It’s most often a network error on an external network. The one thing you need to remember if you see a 504 error is that it isn’t usually your browser or your computer.
Web server simply too busy to respond in time. Data mismatch between the IP address of the proxy and the IP address of the web server. Fault with the link between the web server and the network. It could be a number of things, including: So, you now know how the basic server architecture works, what could cause a proxy to not be able to communicate with a web server? They can divide networks along with routers, keeping internal IP addresses private while allowing the public to access web servers. They can act as mini VPNs, adding a layer of privacy to communications. They work as load balancers, dividing traffic across multiple network servers. They act as gatekeeper to networks and will often run firewalls that work alongside network appliances for defense in depth. 
It’s a catch-all name for servers that can perform several functions: Proxy servers are used a lot in networking. If the server doesn’t respond in time, the proxy flags an HTTP error. If it responds in time, it’s all good and your web page loads. Once an HTTP query is sent, there is a finite amount of time for the web server to respond. To help keep the internet flowing, HTTP has a timer built into it. If the proxy cannot contact your web server for any reason, it will return an HTTP 504 error to your browser. When everything works well, this process is seamless and takes a second or two. The proxy will look up the IP address or domain, find the physical server and route the traffic to the web server that hosts your website.Every visitor to your website will land on this proxy server. Your host will have a proxy server that handles requests and then forwards them on to your web server.
The browser queries DNS and is directed towards your web host so it can deliver a copy of the requested web page. What you don’t see is the process behind that query from your browser.Īll web queries will work a little like this: It’s like magic, type in the URL, wait a second or two and the page loads. You type in a URL in your browser, there’s a pause and then the website appears. It is caused by a proxy or gateway server not receiving a response from the server that hosts your website. The WordPress 504 gateway timeout error is an HTTP error.
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