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The request was well-formed (i.e., syntactically correct) but could not be processed. [1]: §15.5.21 423 Locked (WebDAV; RFC 4918) The resource that is being accessed is locked. [7] 424 Failed Dependency (WebDAV; RFC 4918) The request failed because it depended on another request and that request failed (e.g., a PROPPATCH). [7]
Example scenario: A client on the Internet (cloud on the left) makes a request to a reverse proxy server (red oval in the middle). The proxy inspects the request, determines that it is valid and that it does not have the requested resource in its own cache. It then forwards the request to some internal web server (oval on the right). The ...
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.
Nginx (pronounced "engine x" [8] / ˌ ɛ n dʒ ɪ n ˈ ɛ k s / EN-jin-EKS, stylized as NGINX or nginx) is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. The software was created by Russian developer Igor Sysoev and publicly released in 2004. [9]
The general format of the field is: [2] X-Forwarded-For: client, proxy1, proxy2 where the value is a comma+space separated list of IP addresses, the left-most being the original client, and each successive proxy that passed the request adding the IP address where it received the request from.
This can be due to a misconfiguration or intentional restrictions imposed by the server administrator. Blocked by firewall or security software: A 403 status code can occur if a firewall or security software blocks access to the resource. This may happen due to security policies, malware detection, or other security measures.
"A 'transparent proxy' is a proxy that does not modify the request or response beyond what is required for proxy authentication and identification". "A 'non-transparent proxy' is a proxy that modifies the request or response in order to provide some added service to the user agent, such as group annotation services, media type transformation ...
Diagram of a double POST problem encountered in user agents. Diagram of the double POST problem above being solved by PRG. Post/Redirect/Get (PRG) is a web development design pattern that lets the page shown after a form submission be reloaded, shared, or bookmarked without ill effects, such as submitting the form another time.