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. Retry sending the request, if that results in the same response - 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 correctly formed and 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 meaning 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

Custom HTTP status code - this 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.