Browse Definitions :
Definition

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.

HTTP has a persistent connection function that allows the channel to remain open rather than be closed after a requested exchange of data. TCP is a connection-oriented protocol: It starts a connection after confirmation from both ends that they are available and open to a data exchange. In a non-persistent connection, the channel closes when one host signals that it wants to end communications or when a certain amount of time has elapsed with no exchange of data. To maintain a persistent connection, TCP keep-alive packets are sent to prevent the connection from timing out.

 An open connection is faster for frequent data exchanges. Communications overhead is saved by leaving a connection open rather than opening and closing sessions for each request. Persistent connections can also be used with APIs to enable servers to push data to clients. Other benefits of persistent connections include reduced network congestion, latency and CPU and memory usage due to the lower number of connections; errors can also be reported without closing the connection.

Persistent connections added for HTTP 1.0 used an extra header to request the client keep the connection alive; HTTP 1.1 assumes all connections to be persistent unless otherwise specified. HTTP 2.0 expands the persistent connection to enable numerous requests and returns of data to be exchanged simultaneously over a single connection.

Persistent connections are also called HTTP keep-alive or HTTP connection reuse.

This was last updated in June 2016

Continue Reading About persistent connection (HTTP persistent connection)

SearchNetworking
  • network security

    Network security encompasses all the steps taken to protect the integrity of a computer network and the data within it.

  • cloud-native network function (CNF)

    A cloud-native network function (CNF) is a service that performs network duties in software, as opposed to purpose-built hardware.

  • Wi-Fi 6E

    Wi-Fi 6E is one variant of the 802.11ax standard.

SearchSecurity
  • incident response

    Incident response is an organized approach to addressing and managing the aftermath of a security breach or cyberattack, also ...

  • MICR (magnetic ink character recognition)

    MICR (magnetic ink character recognition) is a technology invented in the 1950s that's used to verify the legitimacy or ...

  • What is cybersecurity?

    Cybersecurity is the protection of internet-connected systems such as hardware, software and data from cyberthreats.

SearchCIO
  • privacy compliance

    Privacy compliance is a company's accordance with established personal information protection guidelines, specifications or ...

  • contingent workforce

    A contingent workforce is a labor pool whose members are hired by an organization on an on-demand basis.

  • product development (new product development -- NPD)

    Product development, also called new product management, is a series of steps that includes the conceptualization, design, ...

SearchHRSoftware
  • talent acquisition

    Talent acquisition is the strategic process employers use to analyze their long-term talent needs in the context of business ...

  • employee retention

    Employee retention is the organizational goal of keeping productive and talented workers and reducing turnover by fostering a ...

  • hybrid work model

    A hybrid work model is a workforce structure that includes employees who work remotely and those who work on site, in a company's...

SearchCustomerExperience
  • digital marketing

    Digital marketing is a general term for any effort by a company to connect with customers through electronic technology.

  • hockey stick growth

    Hockey stick growth is a growth pattern in a line chart that shows a sudden and extremely rapid growth after a long period of ...

  • Salesforce Trailhead

    Salesforce Trailhead is a series of online tutorials that coach beginner and intermediate developers who need to learn how to ...

Close