diff --git a/benchmarks/README.md b/benchmarks/README.md
new file mode 100644
index 000000000..59f571fc5
--- /dev/null
+++ b/benchmarks/README.md
@@ -0,0 +1,8 @@
+OkHttp Benchmarks
+=======================================
+
+This module allows you to test the performance of HTTP clients.
+
+### Running
+  1. If you made modifications to `com.squareup.okhttp.benchmarks.Benchmark` run `mvn compile`.
+  2. Run `mvn exec:exec` to launch a new JVM, which will execute the benchmark.
diff --git a/benchmarks/pom.xml b/benchmarks/pom.xml
index 14d93eeef..cecf86480 100644
--- a/benchmarks/pom.xml
+++ b/benchmarks/pom.xml
@@ -52,4 +52,30 @@
       <version>4.0.15.Final</version>
     </dependency>
   </dependencies>
+  <build>
+    <plugins>
+    <plugin>
+      <groupId>org.codehaus.mojo</groupId>
+      <artifactId>exec-maven-plugin</artifactId>
+      <executions>
+        <execution>
+          <goals>
+            <goal>java</goal>
+          </goals>
+        </execution>
+      </executions>
+      <configuration>
+        <executable>java</executable>
+        <arguments>
+          <argument>-Xms512m</argument>
+          <argument>-Xmx512m</argument>
+          <commandlineArgs>-Xbootclasspath/p:${settings.localRepository}/org/mortbay/jetty/npn/npn-boot/${npn.version}/npn-boot-${npn.version}.jar</commandlineArgs>
+          <argument>-classpath</argument>
+          <classpath/>
+          <argument>com.squareup.okhttp.benchmarks.Benchmark</argument>
+        </arguments>
+      </configuration>
+    </plugin>
+    </plugins>
+  </build>
 </project>
diff --git a/benchmarks/src/main/java/com/squareup/okhttp/benchmarks/Benchmark.java b/benchmarks/src/main/java/com/squareup/okhttp/benchmarks/Benchmark.java
index 16bd06350..fe23182fc 100644
--- a/benchmarks/src/main/java/com/squareup/okhttp/benchmarks/Benchmark.java
+++ b/benchmarks/src/main/java/com/squareup/okhttp/benchmarks/Benchmark.java
@@ -138,6 +138,7 @@ public class Benchmark {
       SSLContext sslContext = SslContextBuilder.localhost();
       server.useHttps(sslContext.getSocketFactory(), false);
       server.setNpnEnabled(true);
+      server.setNpnProtocols(protocols);
     }
 
     final MockResponse response = newResponse();
diff --git a/mockwebserver/src/main/java/com/squareup/okhttp/mockwebserver/MockWebServer.java b/mockwebserver/src/main/java/com/squareup/okhttp/mockwebserver/MockWebServer.java
index 90e2925e6..71c7c860f 100644
--- a/mockwebserver/src/main/java/com/squareup/okhttp/mockwebserver/MockWebServer.java
+++ b/mockwebserver/src/main/java/com/squareup/okhttp/mockwebserver/MockWebServer.java
@@ -106,6 +106,7 @@ public final class MockWebServer {
 
   private int port = -1;
   private boolean npnEnabled = true;
+  private List<Protocol> npnProtocols = Protocol.HTTP2_SPDY3_AND_HTTP;
 
   public int getPort() {
     if (port == -1) throw new IllegalStateException("Cannot retrieve port before calling play()");
@@ -165,6 +166,27 @@ public final class MockWebServer {
     this.npnEnabled = npnEnabled;
   }
 
+  /**
+   * Indicates the protocols supported by NPN on incoming HTTPS connections.
+   * This list is ignored when npn is disabled.
+   *
+   * @param protocols the protocols to use, in order of preference. The list
+   *     must contain "http/1.1". It must not contain null.
+   */
+  public void setNpnProtocols(List<Protocol> protocols) {
+    protocols = Util.immutableList(protocols);
+    if (!protocols.contains(Protocol.HTTP_11)) {
+      throw new IllegalArgumentException("protocols doesn't contain http/1.1: " + protocols);
+    }
+    if (protocols.contains(null)) {
+      throw new IllegalArgumentException("protocols must not contain null");
+    }
+    if (protocols.contains(ByteString.EMPTY)) {
+      throw new IllegalArgumentException("protocols contains an empty string");
+    }
+    this.npnProtocols = Util.immutableList(protocols);
+  }
+
   /**
    * Serve requests with HTTPS rather than otherwise.
    * @param tunnelProxy true to expect the HTTP CONNECT method before
@@ -304,8 +326,7 @@ public final class MockWebServer {
           openClientSockets.put(socket, true);
 
           if (npnEnabled) {
-            // TODO: expose means to select which protocols to advertise.
-            Platform.get().setNpnProtocols(sslSocket, Protocol.HTTP2_SPDY3_AND_HTTP);
+            Platform.get().setNpnProtocols(sslSocket, npnProtocols);
           }
 
           sslSocket.startHandshake();
diff --git a/okhttp/src/test/java/com/squareup/okhttp/internal/http/URLConnectionTest.java b/okhttp/src/test/java/com/squareup/okhttp/internal/http/URLConnectionTest.java
index d9d3d3d2f..6ed031d54 100644
--- a/okhttp/src/test/java/com/squareup/okhttp/internal/http/URLConnectionTest.java
+++ b/okhttp/src/test/java/com/squareup/okhttp/internal/http/URLConnectionTest.java
@@ -2834,10 +2834,11 @@ public final class URLConnectionTest {
    * -Xbootclasspath/p:/tmp/npn-boot-8.1.2.v20120308.jar}
    */
   private void enableNpn(Protocol protocol) {
-    server.useHttps(sslContext.getSocketFactory(), false);
-    server.setNpnEnabled(true);
     client.setSslSocketFactory(sslContext.getSocketFactory());
     client.setHostnameVerifier(new RecordingHostnameVerifier());
     client.setProtocols(Arrays.asList(protocol, Protocol.HTTP_11));
+    server.useHttps(sslContext.getSocketFactory(), false);
+    server.setNpnEnabled(true);
+    server.setNpnProtocols(client.getProtocols());
   }
 }