HTTP(S) response codes

Error	Description
400 - Bad request	The proxy server can return this error code if the request did not contain a host to connect to or there was a generic error when parsing the HTTP request. Make sure your request is correctly formed. Include the URL in the request, and then try again.
401 - Unauthorized error	The proxy server returns this error when your request fails authentication on the target website. Make sure that you provide correct authentication information for the website alongside the request.
403 - Forbidden	The proxy server returns this error when its access to the target website has been blocked. Please try using a different proxy server location or ports.
404 - Not Found	The server could not find the requested resources. Usually thrown when requesting a broken/dead link. Make sure you did not mistype the link.
408 - Request Timeout	The requested server has closed the connection due to a timeout, whatever the value is set at. Try sending the request again. If the issue persists, try changing the endpoint or session type for your request.
407 - Proxy Authentication Required	Request lacks proxy authentication information, or username or password is invalid. Include Proxy authentication header in your request, and make sure your username and password are formed correctly. Then, try again.
500 - Internal Server Error	The proxy server has encountered an internal error. Retry request at a later time.
502 - Bad Gateway	The proxy server received an invalid response from the upstream server. Retry request.
503 - Service Unavailable	Usually means that the server (which in this context can mean either the proxy server or the targeted resource) is currently down or heavily overloaded and cannot provide a normal response. Retry your request, check whether your targeted resource is not under maintenance.
504 - Gateway Timeout	The proxy server did not receive a response from the upstream server in time. Retry request.
522 - CONNECT Timeout	The custom HTTP status code means that the proxy connection timed out during the CONNECT phase.
525 - No Exit Found	Custom HTTP status code means proxy was unable to find an exit node that satisfies the request. Change request filter parameters or try again at a later time.

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