An organization hosted a website to provide services to its customers. A visitor of this website has reported a complaint to the organization that they are getting an HTTP error message with code…

An organization hosted a website to provide services to its customers. A visitor of this website has reported a complaint to the organization that they are getting an HTTP error message with code 502 while accessing the organization's website. The organization's IT staff has verified that the problem is not with the internet connection and the problem is with the web server. The IT staff explained that this is an HTTP error indicating that the server acted as a gateway or proxy and received an invalid response from the upstream server. The IT staff also explained to the visitor that it might be caused by an invalid response from an upstream server or by an overloaded server or an incorrectly configured firewall. The IT staff is working towards resolving the issue by checking whether the server is overloaded, whether the name resolution is working properly, whether the firewall is misconfigured properly. Identify the error message corresponding to code 502 that the visitors obtained when they tried to access the organization's website?