im trying to call a page on "Server B" from "Server A" using http_request method. the problem is the request fails at http_request.open(). Below is the very basic code im using that can be found everywhere online.

Code Calling from a page on Server (site) A. Requesting URL is on Server (site) B

makeRequest('http://www.sitename.com/ajax_insert.php?field_name=test&field_value=',this.value);

This is the code in the makeRequest() function which is on Server (site) A.

function makeRequest(url, parameters) {

    http_request = false;
    if (window.ActiveXObject) { // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    } else if (window.XMLHttpRequest) {// Mozilla, Safari,...xmlHttpReq.overrideMimeType
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            // set type accordingly to anticipated content type
            http_request.overrideMimeType('text/xml');
        }else{ alert('Did not create *http_request.overrideMimeType*'); return false; }
    } 

    if (!http_request) {

        alert('Cannot create XMLHTTP instance');
        return false;

    }

    http_request.onreadystatechange = alertContents;

    // FOR GET VARS
    http_request.open('GET', url + parameters, true);
    http_request.send(null);
    
}

So what am i missing? How can i get the http_request to process a page on another server (site). FYI, outside this application, my code as written works fine.

Thank you much for all the help.
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Ajax (xmlHttpRequests) can only be made inside 1 domain (I don't know about ip's though). You cannot reach another domain.
It's a security restriction that is applied by all browsers.
You either need to setup a proxy server side, or to rely on non-ajax requests.

hey thierry its cesar. hows it going. man this is not the great news im looking for!
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there has to be a JS solution. i would just cURL the info but i server A is not in my control. People are placing my code on their sites and accessing a page on my server... ahh. need this to work.

Some work has been done offline, but if anyone want reference, EmpireSolution went the proxy route, looking for those links:

http://blog.michaelkidd.com/2007/10/php-ajax-proxy.html
http://sourceforge.net/projects/jpspan/
http://developer.yahoo.com/javascrip...oxy_simple.txt

thanks for the help tripy. unfortunately these methods rely on cURL, which would be great but i cannot assume all sites using my code will have cURL working.