Problem on Illegel Request

[zhang...@gmail.com]

Dear all, I am scrappying this website: http://www.ipe.org.cn/MapPollution/Pollution.aspx?q=3&type=1 to get the data in the left table. 

As the website is dynamic, I am using chrome and as usual F12 key suggest me that the url for the data table is as follows:

http://www.ipe.org.cn/data_ashx/GetAirData.ashx?headers%5BCookie%5D=__utma%3D105455707.2085750457.1484059136.1484059136.1484059136.1%3B+__utmb%3D105455707.11.10.1484059136%3B+__utmc%3D105455707%3B+__utmz%3D105455707.1484059136.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B+ajaxkey%3DDBE2AA746099DFD180C3CC886ADE0AB74E8391F1502494EF&cmd=getpollution_fenye&pageindex=1&pagesize=8&province=0&city=0&key=&pollution=0&enterprisids=0%2F1%2F2%2F3&standardids=0%2F1%2F2%2F3&feedbacks=0%2F1%2F2&type=1

but when I use this url to get to the table, I get illegel request. Why?

Thank you very much!