code: public static Stream from(File file)
     {
        return new Stream(file) {
  
           @Override
           public void performHttp(HttpServletRewrite event, EvaluationContext context)
           {
              InputStream stream = null;
              try {
                 File file = new File(target.build(event, context, Transpositions.encodePath()));
                 stream = new BufferedInputStream(new FileInputStream(file));
                 log.debug("Streaming from file [" + file + "] to response.");
                 Response.write(stream).perform(event, context);
              }
              catch (Exception e) {
                 throw new RewriteException("Error streaming file.", e);
              }
              finally
              {
                 if (stream != null)
                    try {
                       stream.close();
                    }
                    catch (IOException e) {
                       throw new RewriteException("Error closing stream.", e);
                    }
              }
           }
  
           @Override
           public String toString()
           {
              return "Stream.from(\"" + target.getPattern() + "\")";
           }
        };
     }
docs: Create an {@link Operation} that streams the given {@link File} to the
  {@link HttpServletResponse#getOutputStream()}.
  
  <p>
  The given {@link File} path may be parameterized:
  <p>
  <code>
  new File("/tmp/file.txt") <br>
  new File("c:\tmp\{param}.txt") <br>
  ...
  </code>
  <p>
  
  @param location {@link ParameterizedPattern} specifying the location of the {@link File}.
  
  @see {@link ConfigurationRuleParameterBuilder#where(String)}