[websocket] Fix getStreamFromOpenElement()

smack-websocket/src/main/java/org/jivesoftware/smack/websocket/impl/AbstractWebSocket.java

@@ -93,9 +93,9 @@ public abstract class AbstractWebSocket {
     }
 
     static String getStreamFromOpenElement(String openElement) {
-        String streamElement = openElement.replaceFirst("\\A<open ", "<stream ")
+        String streamElement = openElement.replaceFirst("\\A<open ", "<stream:stream ")
                                           .replace("urn:ietf:params:xml:ns:xmpp-framing", "jabber:client")
-                                          .replaceFirst("/>\\s*\\z", ">");
+                                          .replaceFirst("/>\\s*\\z", " xmlns:stream='http://etherx.jabber.org/streams'>");
         return streamElement;
     }
 

smack-websocket/src/test/java/org/jivesoftware/smack/websocket/impl/AbstractWebSocketTest.java

@@ -24,7 +24,7 @@ import org.junit.jupiter.api.Test;
 
 public final class AbstractWebSocketTest {
     private static final String OPEN_ELEMENT = "<open from='localhost.org' id='aov9ihhmmn' xmlns='urn:ietf:params:xml:ns:xmpp-framing' xml:lang='en' version='1.0'/>";
-    private static final String OPEN_STREAM = "<stream from='localhost.org' id='aov9ihhmmn' xmlns='jabber:client' xml:lang='en' version='1.0'>";
+    private static final String OPEN_STREAM = "<stream:stream from='localhost.org' id='aov9ihhmmn' xmlns='jabber:client' xml:lang='en' version='1.0' xmlns:stream='http://etherx.jabber.org/streams'>";
     private static final String CLOSE_ELEMENT = "<close xmlns='urn:ietf:params:xml:ns:xmpp-framing'/>";
 
     @Test