@slandelle will you provide a PR ? FYI, it's currently very hard to workaround this issue by subclassing WebSocketClientHandshaker13: `expectedChallengeResponseString` is private, `WebSocketUtil` is package private.

I would love to contribute a fix but I'd like your opinion:

* is this too much of a corner case so we should move WebSocketClientHandshaker13's url computation into a protected method so user can subclass?
* or should we add yet another constructor with a new boolean parameter to all WebSocketClientHandshakerXX classes and another factory method in WebSocketClientHandshakerFactory? @slandelle will it be a problem to always use the absolute url ? @normanmaurer Absolutely, most server implementations will rightfully blow up because of the malformed request. The only case you use absolute urls is with HTTP proxy over clear HTTP. hmm I see... I am not sure what is better (protected vs static method). WDYT ? I'd say to go with the additional parameter/constructors/factory for Netty 4.1.

But this really needs to be cleaned up for Netty 5: drop early specs, make single constructor package protected and introduce a Builder a la `DnsNameResolverBuilder`.

WDYT? @slandelle sounds fine to me... 
we use 4 spaces... can the constructors be package-private for now ? It's very hard to break parameters lists with IntelliJ because it displays parameter names... It would be great to have a maven plugin for formatting the code automatically. @normanmaurer Where can I find the formatting rules? I can find them neither in CONTRIBUTING.MD nor in https://github.com/netty/netty-build/blob/master/src/main/resources/io/netty/checkstyle.xml. odd indent same comment
WebSocketClientHandshaker13 doesn't work with HTTP proxies over clear HTTP
### Expected behavior

When talking with an HTTP proxy over clear HTTP, a user agent should sent requests with an **absolute** url.

### Actual behavior

`WebSocketClientHandshaker13::newHandshakeRequest` generates a request with [relative url](https://github.com/netty/netty/blob/netty-4.1.36.Final/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13.java#L164).

### Steps to reproduce

NA

### Minimal yet complete reproducer code (or URL to code)

NA

### Netty version

4.1.36.Final

### JVM version (e.g. `java -version`)

irrelevant

### OS version (e.g. `uname -a`)

irrelevant

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory.java
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13.java codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory.java
codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00Test.java codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07Test.java codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08Test.java codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13Test.java codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerTest.java
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker.java b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker.java
index 79d499d583e..1ec598bf4a4 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker.java
@@ -75,6 +75,8 @@ public abstract class WebSocketClientHandshaker {
 
     private final int maxFramePayloadLength;
 
+    private final boolean absoluteUpgradeUrl;
+
     /**
      * Base constructor
      *
@@ -115,12 +117,39 @@ protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String su
     protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
                                         HttpHeaders customHeaders, int maxFramePayloadLength,
                                         long forceCloseTimeoutMillis) {
+        this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis, false);
+    }
+
+    /**
+     * Base constructor
+     *
+     * @param uri
+     *            URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
+     *            sent to this URL.
+     * @param version
+     *            Version of web socket specification to use to connect to the server
+     * @param subprotocol
+     *            Sub protocol request sent to the server.
+     * @param customHeaders
+     *            Map of custom headers to add to the client request
+     * @param maxFramePayloadLength
+     *            Maximum length of a frame's payload
+     * @param forceCloseTimeoutMillis
+     *            Close the connection if it was not closed by the server after timeout specified
+     * @param  absoluteUpgradeUrl
+     *            Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
+     *            clear HTTP
+     */
+    protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
+                                        HttpHeaders customHeaders, int maxFramePayloadLength,
+                                        long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl) {
         this.uri = uri;
         this.version = version;
         expectedSubprotocol = subprotocol;
         this.customHeaders = customHeaders;
         this.maxFramePayloadLength = maxFramePayloadLength;
         this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
+        this.absoluteUpgradeUrl = absoluteUpgradeUrl;
     }
 
     /**
@@ -535,7 +564,11 @@ public void operationComplete(ChannelFuture future) throws Exception {
     /**
      * Return the constructed raw path for the give {@link URI}.
      */
-    static String rawPath(URI wsURL) {
+    protected String upgradeUrl(URI wsURL) {
+        if (absoluteUpgradeUrl) {
+            return wsURL.toString();
+        }
+
         String path = wsURL.getRawPath();
         String query = wsURL.getRawQuery();
         if (query != null && !query.isEmpty()) {
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00.java b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00.java
index 3b43bd3ae58..c41ba6f0542 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00.java
@@ -88,7 +88,34 @@ public WebSocketClientHandshaker00(URI webSocketURL, WebSocketVersion version, S
     public WebSocketClientHandshaker00(URI webSocketURL, WebSocketVersion version, String subprotocol,
                                        HttpHeaders customHeaders, int maxFramePayloadLength,
                                        long forceCloseTimeoutMillis) {
-        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis);
+        this(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis, false);
+    }
+
+    /**
+     * Creates a new instance with the specified destination WebSocket location and version to initiate.
+     *
+     * @param webSocketURL
+     *            URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
+     *            sent to this URL.
+     * @param version
+     *            Version of web socket specification to use to connect to the server
+     * @param subprotocol
+     *            Sub protocol request sent to the server.
+     * @param customHeaders
+     *            Map of custom headers to add to the client request
+     * @param maxFramePayloadLength
+     *            Maximum length of a frame's payload
+     * @param forceCloseTimeoutMillis
+     *            Close the connection if it was not closed by the server after timeout specified
+     * @param  absoluteUpgradeUrl
+     *            Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
+     *            clear HTTP
+     */
+    WebSocketClientHandshaker00(URI webSocketURL, WebSocketVersion version, String subprotocol,
+                                HttpHeaders customHeaders, int maxFramePayloadLength,
+                                long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl) {
+        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis,
+                absoluteUpgradeUrl);
     }
 
     /**
@@ -148,12 +175,10 @@ protected FullHttpRequest newHandshakeRequest() {
         System.arraycopy(key3, 0, challenge, 8, 8);
         expectedChallengeResponseBytes = Unpooled.wrappedBuffer(WebSocketUtil.md5(challenge));
 
-        // Get path
         URI wsURL = uri();
-        String path = rawPath(wsURL);
 
         // Format request
-        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, path);
+        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, upgradeUrl(wsURL));
         HttpHeaders headers = request.headers();
 
         if (customHeaders != null) {
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07.java b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07.java
index c10132989f1..b7f55d8dbe7 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07.java
@@ -130,7 +130,45 @@ public WebSocketClientHandshaker07(URI webSocketURL, WebSocketVersion version, S
     public WebSocketClientHandshaker07(URI webSocketURL, WebSocketVersion version, String subprotocol,
             boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength,
             boolean performMasking, boolean allowMaskMismatch, long forceCloseTimeoutMillis) {
-        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis);
+        this(webSocketURL, version, subprotocol, allowExtensions, customHeaders, maxFramePayloadLength, performMasking,
+                allowMaskMismatch, forceCloseTimeoutMillis, false);
+    }
+
+    /**
+     * Creates a new instance.
+     *
+     * @param webSocketURL
+     *            URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
+     *            sent to this URL.
+     * @param version
+     *            Version of web socket specification to use to connect to the server
+     * @param subprotocol
+     *            Sub protocol request sent to the server.
+     * @param allowExtensions
+     *            Allow extensions to be used in the reserved bits of the web socket frame
+     * @param customHeaders
+     *            Map of custom headers to add to the client request
+     * @param maxFramePayloadLength
+     *            Maximum length of a frame's payload
+     * @param performMasking
+     *            Whether to mask all written websocket frames. This must be set to true in order to be fully compatible
+     *            with the websocket specifications. Client applications that communicate with a non-standard server
+     *            which doesn't require masking might set this to false to achieve a higher performance.
+     * @param allowMaskMismatch
+     *            When set to true, frames which are not masked properly according to the standard will still be
+     *            accepted
+     * @param forceCloseTimeoutMillis
+     *            Close the connection if it was not closed by the server after timeout specified.
+     * @param  absoluteUpgradeUrl
+     *            Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
+     *            clear HTTP
+     */
+    WebSocketClientHandshaker07(URI webSocketURL, WebSocketVersion version, String subprotocol,
+                                boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength,
+                                boolean performMasking, boolean allowMaskMismatch, long forceCloseTimeoutMillis,
+                                boolean absoluteUpgradeUrl) {
+        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis,
+                absoluteUpgradeUrl);
         this.allowExtensions = allowExtensions;
         this.performMasking = performMasking;
         this.allowMaskMismatch = allowMaskMismatch;
@@ -156,9 +194,7 @@ public WebSocketClientHandshaker07(URI webSocketURL, WebSocketVersion version, S
      */
     @Override
     protected FullHttpRequest newHandshakeRequest() {
-        // Get path
         URI wsURL = uri();
-        String path = rawPath(wsURL);
 
         // Get 16 bit nonce and base 64 encode it
         byte[] nonce = WebSocketUtil.randomBytes(16);
@@ -175,7 +211,7 @@ protected FullHttpRequest newHandshakeRequest() {
         }
 
         // Format request
-        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, path);
+        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, upgradeUrl(wsURL));
         HttpHeaders headers = request.headers();
 
         if (customHeaders != null) {
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08.java b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08.java
index 237d2f715ed..33f7d2b883d 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08.java
@@ -132,7 +132,45 @@ public WebSocketClientHandshaker08(URI webSocketURL, WebSocketVersion version, S
     public WebSocketClientHandshaker08(URI webSocketURL, WebSocketVersion version, String subprotocol,
             boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength,
             boolean performMasking, boolean allowMaskMismatch, long forceCloseTimeoutMillis) {
-        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis);
+        this(webSocketURL, version, subprotocol, allowExtensions, customHeaders, maxFramePayloadLength, performMasking,
+                allowMaskMismatch, forceCloseTimeoutMillis, false);
+    }
+
+    /**
+     * Creates a new instance.
+     *
+     * @param webSocketURL
+     *            URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
+     *            sent to this URL.
+     * @param version
+     *            Version of web socket specification to use to connect to the server
+     * @param subprotocol
+     *            Sub protocol request sent to the server.
+     * @param allowExtensions
+     *            Allow extensions to be used in the reserved bits of the web socket frame
+     * @param customHeaders
+     *            Map of custom headers to add to the client request
+     * @param maxFramePayloadLength
+     *            Maximum length of a frame's payload
+     * @param performMasking
+     *            Whether to mask all written websocket frames. This must be set to true in order to be fully compatible
+     *            with the websocket specifications. Client applications that communicate with a non-standard server
+     *            which doesn't require masking might set this to false to achieve a higher performance.
+     * @param allowMaskMismatch
+     *            When set to true, frames which are not masked properly according to the standard will still be
+     *            accepted
+     * @param forceCloseTimeoutMillis
+     *            Close the connection if it was not closed by the server after timeout specified.
+     * @param  absoluteUpgradeUrl
+     *            Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
+     *            clear HTTP
+     */
+    WebSocketClientHandshaker08(URI webSocketURL, WebSocketVersion version, String subprotocol,
+                                boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength,
+                                boolean performMasking, boolean allowMaskMismatch, long forceCloseTimeoutMillis,
+                                boolean absoluteUpgradeUrl) {
+        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis,
+                absoluteUpgradeUrl);
         this.allowExtensions = allowExtensions;
         this.performMasking = performMasking;
         this.allowMaskMismatch = allowMaskMismatch;
@@ -158,9 +196,7 @@ public WebSocketClientHandshaker08(URI webSocketURL, WebSocketVersion version, S
      */
     @Override
     protected FullHttpRequest newHandshakeRequest() {
-        // Get path
         URI wsURL = uri();
-        String path = rawPath(wsURL);
 
         // Get 16 bit nonce and base 64 encode it
         byte[] nonce = WebSocketUtil.randomBytes(16);
@@ -177,7 +213,7 @@ protected FullHttpRequest newHandshakeRequest() {
         }
 
         // Format request
-        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, path);
+        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, upgradeUrl(wsURL));
         HttpHeaders headers = request.headers();
 
         if (customHeaders != null) {
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13.java b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13.java
index a96683f2d11..b3cf60432cc 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13.java
@@ -133,7 +133,45 @@ public WebSocketClientHandshaker13(URI webSocketURL, WebSocketVersion version, S
                                        boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength,
                                        boolean performMasking, boolean allowMaskMismatch,
                                        long forceCloseTimeoutMillis) {
-        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis);
+        this(webSocketURL, version, subprotocol, allowExtensions, customHeaders, maxFramePayloadLength, performMasking,
+                allowMaskMismatch, forceCloseTimeoutMillis, false);
+    }
+
+    /**
+     * Creates a new instance.
+     *
+     * @param webSocketURL
+     *            URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
+     *            sent to this URL.
+     * @param version
+     *            Version of web socket specification to use to connect to the server
+     * @param subprotocol
+     *            Sub protocol request sent to the server.
+     * @param allowExtensions
+     *            Allow extensions to be used in the reserved bits of the web socket frame
+     * @param customHeaders
+     *            Map of custom headers to add to the client request
+     * @param maxFramePayloadLength
+     *            Maximum length of a frame's payload
+     * @param performMasking
+     *            Whether to mask all written websocket frames. This must be set to true in order to be fully compatible
+     *            with the websocket specifications. Client applications that communicate with a non-standard server
+     *            which doesn't require masking might set this to false to achieve a higher performance.
+     * @param allowMaskMismatch
+     *            When set to true, frames which are not masked properly according to the standard will still be
+     *            accepted
+     * @param forceCloseTimeoutMillis
+     *            Close the connection if it was not closed by the server after timeout specified.
+     * @param  absoluteUpgradeUrl
+     *            Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
+     *            clear HTTP
+     */
+    WebSocketClientHandshaker13(URI webSocketURL, WebSocketVersion version, String subprotocol,
+                                boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength,
+                                boolean performMasking, boolean allowMaskMismatch,
+                                long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl) {
+        super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis,
+                absoluteUpgradeUrl);
         this.allowExtensions = allowExtensions;
         this.performMasking = performMasking;
         this.allowMaskMismatch = allowMaskMismatch;
@@ -159,9 +197,7 @@ public WebSocketClientHandshaker13(URI webSocketURL, WebSocketVersion version, S
      */
     @Override
     protected FullHttpRequest newHandshakeRequest() {
-        // Get path
         URI wsURL = uri();
-        String path = rawPath(wsURL);
 
         // Get 16 bit nonce and base 64 encode it
         byte[] nonce = WebSocketUtil.randomBytes(16);
@@ -178,7 +214,7 @@ protected FullHttpRequest newHandshakeRequest() {
         }
 
         // Format request
-        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, path);
+        FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, upgradeUrl(wsURL));
         HttpHeaders headers = request.headers();
 
         if (customHeaders != null) {
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory.java b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory.java
index 22afc3bd764..8038920ad84 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory.java
@@ -164,4 +164,62 @@ public static WebSocketClientHandshaker newHandshaker(
 
         throw new WebSocketHandshakeException("Protocol version " + version + " not supported.");
     }
+
+    /**
+     * Creates a new handshaker.
+     *
+     * @param webSocketURL
+     *            URL for web socket communications. e.g "ws://myhost.com/mypath".
+     *            Subsequent web socket frames will be sent to this URL.
+     * @param version
+     *            Version of web socket specification to use to connect to the server
+     * @param subprotocol
+     *            Sub protocol request sent to the server. Null if no sub-protocol support is required.
+     * @param allowExtensions
+     *            Allow extensions to be used in the reserved bits of the web socket frame
+     * @param customHeaders
+     *            Custom HTTP headers to send during the handshake
+     * @param maxFramePayloadLength
+     *            Maximum allowable frame payload length. Setting this value to your application's
+     *            requirement may reduce denial of service attacks using long data frames.
+     * @param performMasking
+     *            Whether to mask all written websocket frames. This must be set to true in order to be fully compatible
+     *            with the websocket specifications. Client applications that communicate with a non-standard server
+     *            which doesn't require masking might set this to false to achieve a higher performance.
+     * @param allowMaskMismatch
+     *            When set to true, frames which are not masked properly according to the standard will still be
+     *            accepted.
+     * @param forceCloseTimeoutMillis
+     *            Close the connection if it was not closed by the server after timeout specified
+     * @param  absoluteUpgradeUrl
+     *            Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
+     *            clear HTTP
+     */
+    public static WebSocketClientHandshaker newHandshaker(
+        URI webSocketURL, WebSocketVersion version, String subprotocol,
+        boolean allowExtensions, HttpHeaders customHeaders, int maxFramePayloadLength,
+        boolean performMasking, boolean allowMaskMismatch, long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl) {
+        if (version == V13) {
+            return new WebSocketClientHandshaker13(
+                webSocketURL, V13, subprotocol, allowExtensions, customHeaders,
+                maxFramePayloadLength, performMasking, allowMaskMismatch, forceCloseTimeoutMillis, absoluteUpgradeUrl);
+        }
+        if (version == V08) {
+            return new WebSocketClientHandshaker08(
+                webSocketURL, V08, subprotocol, allowExtensions, customHeaders,
+                maxFramePayloadLength, performMasking, allowMaskMismatch, forceCloseTimeoutMillis, absoluteUpgradeUrl);
+        }
+        if (version == V07) {
+            return new WebSocketClientHandshaker07(
+                webSocketURL, V07, subprotocol, allowExtensions, customHeaders,
+                maxFramePayloadLength, performMasking, allowMaskMismatch, forceCloseTimeoutMillis, absoluteUpgradeUrl);
+        }
+        if (version == V00) {
+            return new WebSocketClientHandshaker00(
+                webSocketURL, V00, subprotocol, customHeaders,
+                maxFramePayloadLength, forceCloseTimeoutMillis, absoluteUpgradeUrl);
+        }
+
+        throw new WebSocketHandshakeException("Protocol version " + version + " not supported.");
+    }
 }

diff --git a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00Test.java b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00Test.java
index 33c6ce6847e..9b0432a1999 100644
--- a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00Test.java
+++ b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker00Test.java
@@ -22,8 +22,10 @@
 
 public class WebSocketClientHandshaker00Test extends WebSocketClientHandshakerTest {
     @Override
-    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers) {
-        return new WebSocketClientHandshaker00(uri, WebSocketVersion.V00, subprotocol, headers, 1024);
+    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers,
+                                                      boolean absoluteUpgradeUrl) {
+        return new WebSocketClientHandshaker00(uri, WebSocketVersion.V00, subprotocol, headers,
+          1024, 10000, absoluteUpgradeUrl);
     }
 
     @Override
diff --git a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07Test.java b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07Test.java
index 9ff3e8485b9..01acaf92b51 100644
--- a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07Test.java
+++ b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07Test.java
@@ -22,8 +22,11 @@
 
 public class WebSocketClientHandshaker07Test extends WebSocketClientHandshakerTest {
     @Override
-    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers) {
-        return new WebSocketClientHandshaker07(uri, WebSocketVersion.V07, subprotocol, false, headers, 1024);
+    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers,
+                                                      boolean absoluteUpgradeUrl) {
+        return new WebSocketClientHandshaker07(uri, WebSocketVersion.V07, subprotocol, false, headers,
+          1024, true, false, 10000,
+          absoluteUpgradeUrl);
     }
 
     @Override
diff --git a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08Test.java b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08Test.java
index 1efb6821b9b..79c6dd46bfd 100644
--- a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08Test.java
+++ b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker08Test.java
@@ -21,7 +21,10 @@
 
 public class WebSocketClientHandshaker08Test extends WebSocketClientHandshaker07Test {
     @Override
-    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers) {
-        return new WebSocketClientHandshaker08(uri, WebSocketVersion.V08, subprotocol, false, headers, 1024);
+    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers,
+                                                      boolean absoluteUpgradeUrl) {
+        return new WebSocketClientHandshaker08(uri, WebSocketVersion.V08, subprotocol, false, headers,
+          1024, true, true, 10000,
+          absoluteUpgradeUrl);
     }
 }
diff --git a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13Test.java b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13Test.java
index 1727178831d..9a72e2feb1a 100644
--- a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13Test.java
+++ b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker13Test.java
@@ -21,7 +21,10 @@
 
 public class WebSocketClientHandshaker13Test extends WebSocketClientHandshaker07Test {
     @Override
-    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers) {
-        return new WebSocketClientHandshaker13(uri, WebSocketVersion.V13, subprotocol, false, headers, 1024);
+    protected WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers,
+                                                      boolean absoluteUpgradeUrl) {
+        return new WebSocketClientHandshaker13(uri, WebSocketVersion.V13, subprotocol, false, headers,
+          1024, true, true, 10000,
+          absoluteUpgradeUrl);
     }
 }
diff --git a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerTest.java b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerTest.java
index 5cb1e0e7b62..7e09031441d 100644
--- a/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerTest.java
+++ b/codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerTest.java
@@ -40,10 +40,11 @@
 import static org.junit.Assert.*;
 
 public abstract class WebSocketClientHandshakerTest {
-    protected abstract WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers);
+    protected abstract WebSocketClientHandshaker newHandshaker(URI uri, String subprotocol, HttpHeaders headers,
+                                                               boolean absoluteUpgradeUrl);
 
     protected WebSocketClientHandshaker newHandshaker(URI uri) {
-        return newHandshaker(uri, null, null);
+        return newHandshaker(uri, null, null, false);
     }
 
     protected abstract CharSequence getOriginHeaderName();
@@ -180,7 +181,7 @@ protected void testHeaderDefaultHttp(String uri, CharSequence header, String exp
 
     @Test
     @SuppressWarnings("deprecation")
-    public void testRawPath() {
+    public void testUpgradeUrl() {
         URI uri = URI.create("ws://localhost:9999/path%20with%20ws");
         WebSocketClientHandshaker handshaker = newHandshaker(uri);
         FullHttpRequest request = handshaker.newHandshakeRequest();
@@ -192,7 +193,7 @@ public void testRawPath() {
     }
 
     @Test
-    public void testRawPathWithQuery() {
+    public void testUpgradeUrlWithQuery() {
         URI uri = URI.create("ws://localhost:9999/path%20with%20ws?a=b%20c");
         WebSocketClientHandshaker handshaker = newHandshaker(uri);
         FullHttpRequest request = handshaker.newHandshakeRequest();
@@ -203,6 +204,18 @@ public void testRawPathWithQuery() {
         }
     }
 
+    @Test
+    public void testAbsoluteUpgradeUrlWithQuery() {
+        URI uri = URI.create("ws://localhost:9999/path%20with%20ws?a=b%20c");
+        WebSocketClientHandshaker handshaker = newHandshaker(uri, null, null, true);
+        FullHttpRequest request = handshaker.newHandshakeRequest();
+        try {
+            assertEquals("ws://localhost:9999/path%20with%20ws?a=b%20c", request.uri());
+        } finally {
+            request.release();
+        }
+    }
+
     @Test(timeout = 3000)
     public void testHttpResponseAndFrameInSameBuffer() {
         testHttpResponseAndFrameInSameBuffer(false);
@@ -317,7 +330,7 @@ public void testDuplicateWebsocketHandshakeHeaders() {
         inputHeaders.add(getProtocolHeaderName(), bogusSubProtocol);
 
         String realSubProtocol = "realSubProtocol";
-        WebSocketClientHandshaker handshaker = newHandshaker(uri, realSubProtocol, inputHeaders);
+        WebSocketClientHandshaker handshaker = newHandshaker(uri, realSubProtocol, inputHeaders, false);
         FullHttpRequest request = handshaker.newHandshakeRequest();
         HttpHeaders outputHeaders = request.headers();
 
