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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
A specific flow to a user agent has failed, although other flows may succeed. This response is intended for use between proxy devices, and should not be seen by an endpoint (and if it is seen by one, should be treated as a 400 Bad Request response). [16]: §11.5 433 Anonymity Disallowed The request has been rejected because it was anonymous. [17]
The request must be completed with a new destination. 4xx: The request cannot be completed at the server for a variety of reasons, including bad request syntax (code 400). 5xx: The server failed to fulfill an apparently valid request, including server internal errors (code 500). 6xx: The request cannot be fulfilled at any server.
A de facto standard for identifying the originating protocol of an HTTP request, since a reverse proxy (or a load balancer) may communicate with a web server using HTTP even if the request to the reverse proxy is HTTPS. An alternative form of the header (X-ProxyUser-Ip) is used by Google clients talking to Google servers.
Consider the following example to illustrate the occurrence of a 502 Bad Gateway error: A user attempts to access a website by entering the URL in their browser. A proxy server first receives the user's request. Acting as an intermediary, the proxy server forwards the request to an upstream server.
If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead.
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A proxy server may reside on the user's local computer, or at any point between the user's computer and destination servers on the Internet. A proxy server that passes unmodified requests and responses is usually called a gateway or sometimes a tunneling proxy. A forward proxy is an Internet-facing proxy used to retrieve data from a wide range ...