@Test
  public void testMessageContentsNotAvailableWithoutAggregation() throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/endpoint"), Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    final AtomicBoolean requestContentsNull = new AtomicBoolean(false);
    final AtomicBoolean responseContentsNull = new AtomicBoolean(false);

    proxy.addFirstHttpFilterFactory(
        new RequestFilterAdapter.FilterSource(
            new RequestFilter() {
              @Override
              public HttpResponse filterRequest(
                  HttpRequest request, HttpMessageContents contents, HttpMessageInfo messageInfo) {
                if (contents == null) {
                  requestContentsNull.set(true);
                }

                return null;
              }
            },
            0));

    proxy.addFirstHttpFilterFactory(
        new ResponseFilterAdapter.FilterSource(
            new ResponseFilter() {
              @Override
              public void filterResponse(
                  HttpResponse response,
                  HttpMessageContents contents,
                  HttpMessageInfo messageInfo) {
                if (contents == null) {
                  responseContentsNull.set(true);
                }
              }
            },
            0));

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(new HttpGet("http://localhost:" + mockServerPort + "/endpoint"));

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertTrue(
          "Expected HttpMessageContents to be null in RequestFilter because HTTP message aggregation is disabled",
          requestContentsNull.get());
      assertTrue(
          "Expected HttpMessageContents to be null in ResponseFilter because HTTP message aggregation is disabled",
          responseContentsNull.get());
    }
  }
  /** Helper method for executing response modification tests. */
  private void testModifiedResponse(final String originalText, final String newText)
      throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/modifyresponse"), Times.exactly(1))
        .respond(
            response()
                .withStatusCode(200)
                .withHeader(new Header(HttpHeaders.Names.CONTENT_TYPE, "text/plain; charset=utf-8"))
                .withBody(originalText));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    proxy.addFirstHttpFilterFactory(
        new HttpFiltersSourceAdapter() {
          @Override
          public HttpFilters filterRequest(HttpRequest originalRequest) {
            return new HttpFiltersAdapter(originalRequest) {
              @Override
              public HttpObject proxyToClientResponse(HttpObject httpObject) {
                if (httpObject instanceof FullHttpResponse) {
                  FullHttpResponse httpResponseAndContent = (FullHttpResponse) httpObject;

                  String bodyContent = HttpObjectUtil.extractHttpEntityBody(httpResponseAndContent);

                  if (bodyContent.equals(originalText)) {
                    HttpObjectUtil.replaceTextHttpEntityBody(httpResponseAndContent, newText);
                  }
                }

                return super.proxyToClientResponse(httpObject);
              }
            };
          }

          @Override
          public int getMaximumResponseBufferSizeInBytes() {
            return 10000;
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(new HttpGet("http://localhost:" + mockServerPort + "/modifyresponse"));
      String responseBody =
          NewProxyServerTestUtil.toStringAndClose(response.getEntity().getContent());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals("Did not receive expected response from mock server", newText, responseBody);
    }
  }
  @Test
  public void testResponseFilterOriginalRequestNotModified() throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/modifiedendpoint"), Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    proxy.addRequestFilter(
        new RequestFilter() {
          @Override
          public HttpResponse filterRequest(
              HttpRequest request, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            if (request.getUri().endsWith("/originalendpoint")) {
              request.setUri(request.getUri().replaceAll("originalendpoint", "modifiedendpoint"));
            }

            return null;
          }
        });

    final AtomicReference<String> originalRequestUri = new AtomicReference<>();

    proxy.addResponseFilter(
        new ResponseFilter() {
          @Override
          public void filterResponse(
              HttpResponse response, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            originalRequestUri.set(messageInfo.getOriginalRequest().getUri());
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(
              new HttpGet("http://localhost:" + mockServerPort + "/originalendpoint"));

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertThat(
          "Expected URI on originalRequest to match actual URI of original HTTP request",
          originalRequestUri.get(),
          endsWith("/originalendpoint"));
    }
  }
  @Test
  public void testCanModifyRequest() throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/modifyrequest"), Times.exactly(1))
        .respond(
            response()
                .withStatusCode(200)
                .withHeader(new Header(HttpHeaders.Names.CONTENT_TYPE, "text/plain; charset=utf-8"))
                .withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    proxy.addFirstHttpFilterFactory(
        new HttpFiltersSourceAdapter() {
          @Override
          public HttpFilters filterRequest(HttpRequest originalRequest) {
            return new HttpFiltersAdapter(originalRequest) {
              @Override
              public HttpResponse clientToProxyRequest(HttpObject httpObject) {
                if (httpObject instanceof HttpRequest) {
                  HttpRequest httpRequest = (HttpRequest) httpObject;
                  httpRequest.setUri(
                      httpRequest.getUri().replace("/originalrequest", "/modifyrequest"));
                }

                return super.clientToProxyRequest(httpObject);
              }
            };
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(
              new HttpGet("http://localhost:" + mockServerPort + "/originalrequest"));
      String responseBody =
          NewProxyServerTestUtil.toStringAndClose(response.getEntity().getContent());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals("Did not receive expected response from mock server", "success", responseBody);
    }
  }
  @Test
  public void testResponseFilterCanModifyHttpsTextContents() throws IOException {
    final String originalText = "The quick brown fox jumps over the lazy dog";
    final String newText = "The quick brown fox jumped.";

    mockServer
        .when(request().withMethod("GET").withPath("/modifyresponse"), Times.exactly(1))
        .respond(
            response()
                .withStatusCode(200)
                .withHeader(new Header(HttpHeaders.Names.CONTENT_TYPE, "text/plain; charset=utf-8"))
                .withBody(originalText));

    proxy = new BrowserMobProxyServer();
    proxy.setTrustAllServers(true);
    proxy.start();

    proxy.addResponseFilter(
        new ResponseFilter() {
          @Override
          public void filterResponse(
              HttpResponse response, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            if (contents.isText()) {
              if (contents.getTextContents().equals(originalText)) {
                contents.setTextContents(newText);
              }
            }
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      HttpGet request = new HttpGet("https://localhost:" + mockServerPort + "/modifyresponse");
      request.addHeader("Accept-Encoding", "gzip");
      CloseableHttpResponse response = httpClient.execute(request);
      String responseBody =
          NewProxyServerTestUtil.toStringAndClose(response.getEntity().getContent());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals("Did not receive expected response from mock server", newText, responseBody);
    }
  }
  @Test
  public void testRequestFilterCanModifyHttpsRequestBody() throws IOException {
    final String originalText = "original body";
    final String newText = "modified body";

    mockServer
        .when(
            request().withMethod("PUT").withPath("/modifyrequest").withBody(newText),
            Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.setTrustAllServers(true);
    proxy.start();

    proxy.addRequestFilter(
        new RequestFilter() {
          @Override
          public HttpResponse filterRequest(
              HttpRequest request, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            if (contents.isText()) {
              if (contents.getTextContents().equals(originalText)) {
                contents.setTextContents(newText);
              }
            }

            return null;
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      HttpPut request = new HttpPut("https://localhost:" + mockServerPort + "/modifyrequest");
      request.setEntity(new StringEntity(originalText));
      CloseableHttpResponse response = httpClient.execute(request);
      String responseBody =
          NewProxyServerTestUtil.toStringAndClose(response.getEntity().getContent());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals("Did not receive expected response from mock server", "success", responseBody);
    }
  }
  @Test
  public void testMitmDisabledHttpsRequestFilterNotAvailable() throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/mitmdisabled"), Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.setMitmDisabled(true);

    proxy.start();

    final AtomicBoolean connectRequestFilterFired = new AtomicBoolean(false);
    final AtomicBoolean getRequestFilterFired = new AtomicBoolean(false);

    proxy.addRequestFilter(
        new RequestFilter() {
          @Override
          public HttpResponse filterRequest(
              HttpRequest request, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            if (request.getMethod().equals(HttpMethod.CONNECT)) {
              connectRequestFilterFired.set(true);
            } else if (request.getMethod().equals(HttpMethod.GET)) {
              getRequestFilterFired.set(true);
            }
            return null;
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(new HttpGet("https://localhost:" + mockServerPort + "/mitmdisabled"));

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());

      assertTrue("Expected request filter to fire on CONNECT", connectRequestFilterFired.get());
      assertFalse(
          "Expected request filter to fail to fire on GET because MITM is disabled",
          getRequestFilterFired.get());
    }
  }
  @Test
  public void testResponseFilterCanModifyBinaryContents() throws IOException {
    final byte[] originalBytes = new byte[] {1, 2, 3, 4, 5};
    final byte[] newBytes = new byte[] {20, 30, 40, 50, 60};

    mockServer
        .when(request().withMethod("GET").withPath("/modifyresponse"), Times.exactly(1))
        .respond(
            response()
                .withStatusCode(200)
                .withHeader(new Header(HttpHeaders.Names.CONTENT_TYPE, "application/octet-stream"))
                .withBody(originalBytes));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    proxy.addResponseFilter(
        new ResponseFilter() {
          @Override
          public void filterResponse(
              HttpResponse response, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            if (!contents.isText()) {
              if (Arrays.equals(originalBytes, contents.getBinaryContents())) {
                contents.setBinaryContents(newBytes);
              }
            }
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      HttpGet request = new HttpGet("http://localhost:" + mockServerPort + "/modifyresponse");
      CloseableHttpResponse response = httpClient.execute(request);
      byte[] responseBytes =
          org.apache.commons.io.IOUtils.toByteArray(response.getEntity().getContent());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertThat(
          "Did not receive expected response from mock server", responseBytes, equalTo(newBytes));
    }
  }
  @Test
  public void testMitmDisabledHttpsResponseFilterNotAvailable() throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/mitmdisabled"), Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.setMitmDisabled(true);

    proxy.start();

    // unlike the request filter, the response filter doesn't fire when the 200 response to the
    // CONNECT is sent to the client.
    // this is because the response filter is triggered when the serverToProxyResponse() filtering
    // method is called, and
    // the "200 Connection established" is generated by the proxy itself.

    final AtomicBoolean responseFilterFired = new AtomicBoolean(false);

    proxy.addResponseFilter(
        new ResponseFilter() {
          @Override
          public void filterResponse(
              HttpResponse response, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            responseFilterFired.set(true);
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(new HttpGet("https://localhost:" + mockServerPort + "/mitmdisabled"));

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertFalse(
          "Expected response filter to fail to fire because MITM is disabled",
          responseFilterFired.get());
    }
  }
  @Test
  public void testResponseInterceptorWithoutBody() throws IOException {
    mockServer
        .when(request().withMethod("HEAD").withPath("/interceptortest"), Times.exactly(1))
        .respond(
            response()
                .withStatusCode(200)
                .withHeader(
                    new Header(HttpHeaders.Names.CONTENT_TYPE, "application/octet-stream")));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    final AtomicReference<byte[]> responseContents = new AtomicReference<>();

    proxy.addResponseFilter(
        new ResponseFilter() {
          @Override
          public void filterResponse(
              HttpResponse response, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            responseContents.set(contents.getBinaryContents());
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(
              new HttpHead("http://localhost:" + mockServerPort + "/interceptortest"));

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals(
          "Expected binary contents captured in interceptor to be empty",
          0,
          responseContents.get().length);
    }
  }
  @Test
  public void testHttpsResponseFilterUrlReflectsModifications() throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/urlreflectsmodifications"), Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.setTrustAllServers(true);
    proxy.start();

    final AtomicReference<String> requestFilterOriginalUrl = new AtomicReference<>();
    final AtomicReference<String> requestFilterUrl = new AtomicReference<>();

    proxy.addRequestFilter(
        new RequestFilter() {
          @Override
          public HttpResponse filterRequest(
              HttpRequest request, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            requestFilterOriginalUrl.set(messageInfo.getOriginalUrl());
            requestFilterUrl.set(messageInfo.getUrl());
            return null;
          }
        });

    // request filters get added to the beginning of the filter chain, so add this uri-modifying
    // request filter after
    // adding the capturing request filter above.
    proxy.addRequestFilter(
        new RequestFilter() {
          @Override
          public HttpResponse filterRequest(
              HttpRequest request, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            if (request.getUri().endsWith("/originalurl")) {
              String newUrl =
                  request.getUri().replaceAll("originalurl", "urlreflectsmodifications");
              request.setUri(newUrl);
            }
            return null;
          }
        });

    final AtomicReference<String> responseFilterOriginalUrl = new AtomicReference<>();
    final AtomicReference<String> responseFilterUrl = new AtomicReference<>();

    proxy.addResponseFilter(
        new ResponseFilter() {
          @Override
          public void filterResponse(
              HttpResponse response, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            responseFilterOriginalUrl.set(messageInfo.getOriginalUrl());
            responseFilterUrl.set(messageInfo.getUrl());
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      String originalRequestUrl = "https://localhost:" + mockServerPort + "/originalurl";
      String modifiedRequestUrl =
          "https://localhost:" + mockServerPort + "/urlreflectsmodifications";
      CloseableHttpResponse response = httpClient.execute(new HttpGet(originalRequestUrl));

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals(
          "Expected originalUrl in request filter to match actual request URL",
          originalRequestUrl,
          requestFilterOriginalUrl.get());
      assertEquals(
          "Expected url in request filter to match modified request URL",
          modifiedRequestUrl,
          requestFilterUrl.get());

      assertEquals(
          "Expected originalUrl in response filter to match actual request URL",
          originalRequestUrl,
          responseFilterOriginalUrl.get());
      assertEquals(
          "Expected url in response filter to match modified request URL",
          modifiedRequestUrl,
          responseFilterUrl.get());
    }
  }
  @Test
  public void testHttpResponseFilterMessageInfoPopulated() throws IOException {
    mockServer
        .when(
            request()
                .withMethod("GET")
                .withPath("/httpmessageinfopopulated")
                .withQueryStringParameter("param1", "value1"),
            Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    final AtomicReference<ChannelHandlerContext> requestCtx = new AtomicReference<>();
    final AtomicReference<HttpRequest> requestOriginalRequest = new AtomicReference<>();
    final AtomicBoolean requestIsHttps = new AtomicBoolean(false);
    final AtomicReference<String> requestFilterOriginalUrl = new AtomicReference<>();
    final AtomicReference<String> requestFilterUrl = new AtomicReference<>();

    proxy.addRequestFilter(
        new RequestFilter() {
          @Override
          public HttpResponse filterRequest(
              HttpRequest request, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            requestCtx.set(messageInfo.getChannelHandlerContext());
            requestOriginalRequest.set(messageInfo.getOriginalRequest());
            requestIsHttps.set(messageInfo.isHttps());
            requestFilterOriginalUrl.set(messageInfo.getOriginalUrl());
            requestFilterUrl.set(messageInfo.getUrl());
            return null;
          }
        });

    final AtomicReference<ChannelHandlerContext> responseCtx = new AtomicReference<>();
    final AtomicReference<HttpRequest> responseOriginalRequest = new AtomicReference<>();
    final AtomicBoolean responseIsHttps = new AtomicBoolean(false);
    final AtomicReference<String> responseFilterOriginalUrl = new AtomicReference<>();
    final AtomicReference<String> responseFilterUrl = new AtomicReference<>();

    proxy.addResponseFilter(
        new ResponseFilter() {
          @Override
          public void filterResponse(
              HttpResponse response, HttpMessageContents contents, HttpMessageInfo messageInfo) {
            responseCtx.set(messageInfo.getChannelHandlerContext());
            responseOriginalRequest.set(messageInfo.getOriginalRequest());
            responseIsHttps.set(messageInfo.isHttps());
            responseFilterOriginalUrl.set(messageInfo.getOriginalUrl());
            responseFilterUrl.set(messageInfo.getUrl());
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      String requestUrl =
          "http://localhost:" + mockServerPort + "/httpmessageinfopopulated?param1=value1";
      CloseableHttpResponse response = httpClient.execute(new HttpGet(requestUrl));

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertNotNull(
          "Expected ChannelHandlerContext to be populated in request filter", requestCtx.get());
      assertNotNull(
          "Expected originalRequest to be populated in request filter",
          requestOriginalRequest.get());
      assertFalse("Expected isHttps to return false in request filter", requestIsHttps.get());
      assertEquals(
          "Expected originalUrl in request filter to match actual request URL",
          requestUrl,
          requestFilterOriginalUrl.get());
      assertEquals(
          "Expected url in request filter to match actual request URL",
          requestUrl,
          requestFilterUrl.get());

      assertNotNull(
          "Expected ChannelHandlerContext to be populated in response filter", responseCtx.get());
      assertNotNull(
          "Expected originalRequest to be populated in response filter",
          responseOriginalRequest.get());
      assertFalse("Expected isHttps to return false in response filter", responseIsHttps.get());
      assertEquals(
          "Expected originalUrl in response filter to match actual request URL",
          requestUrl,
          responseFilterOriginalUrl.get());
      assertEquals(
          "Expected url in response filter to match actual request URL",
          requestUrl,
          responseFilterUrl.get());
    }
  }
  @Test
  public void testCanBypassFilterForRequest() throws IOException, InterruptedException {
    mockServer
        .when(request().withMethod("GET").withPath("/bypassfilter"), Times.exactly(2))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    final AtomicInteger filtersSourceHitCount = new AtomicInteger();
    final AtomicInteger filterHitCount = new AtomicInteger();

    proxy.addFirstHttpFilterFactory(
        new HttpFiltersSourceAdapter() {
          @Override
          public HttpFilters filterRequest(HttpRequest originalRequest) {
            if (filtersSourceHitCount.getAndIncrement() == 0) {
              return null;
            } else {
              return new HttpFiltersAdapter(originalRequest) {
                @Override
                public void serverToProxyResponseReceived() {
                  filterHitCount.incrementAndGet();
                }
              };
            }
          }
        });

    // during the first request, the filterRequest(...) method should return null, which will
    // prevent the filter instance from
    // being added to the filter chain
    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(new HttpGet("http://localhost:" + mockServerPort + "/bypassfilter"));
      String responseBody =
          NewProxyServerTestUtil.toStringAndClose(response.getEntity().getContent());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals("Did not receive expected response from mock server", "success", responseBody);
    }

    Thread.sleep(500);

    assertEquals(
        "Expected filters source to be invoked on first request", 1, filtersSourceHitCount.get());
    assertEquals(
        "Expected filter instance to be bypassed on first request", 0, filterHitCount.get());

    // during the second request, the filterRequest(...) method will return a filter instance, which
    // should be invoked during processing
    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(new HttpGet("http://localhost:" + mockServerPort + "/bypassfilter"));
      String responseBody =
          NewProxyServerTestUtil.toStringAndClose(response.getEntity().getContent());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals("Did not receive expected response from mock server", "success", responseBody);
    }

    Thread.sleep(500);

    assertEquals(
        "Expected filters source to be invoked again on second request",
        2,
        filtersSourceHitCount.get());
    assertEquals(
        "Expected filter instance to be invoked on second request (only)", 1, filterHitCount.get());
  }
  @Test
  public void testCanShortCircuitResponse() throws IOException {
    mockServer
        .when(request().withMethod("GET").withPath("/regular200"), Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    // this response should be "short-circuited" by the interceptor
    mockServer
        .when(request().withMethod("GET").withPath("/shortcircuit204"), Times.exactly(1))
        .respond(response().withStatusCode(200).withBody("success"));

    proxy = new BrowserMobProxyServer();
    proxy.start();

    final AtomicBoolean interceptorFired = new AtomicBoolean(false);
    final AtomicBoolean shortCircuitFired = new AtomicBoolean(false);

    proxy.addFirstHttpFilterFactory(
        new HttpFiltersSourceAdapter() {
          @Override
          public HttpFilters filterRequest(HttpRequest originalRequest) {
            return new HttpFiltersAdapter(originalRequest) {
              @Override
              public HttpResponse clientToProxyRequest(HttpObject httpObject) {
                if (httpObject instanceof HttpRequest) {
                  interceptorFired.set(true);

                  HttpRequest httpRequest = (HttpRequest) httpObject;

                  if (httpRequest.getMethod().equals(HttpMethod.GET)
                      && httpRequest.getUri().contains("/shortcircuit204")) {
                    HttpResponse httpResponse =
                        new DefaultHttpResponse(
                            httpRequest.getProtocolVersion(), HttpResponseStatus.NO_CONTENT);

                    shortCircuitFired.set(true);

                    return httpResponse;
                  }
                }

                return super.clientToProxyRequest(httpObject);
              }
            };
          }
        });

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(new HttpGet("http://localhost:" + mockServerPort + "/regular200"));
      String responseBody =
          NewProxyServerTestUtil.toStringAndClose(response.getEntity().getContent());

      assertTrue("Expected interceptor to fire", interceptorFired.get());
      assertFalse(
          "Did not expected short circuit interceptor code to execute", shortCircuitFired.get());

      assertEquals(
          "Expected server to return a 200", 200, response.getStatusLine().getStatusCode());
      assertEquals("Did not receive expected response from mock server", "success", responseBody);
    }

    interceptorFired.set(false);

    try (CloseableHttpClient httpClient =
        NewProxyServerTestUtil.getNewHttpClient(proxy.getPort())) {
      CloseableHttpResponse response =
          httpClient.execute(
              new HttpGet("http://localhost:" + mockServerPort + "/shortcircuit204"));

      assertTrue("Expected interceptor to fire", interceptorFired.get());
      assertTrue("Expected interceptor to short-circuit response", shortCircuitFired.get());

      assertEquals(
          "Expected interceptor to return a 204 (No Content)",
          204,
          response.getStatusLine().getStatusCode());
      assertNull("Expected no entity attached to response", response.getEntity());
    }
  }