Firefox returns a "null" error when attempting to access the Vimeo API, whereas there are no errors reported when accessing the YouTube API or when

I tried researching this issue on multiple platforms, including Google and other forums, but I am still unable to resolve it. I recently transitioned from a proxy request approach (using AJAX to communicate with a server-side script that then interacts with an external server) to a fully browser-based method for retrieving video data from the Youtube and Vimeo APIs. Although everything functions smoothly with Youtube, I encountered an exception in Firefox when working with Vimeo (although it works fine in Konqueror using Webkit). The version of Firefox I am using is 17.0.1. Here is the relevant excerpt of the code:

function getAsync(url2)
    {
    console.log('async url: ' + url2);
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        }

    if (req != undefined) {
        req.onreadystatechange = function() {console.log("statechanged ");};            
        console.log('3a');
        try {
           console.log(" try... ");
           req.open("GET", url2, false); // 3rd param is whether "async"
        } catch (err) {
           console.log('err name=['+err.name + ']: err.message=[' + err.message + '] (line ' + err.lineNumber + ')');
        }
        console.log('3b');
        try {
           console.log(' about to send... ');
           req.send("");
        } catch (err) {
           console.log('err name=['+err.name + ']: err.message=[' + err.message + '] (line ' + err.lineNumber + ')');
        }

        console.log('4');
        if (req.readyState == 4) { // only if req is "loaded"
            console.log('5');
            if (req.status == 200) 
                { // only if "OK"
                console.log('6a');
                return req.responseText ;
                }
            else
                {
                console.log('6b');
                return "xml error: " + req.status +" "+req.statusText;
                }
            }
        }
    }  

This records the following information for Vimeo:

async url:
3a
try...

err name=[null]: err.message=[] (line 204)
3b
about to send...
err name=[NS_ERROR_NOT_INITIALIZED]: err.message=[Component not initialized] (line 211)
4

(Line 204 corresponds to req.open("GET", url2, false); and line 211 to req.send("");)

And the following for YouTube:

async url:
3a
try...

statechanged
3b
about to send...
statechanged
4
5
6a

What could be causing this issue? Any suggestions on how to address it?

Answer №1

After a stroke of luck, I managed to uncover the root cause of this issue that had eluded my debugging efforts. For those who may encounter the same problem, here is how I successfully resolved it:

The culprit turned out to be my JavaScript blocker (NoScript) which was obstructing the vimeo.com domain, essential for the XMLHttpRequest process. Despite the fact that my server wasn't blocked and didn't utilize any external scripts, noticing the list of blocked domains raised suspicions. Hence, upon enabling vimeo.com and retrying the process, everything functioned flawlessly. It appears that the underlying issue lies in how XMLHttpRequest operates, potentially attempting to execute the http request on a different domain as a javascript call or something along those lines (perhaps someone more versed in this area can provide clarification). Nevertheless, employing this solution effectively resolved my predicament. Hopefully, this insight proves beneficial to others navigating the same frustration.

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