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diff --git a/src/java/javax/websocket/server/ServerEndpointConfig.java b/src/java/javax/websocket/server/ServerEndpointConfig.java
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+++ b/src/java/javax/websocket/server/ServerEndpointConfig.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package javax.websocket.server;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ServiceLoader;
+
+import javax.websocket.Decoder;
+import javax.websocket.Encoder;
+import javax.websocket.EndpointConfig;
+import javax.websocket.Extension;
+import javax.websocket.HandshakeResponse;
+
+/**
+ * Provides configuration information for WebSocket endpoints published to a
+ * server. Applications may provide their own implementation or use
+ * {@link Builder}.
+ */
+public interface ServerEndpointConfig extends EndpointConfig {
+
+    Class<?> getEndpointClass();
+
+    /**
+     * Returns the path at which this WebSocket server endpoint has been
+     * registered. It may be a path or a level 0 URI template.
+     * @return The registered path
+     */
+    String getPath();
+
+    List<String> getSubprotocols();
+
+    List<Extension> getExtensions();
+
+    Configurator getConfigurator();
+
+
+    public final class Builder {
+
+        public static Builder create(
+                Class<?> endpointClass, String path) {
+            return new Builder(endpointClass, path);
+        }
+
+
+        private final Class<?> endpointClass;
+        private final String path;
+        private List<Class<? extends Encoder>> encoders =
+                Collections.emptyList();
+        private List<Class<? extends Decoder>> decoders =
+                Collections.emptyList();
+        private List<String> subprotocols = Collections.emptyList();
+        private List<Extension> extensions = Collections.emptyList();
+        private Configurator configurator =
+                Configurator.fetchContainerDefaultConfigurator();
+
+
+        private Builder(Class<?> endpointClass,
+                String path) {
+            this.endpointClass = endpointClass;
+            this.path = path;
+        }
+
+        public ServerEndpointConfig build() {
+            return new DefaultServerEndpointConfig(endpointClass, path,
+                    subprotocols, extensions, encoders, decoders, configurator);
+        }
+
+
+        public Builder encoders(
+                List<Class<? extends Encoder>> encoders) {
+            if (encoders == null || encoders.size() == 0) {
+                this.encoders = Collections.emptyList();
+            } else {
+                this.encoders = Collections.unmodifiableList(encoders);
+            }
+            return this;
+        }
+
+
+        public Builder decoders(
+                List<Class<? extends Decoder>> decoders) {
+            if (decoders == null || decoders.size() == 0) {
+                this.decoders = Collections.emptyList();
+            } else {
+                this.decoders = Collections.unmodifiableList(decoders);
+            }
+            return this;
+        }
+
+
+        public Builder subprotocols(
+                List<String> subprotocols) {
+            if (subprotocols == null || subprotocols.size() == 0) {
+                this.subprotocols = Collections.emptyList();
+            } else {
+                this.subprotocols = Collections.unmodifiableList(subprotocols);
+            }
+            return this;
+        }
+
+
+        public Builder extensions(
+                List<Extension> extensions) {
+            if (extensions == null || extensions.size() == 0) {
+                this.extensions = Collections.emptyList();
+            } else {
+                this.extensions = Collections.unmodifiableList(extensions);
+            }
+            return this;
+        }
+
+
+        public Builder configurator(Configurator serverEndpointConfigurator) {
+            if (serverEndpointConfigurator == null) {
+                this.configurator = Configurator.fetchContainerDefaultConfigurator();
+            } else {
+                this.configurator = serverEndpointConfigurator;
+            }
+            return this;
+        }
+    }
+
+
+    public class Configurator {
+
+        private static volatile Configurator defaultImpl = null;
+        private static final Object defaultImplLock = new Object();
+
+        private static final String DEFAULT_IMPL_CLASSNAME =
+                "nginx.unit.websocket.server.DefaultServerEndpointConfigurator";
+
+        public static void setDefault(Configurator def) {
+            synchronized (defaultImplLock) {
+                defaultImpl = def;
+            }
+        }
+
+        static Configurator fetchContainerDefaultConfigurator() {
+            if (defaultImpl == null) {
+                synchronized (defaultImplLock) {
+                    if (defaultImpl == null) {
+                        defaultImpl = loadDefault();
+                    }
+                }
+            }
+            return defaultImpl;
+        }
+
+
+        private static Configurator loadDefault() {
+            Configurator result = null;
+
+            ServiceLoader<Configurator> serviceLoader =
+                    ServiceLoader.load(Configurator.class);
+
+            Iterator<Configurator> iter = serviceLoader.iterator();
+            while (result == null && iter.hasNext()) {
+                result = iter.next();
+            }
+
+            // Fall-back. Also used by unit tests
+            if (result == null) {
+                try {
+                    @SuppressWarnings("unchecked")
+                    Class<Configurator> clazz =
+                            (Class<Configurator>) Class.forName(
+                                    DEFAULT_IMPL_CLASSNAME);
+                    result = clazz.getConstructor().newInstance();
+                } catch (ReflectiveOperationException | IllegalArgumentException |
+                        SecurityException e) {
+                    // No options left. Just return null.
+                }
+            }
+            return result;
+        }
+
+        public String getNegotiatedSubprotocol(List<String> supported,
+                List<String> requested) {
+            return fetchContainerDefaultConfigurator().getNegotiatedSubprotocol(supported, requested);
+        }
+
+        public List<Extension> getNegotiatedExtensions(List<Extension> installed,
+                List<Extension> requested) {
+            return fetchContainerDefaultConfigurator().getNegotiatedExtensions(installed, requested);
+        }
+
+        public boolean checkOrigin(String originHeaderValue) {
+            return fetchContainerDefaultConfigurator().checkOrigin(originHeaderValue);
+        }
+
+        public void modifyHandshake(ServerEndpointConfig sec,
+                HandshakeRequest request, HandshakeResponse response) {
+            fetchContainerDefaultConfigurator().modifyHandshake(sec, request, response);
+        }
+
+        public <T extends Object> T getEndpointInstance(Class<T> clazz)
+                throws InstantiationException {
+            return fetchContainerDefaultConfigurator().getEndpointInstance(
+                    clazz);
+        }
+    }
+}