This is a sample project to show issues of CORS uploads in FireFox with Exoscale. DO NOT USE ANY OF THIS CODE IN PRODUCTION.

• 1. Sign up and make a bucket on Exoscale's portal.
• 2. Setup backend/backend-server with bucket, API Key and secret.
• 3. Setup CORS configuration:

<?xml version="1.0" ?>
<CORSConfiguration xmlns="http:https://s3.amazonaws.com/doc/2006-03-01/">
  <CORSRule>
    <AllowedOrigin>WHATEVER OTHER DOMAIN YOU WANT TO TRY</AllowedOrigin>
    <AllowedOrigin>http:https://localhost:8080</AllowedOrigin>
    <AllowedMethod>PUT</AllowedMethod>
    <AllowedHeader>Authorization</AllowedHeader>
    <AllowedHeader>Content-Type</AllowedHeader>
    <AllowedHeader>Host</AllowedHeader>
  </CORSRule>
</CORSConfiguration>

• 4. Launch terminal at root of the repository and run python backend/backend-server.py
• 5. Open browser at http:https://localhost:8080/client/test.html in Chrome and upload a file
• 6. The console doesn't report any CORS errors and the file should be in your bucket.
• 7. Do the same in FireFox, and notice the following CORS issue in the console Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://sos.exo.io/XXXX. (Reason: CORS header 'Access-Control-Allow-Origin' missing).

Adding <AllowedHeader>Access-Control-Allow-Origin</AllowedHeader> to configuration doesn't help.