Table of Contents
What does HTTP KeepAlive do?
The HTTP keep-alive header maintains a connection between a client and your server, reducing the time needed to serve files. A persistent connection also reduces the number of TCP and SSL/TLS connection requests, leading to a drop in round trip time (RTT).
What is client Keep-Alive?
The Client Keep-Alive mode enables the Citrix ADC appliance to process multiple requests and responses using the same socket connection. The feature keeps the connection between the client and the appliance (client-side connection) open even after the server closes the connection with the appliance.
How do you use Keep-Alive?
Use “KeepAlive On” to enable it. To disable, just use “KeepAlive Off”. It sets the maximum number of requests for every Keep-Alive connection. A value of 100 is normally good enough for almost any scenario.
What is keepalive in TCP?
The TCP Keepalive Timer feature provides a mechanism to identify dead connections. When a TCP connection on a routing device is idle for too long, the device sends a TCP keepalive packet to the peer with only the Acknowledgment (ACK) flag turned on.
How do I enable HTTP Keep-Alive response headers?
How to enable keep-alive connections
- Edit or create an . htaccess file in your site’s document root directory.
- Copy the following lines and paste them into the .htaccess file: Header set Connection keep-alive
- Save your changes to the . htaccess file.
Is TCP Keepalive enabled?
TCP keepalive is a TCP option that causes packets to be exchanged over a connection even if there is no traffic to transport. It should be enabled on both ends of the connection. TCP keepalive must be enabled at the operating-system level *and* by the application/program opening TCP connections.
What is keepalive in Cisco switch?
Description. The keepalive command specifies the interval (in seconds ) that the router waits before sending a message on the interface to test the link and determine whether it is up or down. On Ethernet interfaces, the router sends the message to itself.
What is Keep-Alive in Cisco switch?
What is standalone Keep-Alive service?
A keepalive is a signal sent from one device to another to maintain a connection between the two devices. This may be between a client and a server, but it could apply to any number of devices or technologies.
What is keepalive header?
The Keep-Alive header is a general-type header. This header is used to hint at how the connection may be used to set a timeout and a maximum amount of requests. It can also be used to allow a single TCP connection to remain open for multiple HTTP requests/responses (default HTTP connection closed after each request).
What is keep-alive in http?
An application uses KeepAlive to indicate a preference for persistent connections. When the KeepAlive property is true, the application makes persistent connections to the servers that support them. When using HTTP/1.1, Keep-Alive is on by default. Setting KeepAlive to false may result in sending a Connection: Close header to the server.
How long a httpclient connection can be kept alive?
By default, if an HttpClient does not receive a Keep-Alive header from a response it gets from a server, it assumes its connection to that server can be kept alive indefinitely, and will keep that connection in it’s PoolingHttpClientConnectionManager indefinitely.
Does the keep-alive strategy idle the httpclient connection?
I just tested this and confirmed that the Keep-Alive strategy will only idle connections from the HttpClient’s connection pool after the Keep-Alive duration has passed.
Is it possible to reuse connections in httpclient?
From hc.apache.org : HttpClient always does its best to reuse connections. Connection persistence is enabled by default and requires no configuration. Under some situations this can lead to leaked connections and therefore lost resources.