code: public void addHeaders(HttpServletRequest reqSource, HttpRequestBase httpTarget)
      {
      	Enumeration<?> headerNames = reqSource.getHeaderNames();
      	while (headerNames.hasMoreElements())
      	{
      		String key = headerNames.nextElement().toString();
      		if (CONTENT_LENGTH.equalsIgnoreCase(key))
      			continue;	// Length will be different
      		Enumeration<?> headers = reqSource.getHeaders(key);
      		while (headers.hasMoreElements())
      		{
      			String value = (String)headers.nextElement();
      			if (HOST.equalsIgnoreCase(key))
      			{
      				value = proxyURLPrefix;
      				if (value.indexOf(":") != -1)
      				{
      					value = value.substring(value.indexOf(":") + 1);
      					while (value.startsWith("/"))
      					{
      						value = value.substring(1);
      					}
      				}
      				if (value.indexOf("/") != -1)
      					value = value.substring(0, value.indexOf("/"));
      			}
      			httpTarget.setHeader(new BasicHeader(key, value));
      		}
      	}
      }
docs: Move the header info to the proxy request.
  @param reqSource
  @param httpTarget