instructions or data The request structure is valid but field types/format do not meet requirements;Required fields are missing;Business logic constraints cannot be executed (e.g., attempting to create a user that already exists)

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