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ab: Use HTTP [K]eep Alive, i.e. perform multiple requests within one HTTP session.
$ ab -k ${url}
try on your machine

The command "ab -k ${url}" is used to run the ApacheBench (ab) command-line tool with the "-k" flag followed by the value of the "url" variable.

  • ApacheBench is a popular benchmarking tool for measuring the performance of web servers. It allows you to send a specified number of requests to a specified URL and measure various metrics like requests per second, time per request, etc.

  • The "-k" flag in the command stands for "keep-alive" and enables the HTTP keep-alive feature. This means that the tool will reuse the same TCP connection for multiple requests instead of establishing a new connection for each request. This can improve performance when making multiple requests to the same server.

  • The "${url}" is a placeholder for the actual URL that you want to test. In the command, the value of the "url" variable should be substituted. For example, if the variable is set to "", then the command will be executed with "ab -k".

Overall, this command runs ApacheBench with keep-alive enabled and tests the performance of the specified URL.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.
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