web_add_auto_header("x-requested-with", "XMLHttpRequest "); 在LR中的作用
以前懷疑過這個東西x-requested-with對於ajax請求在Loadrunner中起作用,但某些專案新增這個包頭後反而警告,與是就把沒有看它。
今天終於遇到一個網頁就是這個沒有新增導致的問題,慚愧!
JQuery and other libraries set the X-Requested-With header in the request to XMLHttpRequest
Some frameworks and coding will therefore rely on this header to detect whether a particular request is ajax-related (Zend Framework among them) and respond accordingly. Therefore an option to be able to specify this header be set in the flash request would
be very helpful:
X-Requested-With: XMLHttpRequest
Setting such a header would also mimic the behavior of jQuery ajax calls (which automatically set this header).
EDIT: Even better would be to allow the user to set _any_ header. But at the very least, the above header would be most helpful and make this more jQuery friendly.
在伺服器端判斷request來自Ajax請求(非同步)還是傳統請求(同步):
兩種請求在請求的Header不同,Ajax 非同步請求比傳統的同步請求多了一個頭引數
1、傳統同步請求引數
accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
accept-charset gb2312,utf-8;q=0.7,*;q=0.7
accept-encoding gzip,deflate
accept-language zh-cn,zh;q=0.5
cache-control max-age=0
connection keep-alive
cookie JSESSIONID=1A3BED3F593EA9747C9FDA16D309AF6B
host 192.168.101.72:8080
keep-alive 300
referer
user-agent Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15 (.NET CLR 3.5.30729)
2、Ajax 非同步請求方式
accept */*
accept-language zh-cn
referer
http://192.168.101.72:8080/scm/?token=3b194bff23bf6acecea5661ac8e14c51
x-requested-with XMLHttpRequest
content-type application/x-www-form-urlencoded,text/javascript
accept-encoding gzip, deflate
user-agent Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; QQDownload 598; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; CIBA; .NET CLR 1.1.4322; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; InfoPath.1)
host 192.168.101.72:8080
content-length 233
connection Keep-Alive
cache-control no-cache
cookie CSS=undefined; JSESSIONID=1B9AC25036290F7FB6823CCE1A24E541
可以看到 Ajax 請求多了個 x-requested-with ,可以利用它,request.getHeader("x-requested-with"); 為 null,則為傳統同步請求,為 XMLHttpRequest,則為 Ajax 非同步請求。
X-Requested-With標誌
當瀏覽器使用XMLHttpRequest物件提交請求時,會在請求頭新增X-Requested-With標誌,值為XMLHttpRequest。
所以可以通過檢查這個請求頭標誌來判斷請求提交的方式。
當瀏覽器使用XMLHttpRequest物件提交請求時,會在請求頭新增X-Requested-With標誌,值為XMLHttpRequest。
所以可以通過檢查這個請求頭標誌來判斷請求提交的方式。
PHP檢查:
if($_SERVER[ 'HTTP_X_REQUESTED_WITH' ] == 'XMLHttpRequest') { echo "AJAX"; } else { echo "NOT AJAX"; }
ASP.NET檢查:
if(Response.Header["HTTP_X_REQUESTED_WITH" ] == "XMLHttpRequest") {}