persistent connection (HTTP persistent connection): A persistent connection ( HTTP persistent connection) is a network communication channel that remains open for further HTTP requests and responses rather than closing after a single exchange.
You are using HTTP/1.1 and you are specifying Connection: keep-alive. Under HTTP/1.1 all connections are keep-alive by default, and the Connection: keep-alive header has been deprecated, so you should not send it. Connection: keep-alive is a little hack used back in the so-called HTTP/1.0+ days. (The + stands for "hacks necessary to get it to Without a keep-alive, every HTTP request has to establish a new TCP connection, and then close the connection once the response has been sent/received. A keep-alive allows an existing TCP connection to be re-used for multiple requests/responses, thus avoiding all of that overhead. That is what makes the connection "persistent". Reusing Connections with Keep-Alive in Node.js By default, the default Node.js HTTP/HTTPS agent creates a new TCP connection for every new request. To avoid the cost of establishing a new connection, you can reuse an existing connection. The Connection: Keep-Alive header must be sent with all messages that want to continue the persistence. If the client does not send a Connection: Keep-Alive header, the server will close the connection after that request. Clients can tell if the server will close the connection after the response by detecting the absence of the Connection: Keep HTTP persistent connections, also called HTTP keep-alive, or HTTP connection reuse, is the idea of using the same TCP connection to send and receive multiple HTTP requests/responses, as opposed to opening a new one for every single request/response pair. Using persistent connections is very important for improving HTTP performance. Client keep-alive resolves this issue by keeping the connection between the client and the appliance (client-side connection) open even after the server closes the connection with the appliance. This allows sending multiple client requests using a single connection and saves the round trips associated with opening and closing a connection. A Keep-Alive header is defined for HTTP. This hop-by-hop header informs hosts about connection management policies. Parameters are defined for idle connection timeout and maximum request count.
Re: exceeding HTTP Keep-Alive timeout I'm pretty sure each time these meter reader things send data that they will be using a new TCP connection every time. I can't see how it would re-use the same socket over such a long period.
Nov 14, 2014 · "Proxy-Connection: keep alive" - how do I stop this from printing on its own every few minutes? 01-09-2015 05:33 PM I tried everything including what you and someone else said to do, and I also deleted the printer and reinstalled it and it's still doing it.
The impact of not having persistent connections is a major increase in loading time of resources. With keep-alive, a single TCP connection can be used to request multiple resources; without, a new TCP session (with a new three-way handshake - and, if you use SSL, a new SSL negotiation) is required for each and every resource on the page.
Keep-Alive (also known as HTTP Keep-Alive or persistent connection) is a bit of communication (message) between the client and server that says: “You may grab many files.” These are extremely small messages that consume very little bandwidth. Jul 12, 2015 · Keep alive is a method to allow the same tcp connection for HTTP conversation instead of opening a new one with each new request. More simply put, it is a communication between the web server and the web browser that says "you can grab more than just one file at a time". Feb 06, 2017 · Showing Connection header keep-alive and closed for HTTP/1.1 and HTTP/1.0 respectively The good thing is that most modern browsers will use persistent HTTP connections as long as servers comply. This means if you are building a web application, enabling persistent/keep-alive connections will help improve the performance.