Why does this jQuery Ajax call fail ONLY in IE9 (Even works fine in IE8 and IE7)

Well I finally tracked down the problem. It turns out that for some reason jQuery/IE does not correctly urlencode double quotes. The URL of the request was:

/search.json?callback=jQuery16105234487927080267_1313510362362&q=stocks OR "stock market" -blueprint -empireavenue.com -learn&_=1313510362469

In every other browser by the time jQuery performed the ajax request it looked like:

/search.json?callback=jQuery16105234487927080267_1313510362362&q=stocks%20OR%20%22stock%20market%22%20-blueprint%20-empireavenue.com%20-learn&_=1313510362469

but for whatever reason in all versions of IE it came out like this:

/search.json?callback=jQuery16105234487927080267_1313510362362&q=stocks%20OR%20"stock%20market"%20-blueprint%20-empireavenue.com%20-learn&_=1313510362469

which caused the server to return no data.

Are you sure that the URL you're calling (/index.php?option=com_content&view=article&id=45&tmpl=component) works in IE9? If you load that PHP page up in IE9, does it return the expected result? It should do, but it's worth checking that the error is in the jQuery call, rather than the PHP.

Also, a POST call would usually be to a page like 'index.php', with the query string (option=com_content, view=article etc.) sent as the variable postVars.

Try using the following:

$.ajax({    type: "POST",    url: "index.php",    data: {        option : com_content,        view : article,        id : 45,        tmpl : component    },    success: function(msg){        console.log(msg);    },    error: function(jqXHR, textStatus, errorThrown) {        console.log(textStatus)    }});

Strip down the function to its basic parts, and you should be able to see where the error is coming from.