diff --git a/scm-webapp/pom.xml b/scm-webapp/pom.xml
index b30833a968..c7218797eb 100644
--- a/scm-webapp/pom.xml
+++ b/scm-webapp/pom.xml
@@ -348,6 +348,12 @@
       <scope>test</scope>
     </dependency>
     
+    <dependency>
+      <groupId>com.github.sdorra</groupId>
+      <artifactId>shiro-unit</artifactId>
+      <version>1.0.0</version>
+    </dependency>
+    
     <!-- global excludes -->
     
     <dependency>
diff --git a/scm-webapp/src/main/java/sonia/scm/filter/MDCFilter.java b/scm-webapp/src/main/java/sonia/scm/filter/MDCFilter.java
index 6630543bc3..5c14269ffb 100644
--- a/scm-webapp/src/main/java/sonia/scm/filter/MDCFilter.java
+++ b/scm-webapp/src/main/java/sonia/scm/filter/MDCFilter.java
@@ -33,6 +33,7 @@ package sonia.scm.filter;
 
 //~--- non-JDK imports --------------------------------------------------------
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.inject.Singleton;
 
 import org.apache.shiro.SecurityUtils;
@@ -61,13 +62,20 @@ public class MDCFilter extends HttpFilter
 {
 
   /** Field description */
-  private static final String MDC_CLIEN_HOST = "client_host";
+  @VisibleForTesting
+  static final String MDC_CLIEN_HOST = "client_host";
 
   /** Field description */
-  private static final String MDC_CLIEN_IP = "client_ip";
+  @VisibleForTesting
+  static final String MDC_CLIEN_IP = "client_ip";
+  
+  /** url of the current request */
+  @VisibleForTesting
+  static final String MDC_REQUEST_URI = "request_uri";
 
   /** Field description */
-  private static final String MDC_USERNAME = "username";
+  @VisibleForTesting
+  static final String MDC_USERNAME = "username";
 
   //~--- methods --------------------------------------------------------------
 
@@ -90,6 +98,7 @@ public class MDCFilter extends HttpFilter
     MDC.put(MDC_USERNAME, getUsername());
     MDC.put(MDC_CLIEN_IP, request.getRemoteAddr());
     MDC.put(MDC_CLIEN_HOST, request.getRemoteHost());
+    MDC.put(MDC_REQUEST_URI, request.getRequestURI());
 
     try
     {
@@ -100,6 +109,7 @@ public class MDCFilter extends HttpFilter
       MDC.remove(MDC_USERNAME);
       MDC.remove(MDC_CLIEN_IP);
       MDC.remove(MDC_CLIEN_HOST);
+      MDC.remove(MDC_REQUEST_URI);
     }
   }
 
diff --git a/scm-webapp/src/test/java/sonia/scm/filter/MDCFilterTest.java b/scm-webapp/src/test/java/sonia/scm/filter/MDCFilterTest.java
new file mode 100644
index 0000000000..b5e1753c52
--- /dev/null
+++ b/scm-webapp/src/test/java/sonia/scm/filter/MDCFilterTest.java
@@ -0,0 +1,128 @@
+/***
+ * Copyright (c) 2015, Sebastian Sdorra
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of SCM-Manager; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * https://bitbucket.org/sdorra/scm-manager
+ * 
+ */
+
+package sonia.scm.filter;
+
+import com.github.sdorra.shiro.ShiroRule;
+import com.github.sdorra.shiro.SubjectAware;
+import java.io.IOException;
+import java.util.Map;
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.junit.Test;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+import org.junit.Rule;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.slf4j.MDC;
+import sonia.scm.AbstractTestBase;
+
+/**
+ * Unit tests for {@link MDCFilter}.
+ * 
+ * @author Sebastian Sdorra <sebastian.sdorra@gmail.com>
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class MDCFilterTest extends AbstractTestBase {
+  
+  @Rule
+  public ShiroRule shiro = new ShiroRule();
+  
+  @Mock
+  private HttpServletRequest request;
+  
+  @Mock
+  private HttpServletResponse response;
+  
+  private final MDCFilter filter = new MDCFilter();
+
+  /**
+   * Tests {@link MDCFilter#doFilter(HttpServletRequest, HttpServletResponse, FilterChain)}.
+   * 
+   * @throws IOException
+   * @throws ServletException 
+   */
+  @Test
+  @SubjectAware(
+    username = "trillian",
+    password = "secret",
+    configuration = "classpath:sonia/scm/shiro-001.ini"
+  )
+  public void testDoFilter() throws IOException, ServletException
+  {
+    when(request.getRequestURI()).thenReturn("api/v1/repositories");
+    when(request.getRemoteAddr()).thenReturn("127.0.0.1");
+    when(request.getRemoteHost()).thenReturn("localhost");
+    
+    MDCCapturingFilterChain chain = new MDCCapturingFilterChain();
+    filter.doFilter(request, response, chain);
+    
+    assertNotNull(chain.ctx);
+    assertEquals("trillian", chain.ctx.get(MDCFilter.MDC_USERNAME));
+    assertEquals("api/v1/repositories", chain.ctx.get(MDCFilter.MDC_REQUEST_URI));
+    assertEquals("127.0.0.1", chain.ctx.get(MDCFilter.MDC_CLIEN_IP));
+    assertEquals("localhost", chain.ctx.get(MDCFilter.MDC_CLIEN_HOST));
+  }
+  
+  /**
+   * Tests {@link MDCFilter#doFilter(HttpServletRequest, HttpServletResponse, FilterChain)} as anonymous user.
+   * 
+   * @throws IOException
+   * @throws ServletException 
+   */
+  @Test
+  @SubjectAware
+  public void testDoFilterAsAnonymous() throws IOException, ServletException {
+    MDCCapturingFilterChain chain = new MDCCapturingFilterChain();
+    filter.doFilter(request, response, chain);
+    
+    assertNotNull(chain.ctx);
+    assertEquals("anonymous", chain.ctx.get(MDCFilter.MDC_USERNAME));
+  }
+  
+  private static class MDCCapturingFilterChain implements FilterChain {
+
+    private Map<String, String> ctx;
+    
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {
+      this.ctx = MDC.getCopyOfContextMap();
+    }
+    
+  }
+
+}
\ No newline at end of file
diff --git a/scm-webapp/src/test/resources/sonia/scm/shiro-001.ini b/scm-webapp/src/test/resources/sonia/scm/shiro-001.ini
new file mode 100644
index 0000000000..0202162d00
--- /dev/null
+++ b/scm-webapp/src/test/resources/sonia/scm/shiro-001.ini
@@ -0,0 +1,6 @@
+[users]
+trillian = secret, user
+
+[roles]
+admin = *
+user = something:*