title: UT010006: Cannot call getWriter(), getOutputStream() already called
body: <p>I have got this error message when I'm trying to download file :</p>
  
  <p>Could not handle exception!: java.lang.IllegalStateException: UT010006: Cannot call getWriter(), getOutputStream() already called.</p>
  
  <p>File is downloaded but without extension. So browser ask me what program should be use to read it.</p>
  
  <p>This is my downloading code:</p>
  
  <pre><code>    InputStream fileIs = null;
      OutputStream output = null;
      try {            
          ExternalContext externalContext = getContext().getExternalContext();
          externalContext.responseReset();
          externalContext.setResponseContentType(fileToDownload.getMetadata().getMimeType());
          externalContext.setResponseContentLength(fileToDownload.getMetadata().getTaille().intValue());
          externalContext.setResponseHeader("Content-Disposition", "attachment; filename=\"" + fileToDownload.getMetadata().getFileName() + "\"");
  
          output = externalContext.getResponseOutputStream();
          Response repGetFile = ClientBuilder.newClient()
                   .target(fileToDownload.getMetadata().getFileURL())
                   .request().header("Authorization", "Bearer bearercode")
                   .get();
  
          fileIs = repGetFile.readEntity(InputStream.class);
          int readBytes;
          byte[] buffer = new byte[1024];
          while((readBytes = fileIs.read(buffer)) &gt; 0){
              output.write(buffer, 0, readBytes);
          }
          output.flush();
  
      } catch (IOException ex) {
          LOG.log(Level.SEVERE, null, ex);
      } finally{
          try {
              fileIs.close();
              output.close();
          } catch (IOException ex) {
              LOG.log(Level.INFO, null, ex);
          }
      } 
  </code></pre>