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AJAX and boa issue

Hi all,
recently i am studying on AJAX. According my understanding, AJAX focus on client side by javascript,css then it supposed to work with whatever language on server side. therefore, i intend to integrate AJAX with cgi program on a boa server. however, when the object of XMLHttpRequest() sends data to server, a error message "400 Bad Request" is given and "Unknow Content-Length Post" error message on server side.
anyone encountered this problem before?is this problem caused by my misunderstand or boa server?

thanks for any advices!

I tried to send data back to server in another way:

Code:

 var query="/cgi-bin/ajaxtest";

 query=query+"?message="+str;

 xmlHttp.open("get",query,true);

 xmlHttp.send(null);

the cgi program can receive data from CONTENT_LENGTH environment variable but the last character is missed. so far, this is the only way i tried that the cgi program can receive data from javascript.any idea?