"]J n S%fr6v8G[,zP0   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c[5fs{.Y51Testing软件测试网d5C,]bKj7E

51Testing软件测试网M)z;a.DU

Linux的命令行怎样实现类似功能呢？curl即可实现：51Testing软件测试网,Zb:[9`MT0N

w*G^"HvC2H:a0/usr/bin/curl --no-keepalive --no-sessionid --noproxy -o /dev/null -s

-w'time_namelookup=%{time_namelookup}51Testing软件测试网y+I1}(eO#Vh9y!S

time_connect=%{time_connect}51Testing软件测试网 J3s)h` ud

time_appconnect=%{time_appconnect}

e"F$~5FMR~6xa

\(~0time_pretransfer=%{time_pretransfer}

I

p"qB z|~0time_redirect=%{time_redirect}51Testing软件测试网)@3A&w7^3|3B,_ p7_?

time_starttransfer=%{time_starttransfer}

2qQm(zD0size_download=%{size_download}

(\-y)|mw5ZGx Y0size_upload=%{size_upload}51Testing软件测试网pLQAT9Q

size_header=%{size_header}

G&q9e

KCb\#v I1?0size_request=%{size_request}51Testing软件测试网|-O#_e"xg0aX\$U

speed_download=%{speed_download}51Testing软件测试网'PIb&oel`KS

speed_upload=%{speed_upload}

M[W;oH0content_type=%{content_type}51Testing软件测试网O/wo*Rkt&z

num_connects=%{num_connects}51Testing软件测试网l\[@8n

dxi-v

num_redirects=%{num_redirects}

HLx{X|0redirect_url=%{redirect_url}51Testing软件测试网L1A+z6a [,E+f

time_total=%{time_total}\n'http://www.baidu.com/img/baidu_sylogo1.gif

-v --trace-time51Testing软件测试网9q5gKX

Z0u0h51Testing软件测试网T/fNrW6an$M

获取结果如下：51Testing软件测试网,}~Y%a7_hG51Testing软件测试网-o

{8TS~7Hp7T1L

51Testing软件测试网iP%R&uTW51Testing软件测试网5]xh6ZYI

g7E

04:15:55.518146 * About to connect() to www.baidu.com port 80 (#0),zdWBn6~uc0

7f"pEA6Yf004:15:55.518227 * Trying 220.181.112.143... connected51Testing软件测试网:]vX^

k[#bzd#Q51Testing软件测试网Gq6h6wS_ok

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

(#0)51Testing软件测试网M:Y3D4l4Cb,X51Testing软件测试网,FD k{4xY5O

04:15:55.556379 > GET /img/baidu_sylogo1.gif HTTP/1.151Testing软件测试网0A.md0H4Cf

)r7_O u(]K3UW@!q004:15:55.556379 > 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(Boot9O

Tp$e]O M?t)g004:15:55.556379 > Host: www.baidu.com51Testing软件测试网%\8}rU"[0`7N4l

+Q4O

Nh4l!kn$V-B}#vy004:15:55.556379 > Accept: */*51Testing软件测试网p3~OMn-H

"K:?OW0E0Y004:15:55.556379 >)Y.G7|g!~F$SW^0

$T&P^Z)FNT004:15:55.597388 < HTTP/1.1 200 OKRr{"b+EB+d'Ap051Testing软件测试网5J:Qm4y#Yg

04:15:55.597427 < Date: Fri, 10 Feb 2012 04:59:24 GMT)z,a|!LX+t Jt%I051Testing软件测试网+[S:c_JP0g-cW

04:15:55.597459 < Server: Apache51Testing软件测试网

|M-~p:z6i51Testing软件测试网#JL)n(b3O_i`M1e

04:15:55.597490 < P3P: CP=" OTI DSP COR IVA OUR IND COM "51Testing软件测试网N:yZ7`z|

NI/Q'A*W004:15:55.597521 < Set-Cookie:

BAIDUID=HIGKOO6B478BD35F87D2A1F38AC765FE:FG=1; expires=Sat, 09-Feb-13 04:59:24

GMT; max-age=31536000; path=/; domain=.baidu.com; version=151Testing软件测试网T0}_;~!C`n^

IY2bM5jh-VK/K004:15:55.597553 < Last-Modified: Thu, 20 Jan 2011 07:15:35 GMT51Testing软件测试网+y0G0yg!]:].m51Testing软件测试网)E@u)Gi(~@c@

04:15:55.597584 < ETag: "66e-49a41e65988c2"51Testing软件测试网d9B)U&}8M

o*jc0@%L^004:15:55.597615 < Accept-Ranges: bytes51Testing软件测试网9B%T!ze

o5x!hbb51Testing软件测试网9D2~-\p/r

04:15:55.597646 < Content-Length: 1630V8\G+Y;m_l`8rv&}0

Dw }{ SY004:15:55.597677 < Cache-Control: max-age=31536000051Testing软件测试网4{#pD&Q$Y@`'@51Testing软件测试网3Oj:KHF-}:n5{

04:15:55.597707 < Expires: Mon, 07 Feb 2022 04:59:24 GMT51Testing软件测试网p/\~|2BI)nt51Testing软件测试网0E E.|i%]]&cm

04:15:55.597739 < Connection: Keep-AliveThYQ%}:q*L+tR0

H&G4C5k1I004:15:55.597771 < Content-Type: image/gifo]k lHE:}051Testing软件测试网bn?*Y%K)X_,iNi

04:15:55.597802 < data...-p^u5y-|5s[,{-w051Testing软件测试网-V0X_]y5z#@p

51Testing软件测试网Fg-^-C^2E]

T4Z-I51Testing软件测试网;_'t(zr/~&R0r5r

time_namelookup=0.01151Testing软件测试网{*`9`\NzIp51Testing软件测试网8|`f6E

^ M7jO

time_connect=0.049;u8x+kA#T-I3gT0

e1uAAt0time_appconnect=0.00051Testing软件测试网,S-@8?0|;V-uFE*T

n.z:\g3jq.qd0time_pretransfer=0.04951Testing软件测试网Jk

z_X}51Testing软件测试网Z;J_I9M%g"xW.M?

time_redirect=0.00051Testing软件测试网&E

QC8]#Tb(M51Testing软件测试网~0p0MXPE

time_starttransfer=0.09051Testing软件测试网9mgX:eid3b51Testing软件测试网$Y!pm9F\J3Mo

size_download=1630(p&w.h!_hKf W051Testing软件测试网}1X?Mo'u

size_upload=051Testing软件测试网6L%k#``lXlz51Testing软件测试网Ii8jL1Mo+_

size_header=505Zr0\!n(a&e;?Q051Testing软件测试网vS+uv(Z D3|0P

size_request=19051Testing软件测试网F1@AFlF51Testing软件测试网E~9D7E

R MxgKC

speed_download=18030.00051Testing软件测试网9G2|&S-Y:ae

or]qY%a)J$Ge0speed_upload=0.000Xi6XE3F&[[Y8h0m051Testing软件测试网@7Jy a~\u

content_type=image/gif51Testing软件测试网g:A3W3kevj{y

by6gIGTW W0num_connects=151Testing软件测试网"^of

P#Q'fA,r;i)n

8g0W1_QCU0num_redirects=051Testing软件测试网*dz0Neos0Rz}-r

q!V@5]!Q0redirect_url=51Testing软件测试网X+{'Bz4?8q

}E"KUJ&R'G-P0time_total=0.090tG}@Q8s5t4CY0

)o`0j~R~;A2f004:15:55.598190 * Closing connection #051Testing软件测试网o5Z'^G!ATS2K:I