steveloughran commented on code in PR #7884:
URL: https://github.com/apache/hadoop/pull/7884#discussion_r2284687794


##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/SimpleHttpProxyHandler.java:
##########
@@ -107,7 +132,16 @@ public void exceptionCaught(ChannelHandlerContext ctx, 
Throwable cause) {
         @Override
         protected void initChannel(SocketChannel ch) throws Exception {
           ChannelPipeline p = ch.pipeline();
-          p.addLast(new HttpRequestEncoder(), new Forwarder(uri, client));
+          p.addLast(new HttpRequestEncoder());
+          if (isSecure) {
+            // Decode the proxy response and - if it's a redirect - rewrite the

Review Comment:
   log here



##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/SimpleHttpProxyHandler.java:
##########
@@ -95,6 +99,27 @@ public void exceptionCaught(ChannelHandlerContext ctx, 
Throwable cause) {
     }
   }
 
+  private static class SslRedirectRewriter extends 
ChannelInboundHandlerAdapter {
+    private SslRedirectRewriter() { }
+
+    @Override
+    public void channelRead(final ChannelHandlerContext ctx, Object msg) {

Review Comment:
   go on, add some vowels. 



##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/SimpleHttpProxyHandler.java:
##########
@@ -95,6 +99,27 @@ public void exceptionCaught(ChannelHandlerContext ctx, 
Throwable cause) {
     }
   }
 
+  private static class SslRedirectRewriter extends 
ChannelInboundHandlerAdapter {

Review Comment:
   javadocs, less about what happens but 
   * why this is needed at all -and include the jira ID. 
   * how this fits into the process. Specifically, it's processing the response 
so must happen in the response phase.
   
   + make final. 



##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/SimpleHttpProxyHandler.java:
##########
@@ -95,6 +99,27 @@ public void exceptionCaught(ChannelHandlerContext ctx, 
Throwable cause) {
     }
   }
 
+  private static class SslRedirectRewriter extends 
ChannelInboundHandlerAdapter {
+    private SslRedirectRewriter() { }
+
+    @Override
+    public void channelRead(final ChannelHandlerContext ctx, Object msg) {
+      if (!(msg instanceof HttpResponse)) {
+        ctx.fireChannelRead(msg);
+        return;
+      }
+
+      HttpResponse resp = (HttpResponse) msg;
+      String location = resp.headers().get("Location");

Review Comment:
   use the constant in io.netty.handler.codec.http.HttpHeaderNames



##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/SimpleHttpProxyHandler.java:
##########
@@ -95,6 +99,27 @@ public void exceptionCaught(ChannelHandlerContext ctx, 
Throwable cause) {
     }
   }
 
+  private static class SslRedirectRewriter extends 
ChannelInboundHandlerAdapter {
+    private SslRedirectRewriter() { }
+
+    @Override
+    public void channelRead(final ChannelHandlerContext ctx, Object msg) {
+      if (!(msg instanceof HttpResponse)) {
+        ctx.fireChannelRead(msg);
+        return;
+      }
+
+      HttpResponse resp = (HttpResponse) msg;

Review Comment:
   again, it's OK to have longer variables



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