multipartform encoding image woes

gistfile1.js

    var fileBody = fs.readFileSync(image1, 'binary')
    var fileName = path.basename(image1)
    var mimeType = mime.lookup(image1)
    console.log(mimeType)

    var headers = {
      'Accept': 'application/json',
      'Content-Type': 'multipart/form-data; boundary=----WebKitFormBoundaryMfJEpQcCbybb6A8U'
    }

    var body = [
      '------WebKitFormBoundaryMfJEpQcCbybb6A8U',
      'Content-Disposition: form-data; name="caption"',
      '',
      'a caption',
      '------WebKitFormBoundaryMfJEpQcCbybb6A8U',
      'Content-Disposition: file; name="attachment"; filename="'+fileName+'"',
      'Content-Type: ' + mimeType,
      'Content-Transfer-Encoding: binary',
      'Content-Length' + Buffer.byteLength(fileBody),
      '',
      fileBody,
      '------WebKitFormBoundaryMfJEpQcCbybb6A8U--\r\n'
    ].join('\r\n')