Plupload crossdomain upload 200 http error

Question

I would like to upload files to a remote server using the plupload library. Everything works with Chrome (32.0) and IE 10 using the html5 runtime but when I try with Firefox 27 (html5 runtime) or IE 8 (html4 runtime) I get an error Error #-200: HTTP Error..

Clientside script :

$(function() {
var uploader = new plupload.Uploader({
    browse_button: 'browse',
    url: 'https://remote.com/API/action.php',
    runtimes : 'html5,flash,silverlight,html4',
    flash_swf_url : './js/Moxie.swf',
    silverlight_xap_url : './js/Moxie.xap'
});

uploader.init();
uploader.settings.multipart_params = { 
       [...]
};

// PreInit events, bound before any internal events
uploader.bind('init', function(up, info) {
        console.log('[Init]', 'Info:', info, 'Features:', up.features);
        alert(info['runtime']);
});

uploader.bind('Error', function(up, err) {
    document.getElementById('console').innerHTML += "\nError #" + err.code + ": " + err.message;
});

document.getElementById('start-upload').onclick = function() {
    uploader.start();
};

});

First request with Chrome :

Request URL:https://remote.com/API/action.php
Request Method:OPTIONS
Status Code:200 OK

Second request with Chrome :

Request URL:https://remote.com/API/action.php
Request Method:POST
Status Code:200 OK

Request Headers

Accept:*/*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:fr-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4
Access-Control-Request-Headers:content-type
Access-Control-Request-Method:POST
Cache-Control:no-cache
Connection:keep-alive
Host:hipt.ucc.ie
Origin:http://server.com
Pragma:no-cache
Referer: XXX
User-Agent:Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36

Response Headers

Access-Control-Allow-Headers:Content-Type, Authorization, X-Requested-With
Access-Control-Allow-Methods:GET, PUT, POST, DELETE, OPTIONS
Access-Control-Allow-Origin:*
Access-Control-Max-Age:1000
Cache-Control:no-cache
Connection:close
Content-Length:5
Content-Type:text/html; charset=UTF-8
Date:Mon, 24 Feb 2014 11:57:54 GMT
Server:Apache/2.2.3 (CentOS)
X-Powered-By:PHP/5.1.6

Serverside script :

<?php

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');
header('Cache-Control: no-cache');
header('Access-Control-Max-Age: 1000');
header('Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With');

if (!empty($_FILES)) {

With Firefox the response to the request with the OPTIONS method is empty and there is no following POST request.

Here are the Firefox headers:

I cannot figure out why it is not working with Firefox and IE8.

Thanks for your help.

[EDIT] I just tried with flash runtimes: same thing it works with Chrome and IE 10 but not with Firefox and IE8. The weird thing is that the alert(info['runtime']); does not appear but there is no javascript error in the console...

Answer 1

Ok so I finally find out why it wasn't working. I checked using wireshark and I noticed that there was an encrypted alert.

I then check the certificate of the remote server using : http://www.sslshopper.com/ssl-checker.html and got this answer :

The certificate is not trusted in all web browsers. You may need to install an Intermediate/chain certificate to link it to a trusted root certificate. Learn more about this error. The fastest way to fix this problem is to contact your SSL provider.

I had to add an exception and it finally worked \o/