How to upload binary content with Firefox extension?

Question

In my Firefox extension I download the file, then the extension should upload it. I do the following -

// downloading fil         


        

Answer 1

Don't create the POST body yourself, instead use the FormData object.

var formData = Components.classes["@mozilla.org/files/formdata;1"].createInstance(Components.interfaces.nsIDOMFormData);
formData.append(key, value);

formData.append("file", File(file));