![]() ![]() ![]() The 408 error is often referenced in various forms. The 408 error is not to be confused with the server-side 504 error that indicates a server acting as a proxy or gateway did not receive a timely response from the server upstream. There can be various causes for the 408 error, and one in particular, TCP pre-connect, is one of the most common reasons for a timeout (we discuss further below). The 408 error only indicates a lack of request and is not indicative of what particularly happened to it. ![]() The browser reports the 408 error to the client to tell them, “you were too slow to send me a request on this connection, so I closed it.” After this period of time has passed and the request is not received, the proxy closes the connection on behalf of the server. In this instance, the load balancer waits a specified period of time on an open connection for a full request. If a load balancer sits before the server, managing incoming requests and distributing them across the fleet, the load balancer handling the connections can return a 408 error as well. The server can timeout under these conditions, and the client receives the 408 error. The HTTP 408 status code is an error returned by the server when it doesn't receive a timely request from the client. What Does the HTTP 408 Request Timeout Error Mean? In this blog post, we expand upon our 2014 version, delving into what to consider on the HAProxy side when addressing this error. Why did the 408 error appear? What can be done about it? While the error is client-side, the proxy sitting between the client and server can be a player in the timeout. They’re met with the infamous “Error 408 Request Timeout." A client opens their web browser, types in the address, hits enter, and waits-but the request takes too long, and the website doesn’t load. ![]()
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