Curl Command Test Web Response

Case of the Curl command: output is usually HTML code, sent to the/dev/null.-s parameter with the-o parameter to remove all state information.-W parameter lets curl output timer state information


Time_connect: The time taken to establish a TCP connection to the server
Time_starttransfer: The time it takes for the WEB server to return the first byte of data after a request is made
Time_Total: Time spent completing the request


[Root@localhost ~]# Curl-o/dev/null-s-W%{time_connect}:%{time_starttransfer}:%{time_total} http://www.test.com/


0.013:0.016:0.359


These timers are relative to the start time of the transaction, even before the Domain Name Service (DNS) query. Therefore, after the request is made,
The time spent by the WEB server processing the request and starting to send back data is 0.016–00.013 = 0.003 seconds.
The time the client downloaded the data from the server was 0.359–0.016 = 0.343 seconds.


By observing the curl data and its changing trend over time, it is possible to understand the responsiveness of the site to users.


Of course, the Web site is not just made up of pages. It also has images, JavaScript code, CSS, and cookies to deal with.
Curl is good for understanding the response time of a single element, but sometimes you need to know the load speed of the entire page.