[netty#2939] Fix SslContext usage in the examples for client side

Motivation:

We incorrectly used SslContext.newServerContext() in some places where a we needed a client context.

Modifications:

Use SslContext.newClientContext() when using ssl on the client side.

Result:

Working ssl client examples.

Author: normanmaurer

example/src/main/java/io/netty/example/http/upload/HttpUploadClient.java

@@ -36,7 +36,7 @@
 import io.netty.handler.codec.http.multipart.HttpPostRequestEncoder;
 import io.netty.handler.codec.http.multipart.InterfaceHttpData;
 import io.netty.handler.ssl.SslContext;
-import io.netty.handler.ssl.util.SelfSignedCertificate;
+import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -85,8 +85,7 @@ public static void main(String[] args) throws Exception {
         final boolean ssl = "https".equalsIgnoreCase(scheme);
         final SslContext sslCtx;
         if (ssl) {
-            SelfSignedCertificate ssc = new SelfSignedCertificate();
-            sslCtx = SslContext.newServerContext(ssc.certificate(), ssc.privateKey());
+            sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);
         } else {
             sslCtx = null;
         }

example/src/main/java/io/netty/example/http/websocketx/client/WebSocketClient.java

@@ -35,6 +35,7 @@
 import io.netty.handler.codec.http.websocketx.WebSocketVersion;
 import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler;
 import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
 import io.netty.handler.ssl.util.SelfSignedCertificate;
 
 import java.io.BufferedReader;
@@ -83,8 +84,7 @@ public static void main(String[] args) throws Exception {
         final boolean ssl = "wss".equalsIgnoreCase(scheme);
         final SslContext sslCtx;
         if (ssl) {
-            SelfSignedCertificate ssc = new SelfSignedCertificate();
-            sslCtx = SslContext.newServerContext(ssc.certificate(), ssc.privateKey());
+            sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);
         } else {
             sslCtx = null;
         }