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What are some of the best practices for delivering high-quality work on Fiverr as a freelancer?

What are 3xx, 4xx, and 5xx HTTP codes for redirection?

Here only 3XX HTTPS codes are a redirection, 4XX codes are Client Error and 5XX codes are Server Errors.

3XX Redirections

300: Multiple Choices: A link list. The user can select a link and go to that location. Maximum five addresses.

301: Moved Permanently: The requested page has moved to a new URL.

302: Found: The requested page has moved temporarily to a new URL.

303: See Other: The requested page can be found under a different URL.

304: Not Modified: This is the response code to an If-Modified-Since or If-None-Match header, where the URL has not been modified since the specified date.

305: Use Proxy: The requested URL must be accessed through the proxy mentioned in the Location header.

306: Unused: This code was used in a previous version. It is no longer used, but the code is reserved.

307: Temporary Redirect: The requested page has moved temporarily to a new URL.

4XX Error Codes (Client Error Codes)

400: Bad Request: The server did not understand the request.

401: Unauthorized: The requested page needs a username and a password.

402: Payment Required: You can not use this code yet.

403: Forbidden: Access is forbidden to the requested page.

404: Not Found: The server can not find the requested page.

405: Method Not Allowed: The method specified in the request is not allowed.

406: Not Acceptable: The server can only generate a response that is not accepted by the client.

407: Proxy Authentication Required: You must authenticate with a proxy server before this request can be served.

408: Request Timeout: The request took longer than the server was prepared to wait.

409: Conflict: The request could not be completed because of a conflict.

410: Gone: The requested page is no longer available.

411: Length Required: "Content-Length" is not defined. The server will not accept the request without it.

412: Precondition Failed: The precondition given in the request evaluated to false by the server.

413: Request Entity Too Large: The server will not accept the request, because the request entity is too large.

414: Request-URL Too Long: The server will not accept the request, because the URL is too long. Occurs when you convert a "post" request to a "get" request with long query information.

415: Unsupported Media Type: The server will not accept the request because the media type is not supported.

416: Requested Range Not Satisfiable: The requested byte range is not available and is out of bounds.

417: Expectation Failed: The expectation given in an Expect request-header field could not be met by this server.

5XX Error Codes (Server Error Codes)

500: Internal Server Error: The request was not completed. The server met an unexpected condition.

501: Not Implemented: The request was not completed. The server did not support the functionality required.

502: Bad Gateway: The request was not completed. The server received an invalid response from the upstream server.

503: Service Unavailable: The request was not completed. The server is temporarily overloading or down.

504: Gateway Timeout: The gateway has timed out.

505: HTTP Version Not Supported: The server does not support the "HTTP protocol" version.