HTTP status codes are three-digit numbers that are returned by a server in response to an HTTP request. They indicate the outcome of the request and provide additional information about the status of the resource.
Here are some of the most common and important HTTP status codes:
- 200 OK: Indicates that the request was successful and the server has returned the requested resource.
- 201 Created: Indicates that a new resource was successfully created as a result of the request. This status code is typically used when creating a new resource, such as a new user account or a new blog post.
- 204 No Content: Indicates that the request was successful but the server has not returned any content. This status code is typically used when a request results in an update to a resource, such as when a user updates their profile information.
- 400 Bad Request: Indicates that the request was malformed or invalid. This status code is typically used when the server is unable to understand the request due to missing or invalid parameters.
- 401 Unauthorized: Indicates that the request requires authentication and the client did not provide valid credentials. This status code is typically used when a user tries to access a protected resource without providing valid login credentials.
- 403 Forbidden: Indicates that the client does not have permission