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Got is working my image conversion was wrong

i should have open the image with "rb" mode. i did not. i just read the file like this : File.read(file_url), which is not right.
i did that and it worked:
Ruby Code:

 File.open(file, 'rb') do |f|
    <Do the post request here for the attachment>
       response = RestClient.post(upload_url, f, {:multipart => true, :content_type => 'application/octet-stream' })
       token = JSON.parse(response)['upload']['token']

    <if receive token, Do the put request >
        response = RestClient.put(wiki_url, { :attachments => {
                                              :attachment1 => { # the hash key gets thrown away - name doesn't matter
                                                :token => token,
                                                :filename => file_name,
                                                :description => file_description # optional
                                              }
                                            },
                                            :wiki_page => {
                                              :text => file_content # wiki_text # original wiki text
                                            }
                                          })

 end