使用curl进行网络诊断

Z5j%JZ@%y6x0   我们使用浏览器插件，很容易查看到网页细分请求消耗的时间。如Firefox的Firebug插件：51Testing软件测试网kx^t LRz@(sr T|

'sEkf_/k!m051Testing软件测试网4ytR)b0W/`4d2iO
Linux的命令行怎样实现类似功能呢？curl即可实现：

|0`EXf+i*FT0/usr/bin/curl --no-keepalive --no-sessionid --noproxy -o /dev/null -s -w'time_namelookup=%{time_namelookup}51Testing软件测试网u [-b-Aa v;y!O
time_connect=%{time_connect}51Testing软件测试网OV9b4F~rX
time_appconnect=%{time_appconnect}51Testing软件测试网NF6J zTl jS&l_
time_pretransfer=%{time_pretransfer}51Testing软件测试网"`y/XPw I\+Y3y)n!A'JS
time_redirect=%{time_redirect}51Testing软件测试网$iHuhM
T C]
time_starttransfer=%{time_starttransfer}
+e#fQ SQ0size_download=%{size_download}51Testing软件测试网;r-@#rW]W+V X
size_upload=%{size_upload}51Testing软件测试网(`:[[*qvx
size_header=%{size_header}51Testing软件测试网)lt({#b.T&oT"a
size_request=%{size_request}
/in G*D-DKK0speed_download=%{speed_download}
3N8c4g)zX0speed_upload=%{speed_upload}
{Z(J2cr5G'o0content_type=%{content_type}
gx{h V0num_connects=%{num_connects}
/Svijra0num_redirects=%{num_redirects}51Testing软件测试网:^%mtm4Y!m1HT
redirect_url=%{redirect_url}
p:cO5eI0time_total=%{time_total}\n'http://www.baidu.com/img/baidu_sylogo1.gif -v --trace-time

获取结果如下：

"IS's,?d2qQ&QD1v%bg051Testing软件测试网 Eq C$kmCs

lRS+X1sMd004:15:55.518146 * About to connect() to www.baidu.com port 80 (#0)

04:15:55.518227 * Trying 220.181.112.143... connected

04:15:55.556297 * Connected to www.baidu.com (220.181.112.143) port 80 (#0)

04:15:55.556379 > GET /img/baidu_sylogo1.gif HTTP/1.151Testing软件测试网eAq0]:xY"Ac

04:15:55.556379 > User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.12.7.0 zlib/1.2.3 libidn/1.18 libssh2/1.2.251Testing软件测试网O.t$q)^8K z

04:15:55.556379 > Host: www.baidu.com

04:15:55.556379 > Accept: */*

[@|1u,mU#E5qd004:15:55.556379 >51Testing软件测试网cb;eDY-[a1vLZ

04:15:55.597388 < HTTP/1.1 200 OK

04:15:55.597427 < Date: Fri, 10 Feb 2012 04:59:24 GMT51Testing软件测试网-n un*~S

A~n'sZ J004:15:55.597459 < Server: Apache51Testing软件测试网a,WZ |Z

L,lP LP004:15:55.597490 < P3P: CP=" OTI DSP COR IVA OUR IND COM "

2a2Ml$I!x|Ea004:15:55.597521 < Set-Cookie: BAIDUID=HIGKOO6B478BD35F87D2A1F38AC765FE:FG=1; expires=Sat, 09-Feb-13 04:59:24 GMT; max-age=31536000; path=/; domain=.baidu.com; version=1

z g?u
k+U,Z004:15:55.597553 < Last-Modified: Thu, 20 Jan 2011 07:15:35 GMT

04:15:55.597584 < ETag: "66e-49a41e65988c2"

Z&pB&^J)k:p004:15:55.597615 < Accept-Ranges: bytes51Testing软件测试网R&Ra9|8C

f'C7H(o!Ov*_004:15:55.597646 < Content-Length: 163051Testing软件测试网],_r1Ab6A7c

04:15:55.597677 < Cache-Control: max-age=315360000

HZ@ i*Jg004:15:55.597707 < Expires: Mon, 07 Feb 2022 04:59:24 GMT51Testing软件测试网y+VKFa,\GD

$jE|%W9f!\)~O004:15:55.597739 < Connection: Keep-Alive

sY \$I6py['Y*~+L004:15:55.597771 < Content-Type: image/gif

5p;lug-q_N f004:15:55.597802 < data...

|
kbh#ek051Testing软件测试网3]T I:hD] Ie @q4j

-F8kEpN`0time_namelookup=0.011

HuY,g _ J,x0time_connect=0.049

time_appconnect=0.000

gZE k v+Z0time_pretransfer=0.049

o
w*N%y#n i/Y9RF9qw0time_redirect=0.000

FZ%w^j Q0time_starttransfer=0.09051Testing软件测试网)V
eFjC][

Xe8fE,k _!ci0size_download=1630

size_upload=0

n['e)A.Ek4}2G S:F0size_header=50551Testing软件测试网\/]1P^q'T0E8]X

4p&r1QFG0size_request=190

M FL0]:o{wa0speed_download=18030.000

speed_upload=0.00051Testing软件测试网#V1I0X9@ Usz4m

7y3~;u];V-_ M0content_type=image/gif

num_connects=1

$C,`?0DusY4["y0num_redirects=051Testing软件测试网
PQZ1Nh-{+G]/i]Y

zpe[#d.j:^ ?Y0redirect_url=51Testing软件测试网 amlKT

:be7c:xDw NJ0time_total=0.09051Testing软件测试网4xQK)a@#v4ruQ

lz-^|'O004:15:55.598190 * Closing connection #0