extjs4 扩展ajax,extjs4 - Ajax.request using ExtJs - Stack Overflow

I'm having difficulty loading JSON content from a file. console.log prints "server-side failure with status code 0", meaning that the request failed.

My JSON file URL is correct and the file is present at the given address.

Firebug shows the error:

"NetworkError: 405 Not Allowed - http://localhost:8080/4910.json?_dc=1336714070619

and the Net tag shows status 405 not allowed.

Any ideas on why this is happening?

Ext.Ajax.request({

url: 'http://localhost:8080/4910.json',

success: function(response, opts) {

var obj = Ext.decode(response.responseText);

console.log(obj[0].name);

},

failure: function(response, opts) {

console.log('server-side failure with status code ' + response.status);

}

});

Also, what is adding the parameter _dc=1336714070619 to the end of the GET request?