Intermittent xhrPost failure

[jeffg]

I'm testing my code under a variety of browsers including Safari 3 (windows). The same xhrPost code seems to work reliably on all but Safari. I occasionally see the xhrPost get an error response and the status is zero. (tk has also seen this but on FF under OSX). The server is not sent anything.

Is this a bug or an expected condition that requires the client to retry again when it occurs? (yikes!)

The relevant code snippet goes something like this:

    <script type="text/javascript"
        src="<?=$docURL?>/dojo.x/dojo/dojo.js"
        djConfig="parseOnLoad: true, usePlainJson: true"></script>
...

dojo.xhrPost( {
    url: _urlAjax,
    content: {'ver' : 1, 'func': 'poll', 'args':jsonStr },
    handleAs: "json", 
    timeout: g_timeout, // Time in milliseconds
    handle: function(response, ioArgs){
        if( response instanceof Error && ioArgs.xhr.status === 0 )
            console.debug( "WTF?");
        else console.debug( "normal");
      }

[dante]

jeffg: could i bribe you into make a test case that calls an xhrPost over and over and over looking for the failing condition?

[guest]

Replying to dante:

jeffg: could i bribe you into make a test case that calls an xhrPost over and over and over looking for the failing condition?

I could use the money...

I can see that it is getting the the error in xhr.js line 581 (Unable to load" with status =0, if that helps.

It's just a loop via setTimeout of an xhrPost doing an ajax request... tk also has this issue. It shows up more on webkit than on FF... If get a chance to create aample I will..., else...

[jburke]

Test file, place in dojo/tests/_base directory.

[jburke]

PHP endpoint for test file. Also place in dojo/tests/_base

[jburke]

I just attached an xhrInterval.html and xhrInterval.php test file. I have run it for about 5 minutes with Firefox 3.0.1 and Safari 3.1.2 on OS X, and I do not see the error condition.

Both browsers were revved since this report, so maybe something got magically fixed? Closing this as unreproducible, but feel free to modify the test case and reopen if a reproducible error can be found.