ajax请求(asynchronized)与普通请求(synchronized)的报文头(Header)不同:String reqType = request.getHeader("X-Requested-With");

if (null == reqType) {//normal request}

else if (reqType.equals("XMLHttpRequest")) {//ajax request}

1、request headersAccept:text/html,application/xhtml+xml,application/xml;q=0.9,p_w_picpath/webp,*/*;q=0.8

Accept-Encoding:gzip, deflate, sdch

Accept-Language:zh-CN,zh;q=0.8,en;q=0.6

Connection:keep-alive

Cookie:BD_HOME=0; BD_UPN=12314353; BAIDUID=6D80EC15FB3F7D55F6CF21531B4789A2:FG=1

Host:www.baidu.com

Referer:http://news.baidu.com/

Upgrade-Insecure-Requests:1

User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36

response headersBDPAGETYPE:1

BDQID:0xcc5e27ca0001088a

BDUSERID:0

Cache-Control:private

Connection:keep-alive

Content-Encoding:gzip

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

Cxy_all:baidu+1e0afc7905a9c9dcea7d6f252627f95b

Date:Fri, 06 May 2016 06:35:43 GMT

Expires:Fri, 06 May 2016 06:35:22 GMT

Server:bfe/1.0.8.14

Set-Cookie:PSTM=1462516543; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com

Set-Cookie:__bsi=17208040824016918998_00_2870_R_N_6_0303_C02F_N_I_I_0; expires=Fri, 06-May-16 06:35:48 GMT; domain=www.baidu.com; path=/

Set-Cookie:H_PS_PSSID=1442_19713_18281_19805_19899_19559_19807_19843_19902_19861_17001_15263_12288; path=/; domain=.baidu.com

Set-Cookie:BIDUPSID=6D80EC15FB3F7D55F6CF21531B4789A2; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com

Set-Cookie:BD_HOME=0; path=/

Set-Cookie:BDSVRTM=0; path=/

Transfer-Encoding:chunked

Vary:Accept-Encoding

X-Powered-By:HPHP

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

2、Ajax异步request headersAccept:text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01

Accept-Encoding:gzip, deflate, sdch

Accept-Language:zh-CN,zh;q=0.8,en;q=0.6

Connection:keep-alive

Cookie:BAIDUID=6D80EC15FB3F7D55F6CF21531B4789A2:FG=1; PSTM=1462516543; BD_HOME=0; H_PS_PSSID=1442_19713_18281_19805_19899_19559_19807_19843_19902_19861_17001_15263_12288; __bsi=17208040824016918998_00_2870_R_N_6_0303_C02F_N_I_I_0; BIDUPSID=5081A970DD87C74CFFBADF0B28A1AF39; BD_UPN=12314353

Host:www.baidu.com

Referer:https://www.baidu.com/

User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36

X-Requested-With:XMLHttpRequest

Ajax异步response headersCache-Control:private

Connection:keep-alive

Content-Length:95

Content-Type:baiduApp/json; v6.27.2.14; charset=UTF-8

Date:Fri, 06 May 2016 06:35:45 GMT

Expires:Fri, 06 May 2016 07:35:45 GMT

Server:bfe/1.0.8.14

Set-Cookie:__bsi=16943568347195085118_00_0_I_R_1_0303_C02F_N_I_I_0; expires=Fri, 06-May-16 06:35:50 GMT; domain=www.baidu.com; path=/