	@Test
	public void filter_forward_to_static_4() throws IOException, ServletException {

		RouterFilter routerFilter = new RouterFilter();
		
		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/src/a.js");
		request.setServletPath("/src/a.js");
		MockHttpServletResponse response = new MockHttpServletResponse();
		MockFilterChain chain = new MockFilterChain() {

			@Override
			public void doFilter(ServletRequest request, ServletResponse response)
					throws IOException, ServletException {
				request.setAttribute("a", "1");
				super.doFilter(request, response);
			}
			
		};
		assertThat(request.getAttribute("a")).isNull();;
		routerFilter.doFilter(request, response, chain);
		// 即没有做处理，依然是 /src/a.js
		assertThat(response.getForwardedUrl()).isNull();;
		assertThat(request.getAttribute("a")).isEqualTo("1");
	}