Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/3460#discussion_r105904946
--- Diff:
flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/files/AbstractStaticFileServerHandler.java
---
@@ -0,0 +1,372 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.flink.runtime.webmonitor.files;
+
+/*****************************************************************************
+ * This code is based on the "HttpStaticFileServerHandler" from the
+ * Netty project's HTTP server example.
+ *
+ * See http://netty.io and
+ *
https://github.com/netty/netty/blob/4.0/example/src/main/java/io/netty/example/http/file/HttpStaticFileServerHandler.java
+
*****************************************************************************/
+
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.DefaultFileRegion;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.handler.codec.http.DefaultFullHttpResponse;
+import io.netty.handler.codec.http.DefaultHttpResponse;
+import io.netty.handler.codec.http.FullHttpResponse;
+import io.netty.handler.codec.http.HttpChunkedInput;
+import io.netty.handler.codec.http.HttpHeaders;
+import io.netty.handler.codec.http.HttpRequest;
+import io.netty.handler.codec.http.HttpResponse;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.LastHttpContent;
+import io.netty.handler.codec.http.router.Routed;
+import io.netty.handler.ssl.SslHandler;
+import io.netty.handler.stream.ChunkedFile;
+import io.netty.util.CharsetUtil;
+import org.apache.flink.util.Preconditions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.RandomAccessFile;
+import java.net.URI;
+import java.net.URL;
+import java.nio.file.Files;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+import java.util.Locale;
+import java.util.TimeZone;
+
+import static io.netty.handler.codec.http.HttpHeaders.Names.CACHE_CONTROL;
+import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
+import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
+import static io.netty.handler.codec.http.HttpHeaders.Names.DATE;
+import static io.netty.handler.codec.http.HttpHeaders.Names.EXPIRES;
+import static
io.netty.handler.codec.http.HttpHeaders.Names.IF_MODIFIED_SINCE;
+import static io.netty.handler.codec.http.HttpHeaders.Names.LAST_MODIFIED;
+import static
io.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR;
+import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
+import static io.netty.handler.codec.http.HttpResponseStatus.NOT_MODIFIED;
+import static io.netty.handler.codec.http.HttpResponseStatus.OK;
+import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
+
+/**
+ * Simple file server handler that serves requests to web frontend's
static files, such as
+ * HTML, CSS, or JS files.
+ *
+ * This code is based on the "HttpStaticFileServerHandler" from the Netty
project's HTTP server
+ * example.
+ *
+ * For every incoming requests the {@link Routed#path()} is pre-processed
in
+ * {@link AbstractStaticFileServerHandler#preProcessRequestPath(String)}.
+ *
+ * This path is then interpreted as a relative file path, with the
configured rootDir being the parent.
+ *
+ * If no file exists for this path, another (optional) pre-processing step
is executed in
+ * {@link AbstractStaticFileServerHandler#preProcessFilePath(String)}.
+ * We then try to load a file for the resulting file path using the {@link
ClassLoader}.
+ */
+public abstract class AbstractStaticFileServerHandler extends
SimpleChannelInboundHandler<Routed> {
--- End diff --
Something subtle must have changed here calling
`http://localhost:8081/index.html` works but `http://localhost:8081` does not.
Please add a specific test after fixing.
I get the following Exception:
```
2017-03-14 14:21:24,635 ERROR
org.apache.flink.runtime.webmonitor.files.StaticFileServerHandler - error
while responding
java.nio.file.FileAlreadyExistsException:
/private/var/folders/py/s_1l8vln6f19ygc77m8c4zhr0000gn/T/flink-web-13c5ce04-53d8-4a50-9f67-5b126f02a81e
at
sun.nio.fs.UnixException.translateToIOException(UnixException.java:88)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at
sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
at
java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:434)
at java.nio.file.Files.newOutputStream(Files.java:216)
at java.nio.file.Files.copy(Files.java:3016)
at
org.apache.flink.runtime.webmonitor.files.AbstractStaticFileServerHandler.respondWithFile(AbstractStaticFileServerHandler.java:157)
at
org.apache.flink.runtime.webmonitor.files.StaticFileServerHandler.handleRequest(StaticFileServerHandler.java:102)
at
org.apache.flink.runtime.webmonitor.files.AbstractStaticFileServerHandler.channelRead0(AbstractStaticFileServerHandler.java:123)
at
org.apache.flink.runtime.webmonitor.files.AbstractStaticFileServerHandler.channelRead0(AbstractStaticFileServerHandler.java:96)
at
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at io.netty.handler.codec.http.router.Handler.routed(Handler.java:62)
at
io.netty.handler.codec.http.router.DualAbstractHandler.channelRead0(DualAbstractHandler.java:57)
at
io.netty.handler.codec.http.router.DualAbstractHandler.channelRead0(DualAbstractHandler.java:20)
at
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at
org.apache.flink.runtime.webmonitor.HttpRequestHandler.channelRead0(HttpRequestHandler.java:105)
at
org.apache.flink.runtime.webmonitor.HttpRequestHandler.channelRead0(HttpRequestHandler.java:65)
at
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at
io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
at
io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:147)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
at
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
at java.lang.Thread.run(Thread.java:745)
```
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