HTTP keep-alive

HTTP keep-alive is an instruction that allows a single TCP connection to remain open for multiple HTTP requests/responses.

https://www.imperva.com/learn/wp-content/uploads/sites/13/2019/01/keep-alive.jpg

By default, HTTP connections close after each request. Enabling the keep-alive header allows you to serve all web page resources over a single connection.

Configurations

keep-alive must be enabled on your server, followings are configurable

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MaxKeepAliveRequests: maximum number of requests served by a session

KeepAliveTimeout: time a session will last

Reference:

What is HTTP Keep Alive | Benefits of Connection Keep Alive | Imperva

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