title: swift , upload image to php server with alamofire
body: <p>i upload photo with alamofird with this code :</p>
  
  <pre><code>Alamofire.upload(.POST, Url, multipartFormData: {
              multipartFormData in
              if let Data = UIImagePNGRepresentation(imageData) {
                  multipartFormData.appendBodyPart(data: Data, name: "file", fileName: filename+".png", mimeType: "image/png")
                  //print(Data)
              }
              multipartFormData.appendBodyPart(data: sessionId.dataUsingEncoding(NSUTF16LittleEndianStringEncoding)!, name: "session_id")
              multipartFormData.appendBodyPart(data: NSUserDefaults.standardUserDefaults().stringForKey("user_id")!.dataUsingEncoding(NSUTF8StringEncoding)!, name: "sender_id")
  
              }, encodingCompletion: {
                  encodingResult in
                  switch encodingResult {
                  case .Success(let upload, _, _):
                      upload.responseJSON { response in
                          print(response)
                          //var data = JSON(response.result.value!)
                      }
                  case .Failure(let encodingError):
                      print(encodingError)
                  }
          })
  </code></pre>
  
  <p>and i have following Error : <br></p>
  
  <blockquote>
    <p><strong>FAILURE: Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0." UserInfo={NSDebugDescription=Invalid value around
    character 0.}</strong><br></p>
  </blockquote>
  
  <p>and from to day ago this code was working </p>