Use Curl to troubleshoot Web site performance and time-consuming issues

Example: Use Curl to view all time-consuming information:

$ Curl-o/dev/null-s-W%{time_namelookup}::%{time_connect}::%{time_starttransfer}::%{time_total}::%{speed_ Download} "\ n" "http://www.baidu.com"

0.004::0.008::0.015::0.015::162425.000

The Curl parameter is detailed:

-O: Writes Curl output All label information to the garbage collection station/dev/null

-S: Remove all attributes

-W: Outputs the result according to the expression style provided in the following paragraph

Time_namelookup:dns Resolving the time domain name [www.baidu.com]

Time_commect:client and server end time to establish TCP connections

Time_starttransfer: A request from the client; the server in the Web responds to the first byte of time

Time_total:client sends a request to the Web server to send all the corresponding data time

Speed_download: Download Speed byte/s

0.004:dns the time unit of the server parsing www.baidu.com is s

0.008:client the time that a request is made to C/s to establish TCP, including the time of DNS resolution

0.015:client the time at which the first byte of a response is emitted, including the previous 2 time

0.015:client sends a request, to S to send the response data all to the client, and to turn off the connect time

162425.000: Speed of downloading data

1. Establish a TCP connection to the time that the server returns the first byte of the client: 0.015s-0.008s = 0.007s

2. Time the server sends response data to client: 0.015s-0.015s = 0.0s

This article is from the "Reiling ¿âë¹anti" blog, be sure to keep this source http://luweiv998.blog.51cto.com/4659209/1969224

Use Curl to troubleshoot Web site performance and time-consuming issues