简例：访问baidu的头部

GET /?tn=98827400_hao_pg HTTP/1.1

Host: www.baidu.com

Connection: keep-alive

Cache-Control: max-age=0

Upgrade-Insecure-Requests: 1

User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

Accept-Encoding: gzip, deflate, sdch, br

Accept-Language: zh-CN,zh;q=0.8

Cookie: BAIDUID=6E944A2211CA31DEE11B9DB9F9D0F091:FG=1; PSTM=1538885969; BIDUPSID=9348D63AB314044C90E1B2BD0B630917; delPer=0; BD_CK_SAM=1; PSINO=6; H_PS_645EC=ae51TMRVE46wvoeM7DqNUGlJCMfcwQS78cVFMBa6aG8Nie6qjTlYIcfolGCccoIvxxcqpe88; BDUSS=hobEIwMzIyVWNZRWhmREdRNWNpU3EzTWVJOW9vMnMxWFVCYWV6dk9Oa1QtajljQVFBQUFBJCQAAAAAAAAAAAEAAAAC3iAUZmF0MzkAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABNtGFwTbRhcN1; BDORZ=FFFB88E999055A3F8A630C64834BD6D0; BDRCVFR[uZj3G_6bTl0]=mk3SLVN4HKm; BD_HOME=1; H_PS_PSSID=; PRY=1; BD_UPN=12314753

Request_Headers

HTTP/1.1 200 OK

Bdpagetype: 2

Bdqid: 0x930507d70001e3e0

Cache-Control: private

Connection: Keep-Alive

Content-Type: text/html;charset=utf-8

Date: Tue, 18 Dec 2018 04:01:12 GMT

Expires: Tue, 18 Dec 2018 04:01:12 GMT

P3p: CP=" OTI DSP COR IVA OUR IND COM "

Server: BWS/1.1

Set-Cookie: BDRCVFR[uZj3G_6bTl0]=mk3SLVN4HKm; path=/; domain=.baidu.com

Set-Cookie: BDSVRTM=181; path=/

Set-Cookie: BD_HOME=1; path=/

Set-Cookie: H_PS_PSSID=; path=/; domain=.baidu.com

Strict-Transport-Security: max-age=172800

X-Ua-Compatible: IE=Edge,chrome=1

Transfer-Encoding: chunked

Response Headers

HTML头部常量

User-Agent

"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1",

"Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",

"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.6 (KHTML, like Gecko) Chrome/20.0.1092.0 Safari/536.6",

"Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.6 (KHTML, like Gecko) Chrome/20.0.1090.0 Safari/536.6",

"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.1",

"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.9 Safari/536.5",

"Mozilla/5.0 (Windows NT 6.0) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.36 Safari/536.5",

"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",

"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",

"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_0) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",

"Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",

"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",

"Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",

"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",

"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",

"Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.0 Safari/536.3",

"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.24 (KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24",

"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/535.24 (KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24",

Content-Type

常使用的几种

种类 文件扩展名 Content-Type(Mime-Type)
2003 Excel .xls application/vnd.ms-excel
2010 Excel .xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
文本文件 .txt text/plain
图片 .png/.jpg/.gif image/*
页面 .htm/.html text/html
视频 .avi/ .mpg/ .mpeg/ .mp4 video/*
音频 .mp3/ .wav/ audio/*
PDF .pdf application/pdf 
# Office

文件扩展名	Content-Type(Mime-Type)

.doc	application/msword

.dot	application/msword

.docx	application/vnd.openxmlformats-officedocument.wordprocessingml.document

.dotx	application/vnd.openxmlformats-officedocument.wordprocessingml.template

.docm	application/vnd.ms-word.document.macroEnabled.12

.dotm	application/vnd.ms-word.template.macroEnabled.12

.xls	application/vnd.ms-excel

.xlt	application/vnd.ms-excel

.xla	application/vnd.ms-excel

.xlsx	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

.xltx	application/vnd.openxmlformats-officedocument.spreadsheetml.template

.xlsm	application/vnd.ms-excel.sheet.macroEnabled.12

.xltm	application/vnd.ms-excel.template.macroEnabled.12

.xlam	application/vnd.ms-excel.addin.macroEnabled.12

.xlsb	application/vnd.ms-excel.sheet.binary.macroEnabled.12

.ppt	application/vnd.ms-powerpoint

.pot	application/vnd.ms-powerpoint

.pps	application/vnd.ms-powerpoint

.ppa	application/vnd.ms-powerpoint

.pptx	application/vnd.openxmlformats-officedocument.presentationml.presentation

.potx	application/vnd.openxmlformats-officedocument.presentationml.template

.ppsx	application/vnd.openxmlformats-officedocument.presentationml.slideshow

.ppam	application/vnd.ms-powerpoint.addin.macroEnabled.12

.pptm	application/vnd.ms-powerpoint.presentation.macroEnabled.12

.potm	application/vnd.ms-powerpoint.presentation.macroEnabled.12

.ppsm	application/vnd.ms-powerpoint.slideshow.macroEnabled.12

# 常用对照表

文件扩展名	Content-Type(Mime-Type)

.*（ 二进制流，不知道下载文件类型）	application/octet-stream

.tif	image/tiff

.001	application/x-001

.301	application/x-301

.323	text/h323

.906	application/x-906

.907	drawing/907

.a11	application/x-a11

.acp	audio/x-mei-aac

.ai	application/postscript

.aif	audio/aiff

.aifc	audio/aiff

.aiff	audio/aiff

.anv	application/x-anv

.asa	text/asa

.asf	video/x-ms-asf

.asp	text/asp

.asx	video/x-ms-asf

.au	audio/basic

.avi	video/avi

.awf	application/vnd.adobe.workflow

.biz	text/xml

.bmp	application/x-bmp

.bot	application/x-bot

.c4t	application/x-c4t

.c90	application/x-c90

.cal	application/x-cals

.cat	application/vnd.ms-pki.seccat

.cdf	application/x-netcdf

.cdr	application/x-cdr

.cel	application/x-cel

.cer	application/x-x509-ca-cert

.cg4	application/x-g4

.cgm	application/x-cgm

.cit	application/x-cit

.class	java/*

.cml	text/xml

.cmp	application/x-cmp

.cmx	application/x-cmx

.cot	application/x-cot

.crl	application/pkix-crl

.crt	application/x-x509-ca-cert

.csi	application/x-csi

.css	text/css

.cut	application/x-cut

.dbf	application/x-dbf

.dbm	application/x-dbm

.dbx	application/x-dbx

.dcd	text/xml

.dcx	application/x-dcx

.der	application/x-x509-ca-cert

.dgn	application/x-dgn

.dib	application/x-dib

.dll	application/x-msdownload

.doc	application/msword

.dot	application/msword

.drw	application/x-drw

.dtd	text/xml

.dwf	Model/vnd.dwf

.dwf	application/x-dwf

.dwg	application/x-dwg

.dxb	application/x-dxb

.dxf	application/x-dxf

.edn	application/vnd.adobe.edn

.emf	application/x-emf

.eml	message/rfc822

.ent	text/xml

.epi	application/x-epi

.eps	application/x-ps

.eps	application/postscript

.etd	application/x-ebx

.exe	application/x-msdownload

.fax	image/fax

.fdf	application/vnd.fdf

.fif	application/fractals

.fo	text/xml

.frm	application/x-frm

.g4	application/x-g4

.gbr	application/x-gbr

.	application/x-

.gif	image/gif

.gl2	application/x-gl2

.gp4	application/x-gp4

.hgl	application/x-hgl

.hmr	application/x-hmr

.hpg	application/x-hpgl

.hpl	application/x-hpl

.hqx	application/mac-binhex40

.hrf	application/x-hrf

.hta	application/hta

.htc	text/x-component

.htm	text/html

.html	text/html

.htt	text/webviewhtml

.htx	text/html

.icb	application/x-icb

.ico	image/x-icon

.ico	application/x-ico

.iff	application/x-iff

.ig4	application/x-g4

.igs	application/x-igs

.iii	application/x-iphone

.img	application/x-img

.ins	application/x-internet-signup

.isp	application/x-internet-signup

.IVF	video/x-ivf

.java	java/*

.jfif	image/jpeg

.jpe	image/jpeg

.jpe	application/x-jpe

.jpeg	image/jpeg

.jpg	image/jpeg

.jpg	application/x-jpg

.js	application/x-javascript

.jsp	text/html

.la1	audio/x-liquid-file

.lar	application/x-laplayer-reg

.latex	application/x-latex

.lavs	audio/x-liquid-secure

.lbm	application/x-lbm

.lmsff	audio/x-la-lms

.ls	application/x-javascript

.ltr	application/x-ltr

.m1v	video/x-mpeg

.m2v	video/x-mpeg

.m3u	audio/mpegurl

.m4e	video/mpeg4

.mac	application/x-mac

.man	application/x-troff-man

.math	text/xml

.mdb	application/msaccess

.mdb	application/x-mdb

.mfp	application/x-shockwave-flash

.mht	message/rfc822

.mhtml	message/rfc822

.mi	application/x-mi

.mid	audio/mid

.midi	audio/mid

.mil	application/x-mil

.mml	text/xml

.mnd	audio/x-musicnet-download

.mns	audio/x-musicnet-stream

.mocha	application/x-javascript

.movie	video/x-sgi-movie

.mp1	audio/mp1

.mp2	audio/mp2

.mp2v	video/mpeg

.mp3	audio/mp3

.mp4	video/mpeg4

.mpa	video/x-mpg

.mpd	application/vnd.ms-project

.mpe	video/x-mpeg

.mpeg	video/mpg

.mpg	video/mpg

.mpga	audio/rn-mpeg

.mpp	application/vnd.ms-project

.mps	video/x-mpeg

.mpt	application/vnd.ms-project

.mpv	video/mpg

.mpv2	video/mpeg

.mpw	application/vnd.ms-project

.mpx	application/vnd.ms-project

.mtx	text/xml

.mxp	application/x-mmxp

.net	image/pnetvue

.nrf	application/x-nrf

.nws	message/rfc822

.odc	text/x-ms-odc

.out	application/x-out

.p10	application/pkcs10

.p12	application/x-pkcs12

.p7b	application/x-pkcs7-certificates

.p7c	application/pkcs7-mime

.p7m	application/pkcs7-mime

.p7r	application/x-pkcs7-certreqresp

.p7s	application/pkcs7-signature

.pc5	application/x-pc5

.pci	application/x-pci

.pcl	application/x-pcl

.pcx	application/x-pcx

.pdf	application/pdf

.pdf	application/pdf

.pdx	application/vnd.adobe.pdx

.pfx	application/x-pkcs12

.pgl	application/x-pgl

.pic	application/x-pic

.pko	application/vnd.ms-pki.pko

.pl	application/x-perl

.plg	text/html

.pls	audio/scpls

.plt	application/x-plt

.png	image/png

.png	application/x-png

.pot	application/vnd.ms-powerpoint

.ppa	application/vnd.ms-powerpoint

.ppm	application/x-ppm

.pps	application/vnd.ms-powerpoint

.ppt	application/vnd.ms-powerpoint

.ppt	application/x-ppt

.pr	application/x-pr

.prf	application/pics-rules

.prn	application/x-prn

.prt	application/x-prt

.ps	application/x-ps

.ps	application/postscript

.ptn	application/x-ptn

.pwz	application/vnd.ms-powerpoint

.r3t	text/vnd.rn-realtext3d

.ra	audio/vnd.rn-realaudio

.ram	audio/x-pn-realaudio

.ras	application/x-ras

.rat	application/rat-file

.rdf	text/xml

.rec	application/vnd.rn-recording

.red	application/x-red

.rgb	application/x-rgb

.rjs	application/vnd.rn-realsystem-rjs

.rjt	application/vnd.rn-realsystem-rjt

.rlc	application/x-rlc

.rle	application/x-rle

.rm	application/vnd.rn-realmedia

.rmf	application/vnd.adobe.rmf

.rmi	audio/mid

.rmj	application/vnd.rn-realsystem-rmj

.rmm	audio/x-pn-realaudio

.rmp	application/vnd.rn-rn_music_package

.rms	application/vnd.rn-realmedia-secure

.rmvb	application/vnd.rn-realmedia-vbr

.rmx	application/vnd.rn-realsystem-rmx

.rnx	application/vnd.rn-realplayer

.rp	image/vnd.rn-realpix

.rpm	audio/x-pn-realaudio-plugin

.rsml	application/vnd.rn-rsml

.rt	text/vnd.rn-realtext

.rtf	application/msword

.rtf	application/x-rtf

.rv	video/vnd.rn-realvideo

.sam	application/x-sam

.sat	application/x-sat

.sdp	application/sdp

.sdw	application/x-sdw

.sit	application/x-stuffit

.slb	application/x-slb

.sld	application/x-sld

.slk	drawing/x-slk

.smi	application/smil

.smil	application/smil

.smk	application/x-smk

.snd	audio/basic

.sol	text/plain

.sor	text/plain

.spc	application/x-pkcs7-certificates

.spl	application/futuresplash

.spp	text/xml

.ssm	application/streamingmedia

.sst	application/vnd.ms-pki.certstore

.stl	application/vnd.ms-pki.stl

.stm	text/html

.sty	application/x-sty

.svg	text/xml

.swf	application/x-shockwave-flash

.tdf	application/x-tdf

.tg4	application/x-tg4

.tga	application/x-tga

.tif	image/tiff

.tif	application/x-tif

.tiff	image/tiff

.tld	text/xml

.top	drawing/x-top

.torrent	application/x-bittorrent

.tsd	text/xml

.txt	text/plain

.uin	application/x-icq

.uls	text/iuls

.vcf	text/x-vcard

.vda	application/x-vda

.vdx	application/vnd.visio

.vml	text/xml

.vpg	application/x-vpeg005

.vsd	application/vnd.visio

.vsd	application/x-vsd

.vss	application/vnd.visio

.vst	application/vnd.visio

.vst	application/x-vst

.vsw	application/vnd.visio

.vsx	application/vnd.visio

.vtx	application/vnd.visio

.vxml	text/xml

.wav	audio/wav

.wax	audio/x-ms-wax

.wb1	application/x-wb1

.wb2	application/x-wb2

.wb3	application/x-wb3

.wbmp	image/vnd.wap.wbmp

.wiz	application/msword

.wk3	application/x-wk3

.wk4	application/x-wk4

.wkq	application/x-wkq

.wks	application/x-wks

.wm	video/x-ms-wm

.wma	audio/x-ms-wma

.wmd	application/x-ms-wmd

.wmf	application/x-wmf

.wml	text/vnd.wap.wml

.wmv	video/x-ms-wmv

.wmx	video/x-ms-wmx

.wmz	application/x-ms-wmz

.wp6	application/x-wp6

.wpd	application/x-wpd

.wpg	application/x-wpg

.wpl	application/vnd.ms-wpl

.wq1	application/x-wq1

.wr1	application/x-wr1

.wri	application/x-wri

.wrk	application/x-wrk

.ws	application/x-ws

.ws2	application/x-ws

.wsc	text/scriptlet

.wsdl	text/xml

.wvx	video/x-ms-wvx

.xdp	application/vnd.adobe.xdp

.xdr	text/xml

.xfd	application/vnd.adobe.xfd

.xfdf	application/vnd.adobe.xfdf

.xhtml	text/html

.xls	application/vnd.ms-excel

.xls	application/x-xls

.xlw	application/x-xlw

.xml	text/xml

.xpl	audio/scpls

.xq	text/xml

.xql	text/xml

.xquery	text/xml

.xsd	text/xml

.xsl	text/xml

.xslt	text/xml

.xwd	application/x-xwd

.x_b	application/x-x_b

.sis	application/vnd.symbian.install

.sisx	application/vnd.symbian.install

.x_t	application/x-x_t

.ipa	application/vnd.iphone

.apk	application/vnd.android.package-archive

.xap	application/x-silverlight-app

mime

('.html', 'text/html'),

('.htm', 'text/html'),

('.js', 'application/javascript'),

('.css', 'text/css'),

('.json', 'application/json'),

('.png', 'image/png'),

('.jpg', 'image/jpeg'),

('.gif', 'image/gif'),

('.txt', 'text/plain'),

('.avi', 'video/x-msvideo'),

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