IE is throwing inconsistent responses with the Ajax (XDR) requests

Question

IE is throwing inconsistent responses with the Ajax (XDR) requests

While working on an IE plugin that injects an iframe onto every page, I encountered a problem with making ajax requests. To resolve this, I resorted to using IE's cross domain request instead of jQuery's ajax method, which tends to fail in IE. Surprisingly, this solution worked successfully about 75% of the time on IE8 & 9. However, in the remaining 25% of cases, the xdr.onload event wouldn't even trigger.

The PHP server seemed to be functioning correctly based on the logs, as there was no noticeable difference in the log entries between instances where onload fired and those where it didn't. Additionally, xdr.onerror did not fire either.

If anyone has any insights or ideas on how to address this issue, I would greatly appreciate the help.

        thisURL = "http://example.com/getmsg.php?cmd=getMessage&iid=ddeb2c1228&uurl=http%3A%2F%2Fwww.cnn.com%2F&t=" + Math.random(); 

        // Using Microsoft XDR
        var xdr = new XDomainRequest();
        xdr.open("GET", thisURL);
        xdr.onload = function() {
            // This alert is only sometimes triggered in IE
            alert('INCONSISTENT ALERT');
            callback(xdr.responseText);
        };
        xdr.send();

javascript ajax internet-explorer cross-domain xdr

Answer 1

Answer №1

Encountering a similar issue, I found my XDomainRequests failing intermittently even though the headers were being sent correctly according to Fiddler. Despite defining all event handlers and timeout properties on the XDR objects, none of the handlers were triggered. Strangely, the F12 developer tools indicated that the requests were aborted. Both GET and POST requests could be aborted across various domains, except for the first request which always succeeded.

As a solution, I decided to place the xdr.send calls inside a timeout function:

setTimeout(function () {
    xdr.send();
}, 0);

Surprisingly, this workaround resolved the issue. While I cannot explain why it worked, perhaps this approach may prove useful to others facing a similar problem.

Answer 2

Encountering a similar issue, I found my XDomainRequests failing intermittently even though the headers were being sent correctly according to Fiddler. Despite defining all event handlers and timeout properties on the XDR objects, none of the handlers were triggered. Strangely, the F12 developer tools indicated that the requests were aborted. Both GET and POST requests could be aborted across various domains, except for the first request which always succeeded.

As a solution, I decided to place the xdr.send calls inside a timeout function:

setTimeout(function () {
    xdr.send();
}, 0);

Surprisingly, this workaround resolved the issue. While I cannot explain why it worked, perhaps this approach may prove useful to others facing a similar problem.

Answer 3

Answer №2

Identifying the title is correct in this instance, but the experience can be described as inconsistent. Let's delve into it...

var xdr, err, res, foo, url;

xdr = new XDomainRequest();

err = function(){ alert("An error occurred, operation terminated"); }
res = function(){ alert("Success! " + xdr.responseText); }
foo = function(){ return; }

url = "http://hello.com/here/is/the/url/?query=true&whatever=asd";

xdr.onerror = err;
xdr.ontimeout = foo;
xdr.onprogress = foo;
xdr.onload = res;
xdr.timeout = 5000;

xdr.open("get", url);
xdr.send(null);

The behavior of the XDomainRequest object varies in different versions of Internet Explorer.

In IE9 -> the XDomainRequest object necessitates that all handlers are assigned a method. If a method is not defined for handles like onerror, onload, ontimeout, and onprogress then the network response will be "operation aborted".

In IE7/8/9 -> the XDomainRequest is set to ASYNC by default. It will continue executing code lower down the stack regardless of whether the xdr object has completed or not. Using a setTimeout may seem like a workaround, but it is not recommended.

In such scenarios, triggering an event and waiting for the event before proceeding with any further code could be beneficial. An example using jQuery:

// invoke this method during xdr onload
$(document).trigger("xdr_complete");

// use this wrapper for code to be executed after xdr completion
$(document).bind("xdr_complete", function(){ ... });

In IE7/IE8, you'll observe that it functions differently. These versions are more lenient and do not terminate execution if there are missing methods for the handlers.

Answer 4

Identifying the title is correct in this instance, but the experience can be described as inconsistent. Let's delve into it...

var xdr, err, res, foo, url;

xdr = new XDomainRequest();

err = function(){ alert("An error occurred, operation terminated"); }
res = function(){ alert("Success! " + xdr.responseText); }
foo = function(){ return; }

url = "http://hello.com/here/is/the/url/?query=true&whatever=asd";

xdr.onerror = err;
xdr.ontimeout = foo;
xdr.onprogress = foo;
xdr.onload = res;
xdr.timeout = 5000;

xdr.open("get", url);
xdr.send(null);

The behavior of the XDomainRequest object varies in different versions of Internet Explorer.

In IE9 -> the XDomainRequest object necessitates that all handlers are assigned a method. If a method is not defined for handles like onerror, onload, ontimeout, and onprogress then the network response will be "operation aborted".

In IE7/8/9 -> the XDomainRequest is set to ASYNC by default. It will continue executing code lower down the stack regardless of whether the xdr object has completed or not. Using a setTimeout may seem like a workaround, but it is not recommended.

In such scenarios, triggering an event and waiting for the event before proceeding with any further code could be beneficial. An example using jQuery:

// invoke this method during xdr onload
$(document).trigger("xdr_complete");

// use this wrapper for code to be executed after xdr completion
$(document).bind("xdr_complete", function(){ ... });

In IE7/IE8, you'll observe that it functions differently. These versions are more lenient and do not terminate execution if there are missing methods for the handlers.

Answer 5

Answer №3

Discovered the issue at the last minute. It turned out that I needed to specify a timeout value, even though the requests were not experiencing timeouts. To effectively debug an XDR problem, you can use the following code snippet. Each alert in the code provides insight into what's happening with your code. In my case, the missing timeout declaration was the culprit. However, the code below should help troubleshoot any XDR issues:

       var xdr = new XDomainRequest();
            if (xdr) {
                xdr.onerror = function () {
//                    alert('xdr onerror');
                };
                xdr.ontimeout = function () {
//                    alert('xdr ontimeout');
                };
                xdr.onprogress = function () {
//                    alert("XDR onprogress");
//                    alert("Got: " + xdr.responseText);
                };
                xdr.onload = function() {
//                    alert('onload' + xdr.responseText);
                    callback(xdr.responseText);
                };
                xdr.timeout = 5000;
                xdr.open("get", thisURL);
                xdr.send();
            } else {
//                alert('failed to create xdr');
            }

Answer 6

Discovered the issue at the last minute. It turned out that I needed to specify a timeout value, even though the requests were not experiencing timeouts. To effectively debug an XDR problem, you can use the following code snippet. Each alert in the code provides insight into what's happening with your code. In my case, the missing timeout declaration was the culprit. However, the code below should help troubleshoot any XDR issues:

       var xdr = new XDomainRequest();
            if (xdr) {
                xdr.onerror = function () {
//                    alert('xdr onerror');
                };
                xdr.ontimeout = function () {
//                    alert('xdr ontimeout');
                };
                xdr.onprogress = function () {
//                    alert("XDR onprogress");
//                    alert("Got: " + xdr.responseText);
                };
                xdr.onload = function() {
//                    alert('onload' + xdr.responseText);
                    callback(xdr.responseText);
                };
                xdr.timeout = 5000;
                xdr.open("get", thisURL);
                xdr.send();
            } else {
//                alert('failed to create xdr');
            }

Answer 7

Answer №4

Providing a definitive answer in this situation is challenging.

To start, it would be beneficial to use Fiddler to check for any network failures that may be occurring. This will help determine if the request has been sent and what response is being received from the server.

Additionally, there was a recent issue with cross-domain functionality in Internet Explorer that didn't occur in other browsers like Firefox, Safari, and Chrome. In this case, IE halted all execution upon receiving a 404 error response, whereas other browsers allowed the script to continue running. If you are encountering a similar problem, consider modifying your error handling to ensure the script can proceed even when errors occur.

Answer 8

Providing a definitive answer in this situation is challenging.

To start, it would be beneficial to use Fiddler to check for any network failures that may be occurring. This will help determine if the request has been sent and what response is being received from the server.

Additionally, there was a recent issue with cross-domain functionality in Internet Explorer that didn't occur in other browsers like Firefox, Safari, and Chrome. In this case, IE halted all execution upon receiving a 404 error response, whereas other browsers allowed the script to continue running. If you are encountering a similar problem, consider modifying your error handling to ensure the script can proceed even when errors occur.

Answer 9

Answer №5

To start, make sure to include an onerror handler for debugging purposes. Take note of any errors that are logged to identify the issue.
Instead of relying on 'math.random', consider using new Date().getTime() for generating unique requests each time.
Consider utilizing POST methods to work around Internet Explorer's peculiar behavior related to standards compliance.

Answer 10

To start, make sure to include an onerror handler for debugging purposes. Take note of any errors that are logged to identify the issue.
Instead of relying on 'math.random', consider using new Date().getTime() for generating unique requests each time.
Consider utilizing POST methods to work around Internet Explorer's peculiar behavior related to standards compliance.

IE is throwing inconsistent responses with the Ajax (XDR) requests

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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