Can safari/chrome/opera make ajax requests while an upload is in progress?

As per I know there can be two request for one server domain can be active for the browser. That is if your server domain name is 'code.mydomain.com' then there can be atmost 2 request open at a time. In your case first one is file uploading request.

You have to check do you have any other active request apart form uploading in specified browsers.

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