• 有时候为了测试网络情况，需要返回每个阶段的耗时时间，比如DNS解析耗时，建立连接所消耗的时间，从建立连接到准备传输所使用的时间，从建立连接到传输开始所使用的时间，整个过程耗时，下载的数据量，下载速度，上传数据量，上传速度等等。下面的脚本获取以上信息：

use strict;
use Data::Dumper;
use WWW::Curl::Easy;
if(!@ARGV){
 print "Usaging: $0 url\n";
 print "For example: $0 www.ttlsa.com\n";
 exit;
}
my $curl = new WWW::Curl::Easy;
open my $response_body,">/dev/null";
$curl->setopt(CURLOPT_HEADER,1);
$curl->setopt(CURLOPT_URL, $ARGV[0]);
$curl->setopt(CURLOPT_WRITEDATA,\$response_body);
$curl->perform;
my $err = $curl->errbuf;
if(!$err){
 my $st = &getTime;
 my $http_code = $curl->getinfo(CURLINFO_RESPONSE_CODE);
 my $http_dns_time = $curl->getinfo(CURLINFO_NAMELOOKUP_TIME);
 my $http_conn_time = $curl->getinfo(CURLINFO_CONNECT_TIME);
 #my $http_APP_time = $curl->getinfo(CURLINFO_APPCONNECT_TIME);
 my $http_PRE_TRAN_time = $curl->getinfo(CURLINFO_PRETRANSFER_TIME);
 my $http_START_TRAN_time = $curl->getinfo(CURLINFO_STARTTRANSFER_TIME);
 my $http_TOTAL_time = $curl->getinfo(CURLINFO_TOTAL_TIME);
 my $http_SIZE_DOWN = $curl->getinfo(CURLINFO_SIZE_DOWNLOAD);
 my $http_SPEED_DOWN = $curl->getinfo(CURLINFO_SPEED_DOWNLOAD);
 printf "local_time: %s, http_code: %d, dns_time: %.3fms, conn_time: %.3fms, pre_tran_time: %.3fms, start_tran_time: %.3fms, total_time: %.3fms, size_download: %dB, speed_download: %dB/s",($st,$http_code,$http_dns_time,$http_conn_time,$http_PRE_TRAN_time,$http_START_TRAN_time,$http_TOTAL_time,$http_SIZE_DOWN,$http_SPEED_DOWN);
 write;
 format STDOUT_TOP=
 站点各类响应时间明细-@||
 $%
 =========================
 +---------------------+------+-------------+--------------+--------------------------+------------------------+-------------+-----------+------------+
 | 本地时间 | 状态 | DNS解析时间 | 建立连接时间 | 从建立连接到准备传输时间 |从建立连接到开始传输时间| 整个过程时间| 下载数据量|平均下载速度|
 +---------------------+------+-------------+--------------+--------------------------+------------------------+-------------+-----------+------------+
 .
 format STDOUT=
 |@<<<<<<<<<<<<<<<<<<<<| @<<<<| @<<<<<<<<<<<| @<<<<<<<<<<<<| @<<<<<<<<<<<<<<<<<<<<<<<<| @<<<<<<<<<<<<<<<<<<<<<<| @<<<<<<<<<<<| @<<<<<<<<<| @<<<<<<<<<<|
 $st,$http_code,$http_dns_time."ms",$http_conn_time."ms",$http_PRE_TRAN_time."ms",$http_START_TRAN_time."ms",$http_TOTAL_time."ms",$http_SIZE_DOWN."B",$http_SPEED_DOWN."B/s"
 +---------------------+------+-------------+--------------+--------------------------+------------------------+--------------+----------+------------+
 .
}else{
 print "Error: $err\n";
}
sub getTime()
{
 my @time=(localtime)[5,4,3,2,1,0];
 $time[0]+=1900;
 $time[1]+=1;
 return sprintf("%04u-%02u-%02u %02u:%02u:%02u",@time);
}

• 结果如下：

  
  
  image.png

shell命令下也有相同的命令如下所示：

curl -o /dev/null -s -w %{http_code}:%{http_connect}:%{time_namelookup}:%{time_connect}:%{time_pretransfer}:%{time_starttransfer}:%{time_total}:%{size_download}:%{speed_download}  https://www.55book.com 

使用 cURL 获取站点的各类响应时间 – dns解析时间,响应时间,传输时间

curl -o /dev/null -s -w %{http_code}:%{http_connect}:%{content_type}:%{time_namelookup}:%{time_redirect}:%{time_pretransfer}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download} digdeeply.org 

以下是可用的变量名：

　-w, --write-out 
　以下变量会按CURL认为合适的格式输出，输出变量需要按照%{variable_name}的格式，如果需要输出%，double一下即可，即%%，同时，\n是换行，\r是回车，\t是TAB。 

url_effective The URL that was fetched last. This is most meaningful if you've told curl to follow location: headers. 

filename_effective The ultimate filename that curl writes out to. This is only meaningful if curl is told to write to a file with the --remote-name or --output option. It's most useful in combination with the --remote-header-name option. (Added in 7.25.1) 

http_code http状态码，如200成功,301转向,404未找到,500服务器错误等。(The numerical response code that was found in the last retrieved HTTP(S) or FTP(s) transfer. In 7.18.2 the alias response_code was added to show the same info.) 

http_connect The numerical code that was found in the last response (from a proxy) to a curl CONNECT request. (Added in 7.12.4) 

time_total 总时间，按秒计。精确到小数点后三位。 （The total time, in seconds, that the full operation lasted. The time will be displayed with millisecond resolution.） 

time_namelookup DNS解析时间,从请求开始到DNS解析完毕所用时间。(The time, in seconds, it took from the start until the name resolving was completed.) 

time_connect 连接时间,从开始到建立TCP连接完成所用时间,包括前边DNS解析时间，如果需要单纯的得到连接时间，用这个time_connect时间减去前边time_namelookup时间。以下同理，不再赘述。(The time, in seconds, it took from the start until the TCP connect to the remote host (or proxy) was completed.) 

time_appconnect 连接建立完成时间，如SSL/SSH等建立连接或者完成三次握手时间。(The time, in seconds, it took from the start until the SSL/SSH/etc connect/handshake to the remote host was completed. (Added in 7.19.0)) 

time_pretransfer 从开始到准备传输的时间。(The time, in seconds, it took from the start until the file transfer was just about to begin. This includes all pre-transfer commands and negotiations that are specific to the particular protocol(s) involved.) 

time_redirect 重定向时间，包括到最后一次传输前的几次重定向的DNS解析，连接，预传输，传输时间。(The time, in seconds, it took for all redirection steps include name lookup, connect, pretransfer and transfer before the final transaction was started. time_redirect shows the complete execution time for multiple redirections. (Added in 7.12.3)) 

time_starttransfer 开始传输时间。在发出请求之后，Web 服务器返回数据的第一个字节所用的时间(The time, in seconds, it took from the start until the first byte was just about to be transferred. This includes time_pretransfer and also the time the server needed to calculate the result.) 

size_download 下载大小。(The total amount of bytes that were downloaded.) 

size_upload 上传大小。(The total amount of bytes that were uploaded.) 

size_header 下载的header的大小(The total amount of bytes of the downloaded headers.) 

size_request 请求的大小。(The total amount of bytes that were sent in the HTTP request.) 

speed_download 下载速度，单位-字节每秒。(The average download speed that curl measured for the complete download. Bytes per second.) 

speed_upload 上传速度,单位-字节每秒。(The average upload speed that curl measured for the complete upload. Bytes per second.) 

content_type 就是content-Type，不用多说了，这是一个访问我博客首页返回的结果示例(text/html; charset=UTF-8)；(The Content-Type of the requested document, if there was any.) 

num_connects Number of new connects made in the recent transfer. (Added in 7.12.3) 

num_redirects Number of redirects that were followed in the request. (Added in 7.12.3) 

redirect_url When a HTTP request was made without -L to follow redirects, this variable will show the actual URL a redirect would take you to. (Added in 7.18.2) 

ftp_entry_path The initial path libcurl ended up in when logging on to the remote FTP server. (Added in 7.15.4) 

ssl_verify_result ssl认证结果，返回0表示认证成功。( The result of the SSL peer certificate verification that was requested. 0 means the verification was successful. (Added in 7.19.0))