How to send FormData objects with Ajax-requests in jQuery? [duplicate]

Answer 1

You can use the $.ajax beforeSend event to manipulate the header.

…

beforeSend: function(xhr) { 
    xhr.setRequestHeader('Content-Type', 'multipart/form-data');
}

…

See this link for additional information: http://msdn.microsoft.com/en-us/library/ms536752(v=vs.85).aspx