@@ -906,13 +906,13 @@ private void verifyServerHandshake(InputStream inputStream, String secWebSocketK
906906 for (String s : lines ) {
907907 String [] parts = s .split (":" , 2 );
908908 if (parts .length == 2 ) {
909- headers .put (parts [0 ].trim (), parts [1 ].trim ());
909+ headers .put (parts [0 ].trim (). toLowerCase () , parts [1 ].trim ());
910910 } else {
911911 throw new InvalidServerHandshakeException ("Invalid headers format" );
912912 }
913913 }
914914
915- String upgradeValue = headers .get ("Upgrade " );
915+ String upgradeValue = headers .get ("upgrade " );
916916 if (upgradeValue == null ) {
917917 throw new InvalidServerHandshakeException ("There is no header named Upgrade" );
918918 }
@@ -921,7 +921,7 @@ private void verifyServerHandshake(InputStream inputStream, String secWebSocketK
921921 throw new InvalidServerHandshakeException ("Invalid value for header Upgrade. Expected: websocket, received: " + upgradeValue );
922922 }
923923
924- String connectionValue = headers .get ("Connection " );
924+ String connectionValue = headers .get ("connection " );
925925 if (connectionValue == null ) {
926926 throw new InvalidServerHandshakeException ("There is no header named Connection" );
927927 }
@@ -930,7 +930,7 @@ private void verifyServerHandshake(InputStream inputStream, String secWebSocketK
930930 throw new InvalidServerHandshakeException ("Invalid value for header Connection. Expected: upgrade, received: " + connectionValue );
931931 }
932932
933- String secWebSocketAcceptValue = headers .get ("Sec-WebSocket-Accept " );
933+ String secWebSocketAcceptValue = headers .get ("sec-websocket-accept " );
934934 if (secWebSocketAcceptValue == null ) {
935935 throw new InvalidServerHandshakeException ("There is no header named Sec-WebSocket-Accept" );
936936 }
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