Connection keep alive

Average time with new connections: If the intermediary or server holding the other end of the connection chooses to close the connection while a non-idempotent request is in transit, the client has no way to tell if the request has succeeded. Keep-alive is only for client, server and any other intermediate session-aware devices. How much this affects the server's availability and how long the resources are unavailable depend on the server's architecture and configuration. Keep-alive connections allow the client and server to use the same TCP connection to send and receive multiple HTTP requests and responses.

Uploader: Tolrajas
Date Added: 24 May 2015
File Size: 26.4 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 54533
Price: Free* [*Free Regsitration Required]

But this mechanism is very inefficient, especially with complex web pages that have a large number of elements. Some HTTP implementations already provide an implementation for this header.

Once the specified number of requests and responses have been sent, the host that included the parameter could close the connection. The maximum request count does not apply to the upgraded connection; the upgrade request and subsequent exchange are regarded as a single HTTP request.

If you do not have access to your webserver config file you can enable keep-alive yourself using an. Keep-Alive must be enabled automatically with every fresh Apache server installation. See HTTP persistent connection for some advantages and disadvantages, such as:. A server, client or intermediary might apply different policies to an upgraded protocol.

Adding this code to your. A network address translation NAT device or other middlebox might cause a connection to become unavailable prior to the advertised timeout. Retrieved from " https: We can actually check this difference using telnet. This small experiment got me really excited about tuning my applications and improving conection by understanding more about the underlying network protocols.

HTTP persistent connection

You can also see this in action. Where does this info is kept "this connection belongs to "Royi"?

Thu, 15 Jan You need to pay close attention to the default behavior of HTTP libraries as well. Does it mean that no one else can use that connection That is the intention of TCP connections: StackPath Blog What is an Abuse desk?

This hop-by-hop header informs hosts about connection management policies. Connrction this example shows, the timeout policies maintained by the proxy are different for each connection.

Check your application and proxy server configurations to make sure that they support Keep-Alive. Any extension that is not understood MUST be ignored. The max header parameter indicates the maximum number of requests that will be permitted before the connection is closed. The values might be set based on policy implemented by servers, clients and intermediaries. Otherwise, the server has to open a new connection for every request.

Hosts are able to close idle connections in order to reduce resource consumption.

http - Keep-alive header clarification - Stack Overflow

If you see this make sure you know why it is disabling keep-alive before removing. There is a brief communication where the browser asks for xlive file and the web server says yes or no. Interested in transitioning to a career in data engineering? All modern browsers use persistent connections as long as the donnection is willing to cooperate. The ability to serve multiple files using the same connection can reduce latency and allow web pages to load faster.

Persistent connections

Does it mean that no one else can use that connection If so - does it mean that keep alive-header - reduce the number of overlapped connection users? The value of zlive timeout parameter is a single integer in seconds.

May 24, What is DDoS? Unless you are indeed a very high traffic site you can and probably should disable smart keep alive in the config and once you do so all of your connections will use keep alive.

3 thoughts on “Connection keep alive”

Leave a Reply

Your email address will not be published. Required fields are marked *