8217264: HttpClient: Blocking operations in mapper function do not work as documented

Ensures that a new task is spawned when calling getBody() on a mapping BodySubscriber.

Reviewed-by: chegar

src/java.net.http/share/classes/jdk/internal/net/http/BufferingSubscriber.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -37,14 +37,14 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import java.net.http.HttpResponse.BodySubscriber;
 import jdk.internal.net.http.common.Demand;
 import jdk.internal.net.http.common.SequentialScheduler;
-import jdk.internal.net.http.common.Utils;
+import jdk.internal.net.http.ResponseSubscribers.TrustedSubscriber;
 
 /**
  * A buffering BodySubscriber. When subscribed, accumulates ( buffers ) a given
  * amount ( in bytes ) of a publisher's data before pushing it to a downstream
  * subscriber.
  */
-public class BufferingSubscriber<T> implements BodySubscriber<T>
+public class BufferingSubscriber<T> implements TrustedSubscriber<T>
 {
     /** The downstream consumer of the data. */
     private final BodySubscriber<T> downstreamSubscriber;
@@ -94,6 +94,11 @@ public class BufferingSubscriber<T> implements BodySubscriber<T>
         return buffers.stream().mapToLong(ByteBuffer::remaining).sum();
     }
 
+    @Override
+    public boolean needsExecutor() {
+        return TrustedSubscriber.needsExecutor(downstreamSubscriber);
+    }
+
     /**
      * Tells whether, or not, there is at least a sufficient number of bytes
      * accumulated in the internal buffers. If the subscriber is COMPLETE, and

src/java.net.http/share/classes/jdk/internal/net/http/Http1AsyncReceiver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -34,6 +34,7 @@ import java.util.List;
 import java.util.Set;
 import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.Executor;
+import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Flow;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicLong;
@@ -199,7 +200,11 @@ class Http1AsyncReceiver {
     private void flush() {
         ByteBuffer buf;
         try {
-            assert !client.isSelectorThread() :
+            // we should not be running in the selector here,
+            // except if the custom Executor supplied to the client is
+            // something like (r) -> r.run();
+           assert !client.isSelectorThread()
+                   || !(client.theExecutor().delegate() instanceof ExecutorService) :
                     "Http1AsyncReceiver::flush should not run in the selector: "
                     + Thread.currentThread().getName();
 

src/java.net.http/share/classes/jdk/internal/net/http/Http1Response.java

@@ -41,6 +41,7 @@ import java.net.http.HttpHeaders;
 import java.net.http.HttpResponse;
 import jdk.internal.net.http.ResponseContent.BodyParser;
 import jdk.internal.net.http.ResponseContent.UnknownLengthBodyParser;
+import jdk.internal.net.http.ResponseSubscribers.TrustedSubscriber;
 import jdk.internal.net.http.common.Log;
 import jdk.internal.net.http.common.Logger;
 import jdk.internal.net.http.common.MinimalFuture;
@@ -293,7 +294,7 @@ class Http1Response<T> {
      * subscribed.
      * @param <U> The type of response.
      */
-    final static class Http1BodySubscriber<U> implements HttpResponse.BodySubscriber<U> {
+    final static class Http1BodySubscriber<U> implements TrustedSubscriber<U> {
         final HttpResponse.BodySubscriber<U> userSubscriber;
         final AtomicBoolean completed = new AtomicBoolean();
         volatile Throwable withError;
@@ -302,6 +303,11 @@ class Http1Response<T> {
             this.userSubscriber = userSubscriber;
         }
 
+        @Override
+        public boolean needsExecutor() {
+            return TrustedSubscriber.needsExecutor(userSubscriber);
+        }
+
         // propagate the error to the user subscriber, even if not
         // subscribed yet.
         private void propagateError(Throwable t) {
@@ -356,6 +362,7 @@ class Http1Response<T> {
         public CompletionStage<U> getBody() {
             return userSubscriber.getBody();
         }
+
         @Override
         public void onSubscribe(Flow.Subscription subscription) {
             if (!subscribed) {
@@ -475,18 +482,12 @@ class Http1Response<T> {
                 connection.client().unreference();
             }
         });
-        try {
+
-            p.getBody().whenComplete((U u, Throwable t) -> {
+        ResponseSubscribers.getBodyAsync(executor, p, cf, (t) -> {
-                if (t == null)
-                    cf.complete(u);
-                else
-                    cf.completeExceptionally(t);
-            });
-        } catch (Throwable t) {
             cf.completeExceptionally(t);
             asyncReceiver.setRetryOnError(false);
             asyncReceiver.onReadError(t);
-        }
+        });
 
         return cf.whenComplete((s,t) -> {
             if (t != null) {

src/java.net.http/share/classes/jdk/internal/net/http/MultiExchange.java

@@ -271,9 +271,9 @@ class MultiExchange<T> {
     private CompletableFuture<HttpResponse<T>> handleNoBody(Response r, Exchange<T> exch) {
         BodySubscriber<T> bs = responseHandler.apply(new ResponseInfoImpl(r.statusCode(),
                 r.headers(), r.version()));
-        CompletionStage<T> cs = bs.getBody();
         bs.onSubscribe(new NullSubscription());
         bs.onComplete();
+        CompletionStage<T> cs = ResponseSubscribers.getBodyAsync(executor, bs);
         MinimalFuture<HttpResponse<T>> result = new MinimalFuture<>();
         cs.whenComplete((nullBody, exception) -> {
             if (exception != null)

src/java.net.http/share/classes/jdk/internal/net/http/ResponseSubscribers.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,9 +30,6 @@ import java.io.FilePermission;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
-import java.lang.System.Logger.Level;
-import java.net.http.HttpHeaders;
-import java.net.http.HttpResponse;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.nio.charset.Charset;
@@ -50,6 +47,7 @@ import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Executor;
 import java.util.concurrent.Flow;
 import java.util.concurrent.Flow.Subscriber;
 import java.util.concurrent.Flow.Subscription;
@@ -67,7 +65,50 @@ import static java.nio.charset.StandardCharsets.UTF_8;
 
 public class ResponseSubscribers {
 
-    public static class ConsumerSubscriber implements BodySubscriber<Void> {
+    /**
+     * This interface is used by our BodySubscriber implementations to
+     * declare whether calling getBody() inline is safe, or whether
+     * it needs to be called asynchronously in an executor thread.
+     * Calling getBody() inline is usually safe except when it
+     * might block - which can be the case if the BodySubscriber
+     * is provided by custom code, or if it uses a finisher that
+     * might be called and might block before the last bit is
+     * received (for instance, if a mapping subscriber is used with
+     * a mapper function that maps an InputStream to a GZIPInputStream,
+     * as the the constructor of GZIPInputStream calls read()).
+     * @param <T> The response type.
+     */
+    public interface TrustedSubscriber<T> extends BodySubscriber<T> {
+        /**
+         * Returns true if getBody() should be called asynchronously.
+         * @implSpec The default implementation of this method returns
+         *           false.
+         * @return true if getBody() should be called asynchronously.
+         */
+        default boolean needsExecutor() { return false;}
+
+        /**
+         * Returns true if calling {@code bs::getBody} might block
+         * and requires an executor.
+         *
+         * @implNote
+         * In particular this method returns
+         * true if {@code bs} is not a {@code TrustedSubscriber}.
+         * If it is a {@code TrustedSubscriber}, it returns
+         * {@code ((TrustedSubscriber) bs).needsExecutor()}.
+         *
+         * @param bs A BodySubscriber.
+         * @return true if calling {@code bs::getBody} requires using
+         *         an executor.
+         */
+        static boolean needsExecutor(BodySubscriber<?> bs) {
+            if (bs instanceof TrustedSubscriber) {
+                return ((TrustedSubscriber) bs).needsExecutor();
+            } else return true;
+        }
+    }
+
+    public static class ConsumerSubscriber implements TrustedSubscriber<Void> {
         private final Consumer<Optional<byte[]>> consumer;
         private Flow.Subscription subscription;
         private final CompletableFuture<Void> result = new MinimalFuture<>();
@@ -122,7 +163,7 @@ public class ResponseSubscribers {
      * asserts the specific, write, file permissions that were checked during
      * the construction of this PathSubscriber.
      */
-    public static class PathSubscriber implements BodySubscriber<Path> {
+    public static class PathSubscriber implements TrustedSubscriber<Path> {
 
         private static final FilePermission[] EMPTY_FILE_PERMISSIONS = new FilePermission[0];
 
@@ -223,7 +264,7 @@ public class ResponseSubscribers {
         }
     }
 
-    public static class ByteArraySubscriber<T> implements BodySubscriber<T> {
+    public static class ByteArraySubscriber<T> implements TrustedSubscriber<T> {
         private final Function<byte[], T> finisher;
         private final CompletableFuture<T> result = new MinimalFuture<>();
         private final List<ByteBuffer> received = new ArrayList<>();
@@ -292,7 +333,7 @@ public class ResponseSubscribers {
      * An InputStream built on top of the Flow API.
      */
     public static class HttpResponseInputStream extends InputStream
-        implements BodySubscriber<InputStream>
+        implements TrustedSubscriber<InputStream>
     {
         final static int MAX_BUFFERS_IN_QUEUE = 1;  // lock-step with the producer
 
@@ -409,6 +450,24 @@ public class ResponseSubscribers {
             return buffer.get() & 0xFF;
         }
 
+        @Override
+        public int available() throws IOException {
+            // best effort: returns the number of remaining bytes in
+            // the current buffer if any, or 1 if the current buffer
+            // is null or empty but the queue or current buffer list
+            // are not empty. Returns 0 otherwise.
+            if (closed) return 0;
+            int available = 0;
+            ByteBuffer current = currentBuffer;
+            if (current == LAST_BUFFER) return 0;
+            if (current != null) available = current.remaining();
+            if (available != 0) return available;
+            Iterator<?> iterator = currentListItr;
+            if (iterator != null && iterator.hasNext()) return 1;
+            if (buffers.isEmpty()) return 0;
+            return 1;
+        }
+
         @Override
         public void onSubscribe(Flow.Subscription s) {
             try {
@@ -517,17 +576,19 @@ public class ResponseSubscribers {
     public static BodySubscriber<Stream<String>> createLineStream(Charset charset) {
         Objects.requireNonNull(charset);
         BodySubscriber<InputStream> s = new HttpResponseInputStream();
+        // Creates a MappingSubscriber with a trusted finisher that is
+        // trusted not to block.
         return new MappingSubscriber<InputStream,Stream<String>>(s,
             (InputStream stream) -> {
                 return new BufferedReader(new InputStreamReader(stream, charset))
                             .lines().onClose(() -> Utils.close(stream));
-            });
+            }, true);
     }
 
     /**
      * Currently this consumes all of the data and ignores it
      */
-    public static class NullSubscriber<T> implements BodySubscriber<T> {
+    public static class NullSubscriber<T> implements TrustedSubscriber<T> {
 
         private final CompletableFuture<T> cf = new MinimalFuture<>();
         private final Optional<T> result;
@@ -573,13 +634,16 @@ public class ResponseSubscribers {
 
     /** An adapter between {@code BodySubscriber} and {@code Flow.Subscriber}. */
     public static final class SubscriberAdapter<S extends Subscriber<? super List<ByteBuffer>>,R>
-        implements BodySubscriber<R>
+        implements TrustedSubscriber<R>
     {
         private final CompletableFuture<R> cf = new MinimalFuture<>();
         private final S subscriber;
         private final Function<? super S,? extends R> finisher;
         private volatile Subscription subscription;
 
+        // The finisher isn't called until all bytes have been received,
+        // and so shouldn't need an executor. No need to override
+        // TrustedSubscriber::needsExecutor
         public SubscriberAdapter(S subscriber, Function<? super S,? extends R> finisher) {
             this.subscriber = Objects.requireNonNull(subscriber);
             this.finisher = Objects.requireNonNull(finisher);
@@ -647,16 +711,40 @@ public class ResponseSubscribers {
      * @param <T> the upstream body type
      * @param <U> this subscriber's body type
      */
-    public static class MappingSubscriber<T,U> implements BodySubscriber<U> {
+    public static class MappingSubscriber<T,U> implements TrustedSubscriber<U> {
         private final BodySubscriber<T> upstream;
         private final Function<? super T,? extends U> mapper;
+        private final boolean trusted;
 
         public MappingSubscriber(BodySubscriber<T> upstream,
                                  Function<? super T,? extends U> mapper) {
-            this.upstream = Objects.requireNonNull(upstream);
+            this(upstream, mapper, false);
-            this.mapper = Objects.requireNonNull(mapper);
         }
 
+        // creates a MappingSubscriber with a mapper that is trusted
+        // to not block when called.
+        MappingSubscriber(BodySubscriber<T> upstream,
+                          Function<? super T,? extends U> mapper,
+                          boolean trusted) {
+            this.upstream = Objects.requireNonNull(upstream);
+            this.mapper = Objects.requireNonNull(mapper);
+            this.trusted = trusted;
+        }
+
+        // There is no way to know whether a custom mapper function
+        // might block or not - so we should return true unless the
+        // mapper is implemented and trusted by our own code not to
+        // block.
+        @Override
+        public boolean needsExecutor() {
+            return !trusted || TrustedSubscriber.needsExecutor(upstream);
+        }
+
+        // If upstream.getBody() is already completed (case of InputStream),
+        // then calling upstream.getBody().thenApply(mapper) might block
+        // if the mapper blocks. We should probably add a variant of
+        // MappingSubscriber that calls thenApplyAsync instead, but this
+        // needs a new public API point. See needsExecutor() above.
         @Override
         public CompletionStage<U> getBody() {
             return upstream.getBody().thenApply(mapper);
@@ -685,7 +773,7 @@ public class ResponseSubscribers {
 
     // A BodySubscriber that returns a Publisher<List<ByteBuffer>>
     static class PublishingBodySubscriber
-            implements BodySubscriber<Flow.Publisher<List<ByteBuffer>>> {
+            implements TrustedSubscriber<Flow.Publisher<List<ByteBuffer>>> {
         private final MinimalFuture<Flow.Subscription>
                 subscriptionCF = new MinimalFuture<>();
         private final MinimalFuture<SubscriberRef>
@@ -894,4 +982,110 @@ public class ResponseSubscribers {
         return new PublishingBodySubscriber();
     }
 
+
+    /**
+     * Tries to determine whether bs::getBody must be invoked asynchronously,
+     * and if so, uses the provided executor to do it.
+     * If the executor is a {@link HttpClientImpl.DelegatingExecutor},
+     * uses the executor's delegate.
+     * @param e    The executor to use if an executor is required.
+     * @param bs   The BodySubscriber (trusted or not)
+     * @param <T>  The type of the response.
+     * @return A completion stage that completes when the completion
+     *         stage returned by bs::getBody completes. This may, or
+     *         may not, be the same completion stage.
+     */
+    public static <T> CompletionStage<T> getBodyAsync(Executor e, BodySubscriber<T> bs) {
+        if (TrustedSubscriber.needsExecutor(bs)) {
+            // getBody must be called in the executor
+            return getBodyAsync(e, bs, new MinimalFuture<>());
+        } else {
+            // No executor needed
+            return bs.getBody();
+        }
+    }
+
+    /**
+     * Invokes bs::getBody using the provided executor.
+     * If invoking bs::getBody requires an executor, and the given executor
+     * is a {@link HttpClientImpl.DelegatingExecutor}, then the executor's
+     * delegate is used. If an error occurs anywhere then the given {code cf}
+     * is completed exceptionally (this method does not throw).
+     * @param e   The executor that should be used to call bs::getBody
+     * @param bs  The BodySubscriber
+     * @param cf  A completable future that this function will set up
+     *            to complete when the completion stage returned by
+     *            bs::getBody completes.
+     *            In case of any error while trying to set up the
+     *            completion chain, {@code cf} will be completed
+     *            exceptionally with that error.
+     * @param <T> The response type.
+     * @return The provided {@code cf}.
+     */
+    public static <T> CompletableFuture<T> getBodyAsync(Executor e,
+                                                      BodySubscriber<T> bs,
+                                                      CompletableFuture<T> cf) {
+        return getBodyAsync(e, bs, cf, cf::completeExceptionally);
+    }
+
+    /**
+     * Invokes bs::getBody using the provided executor.
+     * If invoking bs::getBody requires an executor, and the given executor
+     * is a {@link HttpClientImpl.DelegatingExecutor}, then the executor's
+     * delegate is used.
+     * The provided {@code cf} is completed with the result (exceptional
+     * or not) of the completion stage returned by bs::getBody.
+     * If an error occurs when trying to set up the
+     * completion chain, the provided {@code errorHandler} is invoked,
+     * but {@code cf} is not necessarily affected.
+     * This method does not throw.
+     * @param e   The executor that should be used to call bs::getBody
+     * @param bs  The BodySubscriber
+     * @param cf  A completable future that this function will set up
+     *            to complete when the completion stage returned by
+     *            bs::getBody completes.
+     *            In case of any error while trying to set up the
+     *            completion chain, {@code cf} will be completed
+     *            exceptionally with that error.
+     * @param errorHandler The handler to invoke if an error is raised
+     *                     while trying to set up the completion chain.
+     * @param <T> The response type.
+     * @return The provide {@code cf}. If the {@code errorHandler} is
+     * invoked, it is the responsibility of the {@code errorHandler} to
+     * complete the {@code cf}, if needed.
+     */
+    public static <T> CompletableFuture<T> getBodyAsync(Executor e,
+                                                      BodySubscriber<T> bs,
+                                                      CompletableFuture<T> cf,
+                                                      Consumer<Throwable> errorHandler) {
+        assert errorHandler != null;
+        try {
+            assert e != null;
+            assert cf != null;
+
+            if (TrustedSubscriber.needsExecutor(bs)) {
+                e = (e instanceof HttpClientImpl.DelegatingExecutor)
+                        ? ((HttpClientImpl.DelegatingExecutor) e).delegate() : e;
+            }
+
+            e.execute(() -> {
+                try {
+                    bs.getBody().whenComplete((r, t) -> {
+                        if (t != null) {
+                            cf.completeExceptionally(t);
+                        } else {
+                            cf.complete(r);
+                        }
+                    });
+                } catch (Throwable t) {
+                    errorHandler.accept(t);
+                }
+            });
+            return cf;
+
+        } catch (Throwable t) {
+            errorHandler.accept(t);
+        }
+        return cf;
+    }
 }

src/java.net.http/share/classes/jdk/internal/net/http/Stream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -333,21 +333,10 @@ class Stream<T> extends ExchangeImpl<T> {
     // pushes entire response body into response subscriber
     // blocking when required by local or remote flow control
     CompletableFuture<T> receiveData(BodySubscriber<T> bodySubscriber, Executor executor) {
-        responseBodyCF = new MinimalFuture<>();
         // We want to allow the subscriber's getBody() method to block so it
         // can work with InputStreams. So, we offload execution.
-        executor.execute(() -> {
+        responseBodyCF = ResponseSubscribers.getBodyAsync(executor, bodySubscriber,
-            try {
+                new MinimalFuture<>(), this::cancelImpl);
-                bodySubscriber.getBody().whenComplete((T body, Throwable t) -> {
-                    if (t == null)
-                        responseBodyCF.complete(body);
-                    else
-                        responseBodyCF.completeExceptionally(t);
-                });
-            } catch(Throwable t) {
-                cancelImpl(t);
-            }
-        });
 
         if (isCanceled()) {
             Throwable t = getCancelCause();

test/jdk/java/net/httpclient/GZIPInputStreamTest.java

@@ -0,0 +1,650 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8217264
+ * @summary Tests that you can map an InputStream to a GZIPInputStream
+ * @library /test/lib http2/server
+ * @build jdk.test.lib.net.SimpleSSLContext
+ * @modules java.base/sun.net.www.http
+ *          java.net.http/jdk.internal.net.http.common
+ *          java.net.http/jdk.internal.net.http.frame
+ *          java.net.http/jdk.internal.net.http.hpack
+ * @run testng/othervm GZIPInputStreamTest
+ */
+
+import com.sun.net.httpserver.HttpServer;
+import com.sun.net.httpserver.HttpsConfigurator;
+import com.sun.net.httpserver.HttpsServer;
+import jdk.test.lib.net.SimpleSSLContext;
+import org.testng.annotations.AfterTest;
+import org.testng.annotations.BeforeTest;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+import javax.net.ssl.SSLContext;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.UncheckedIOException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.net.http.HttpResponse.BodyHandler;
+import java.net.http.HttpResponse.BodyHandlers;
+import java.net.http.HttpResponse.BodySubscribers;
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+import static java.lang.System.out;
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.testng.Assert.assertEquals;
+
+public class GZIPInputStreamTest implements HttpServerAdapters {
+
+    SSLContext sslContext;
+    HttpTestServer httpTestServer;    // HTTP/1.1    [ 4 servers ]
+    HttpTestServer httpsTestServer;   // HTTPS/1.1
+    HttpTestServer http2TestServer;   // HTTP/2 ( h2c )
+    HttpTestServer https2TestServer;  // HTTP/2 ( h2  )
+    String httpURI;
+    String httpsURI;
+    String http2URI;
+    String https2URI;
+
+    static final int ITERATION_COUNT = 3;
+    // a shared executor helps reduce the amount of threads created by the test
+    // this test will block if the executor doesn't have at least two threads.
+    static final Executor executor = Executors.newFixedThreadPool(2);
+    static final Executor singleThreadExecutor = Executors.newSingleThreadExecutor();
+
+    public static final String LOREM_IPSUM =
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
+                    + "Proin et lorem a sem faucibus finibus. "
+                    + "Nam nisl nibh, elementum laoreet rutrum quis, lobortis at sem. "
+                    + "Aenean purus libero, vehicula sed auctor ac, finibus commodo massa. "
+                    + "Etiam dapibus nisl ex, viverra iaculis sapien suscipit sit amet. "
+                    + "Phasellus fringilla id orci sit amet convallis. "
+                    + "Nam suscipit tempor felis sed feugiat. "
+                    + "Mauris quis viverra justo, vitae vulputate turpis. "
+                    + "Ut eu orci eget ante faucibus volutpat quis quis urna. "
+                    + "Ut porttitor mattis diam, ac sollicitudin ligula volutpat vel. "
+                    + "Quisque pretium leo sed augue lacinia, eu mollis dui tempor.\n\n"
+                    + "Nullam at mi porttitor, condimentum enim et, tristique felis. "
+                    + "Nulla ante elit, interdum id ante ac, dignissim suscipit urna. "
+                    + "Sed rhoncus felis eget placerat tincidunt. "
+                    + "Duis pellentesque, eros et laoreet lacinia, urna arcu elementum metus, "
+                    + "et tempor nibh ante vel odio. "
+                    + "Donec et dolor posuere, sagittis libero sit amet, imperdiet ligula. "
+                    + "Sed aliquam nulla congue bibendum hendrerit. "
+                    + "Morbi ut tincidunt turpis. "
+                    + "Nullam semper ipsum et sem imperdiet, sit amet commodo turpis euismod. "
+                    + "Nullam aliquet metus id libero elementum, ut pulvinar urna gravida. "
+                    + "Nullam non rhoncus diam. "
+                    + "Mauris sagittis bibendum odio, sed accumsan sem ullamcorper ut.\n\n"
+                    + "Proin malesuada nisl a quam dignissim rhoncus. "
+                    + "Pellentesque vitae dui velit. "
+                    + "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
+                    + "Vivamus sagittis magna id magna vestibulum, nec lacinia odio maximus. "
+                    + "Nunc commodo, nisl non sagittis posuere, tortor ligula accumsan diam, "
+                    + "a rhoncus augue velit quis enim. "
+                    + "Nulla et dictum mauris. "
+                    + "Vivamus et accumsan mauris, et tincidunt nunc.\n\n"
+                    + "Nullam non pharetra lectus. "
+                    + "Fusce lobortis sapien ante, quis egestas tellus tincidunt efficitur. "
+                    + "Proin tempus mollis urna, sit amet congue diam eleifend in. "
+                    + "Ut auctor metus ipsum, at porta turpis consectetur sed. "
+                    + "Ut malesuada euismod massa, ut elementum nisi mattis eget. "
+                    + "Donec ultrices vel dolor at convallis. "
+                    + "Nunc eget felis nec nunc faucibus finibus. "
+                    + "Curabitur nec auctor metus, sit amet tristique lorem. "
+                    + "Donec tempus fringilla suscipit. Cras sit amet ante elit. "
+                    + "Ut sodales sagittis eros quis cursus. "
+                    + "Maecenas finibus ante quis euismod rutrum. "
+                    + "Aenean scelerisque placerat nisi. "
+                    + "Fusce porta, nibh vel efficitur sodales, urna eros consequat tellus, "
+                    + "at fringilla ex justo in mi. "
+                    + "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
+                    + "Morbi accumsan, justo nec tincidunt pretium, justo ex consectetur ante, "
+                    + "nec euismod diam velit vitae quam.\n\n"
+                    + "Vestibulum ante ipsum primis in faucibus orci luctus et "
+                    + "ultrices posuere cubilia Curae; "
+                    + "Praesent eget consequat nunc, vel dapibus nulla. "
+                    + "Maecenas egestas luctus consectetur. "
+                    + "Duis lacus risus, sollicitudin sit amet justo sed, "
+                    + "ultrices facilisis sapien. "
+                    + "Mauris eget fermentum risus. "
+                    + "Suspendisse potenti. Nam at tempor risus. "
+                    + "Quisque lacus augue, dictum vel interdum quis, interdum et mi. "
+                    + "In purus mauris, pellentesque et lectus eget, condimentum pretium odio."
+                    + " Donec imperdiet congue laoreet. "
+                    + "Cras pharetra hendrerit purus ac efficitur. \n";
+
+
+
+    @DataProvider(name = "variants")
+    public Object[][] variants() {
+        return new Object[][]{
+                { httpURI,   false },
+                { httpURI,   true },
+                { httpsURI,  false },
+                { httpsURI,  true },
+                { http2URI,  false },
+                { http2URI,  true },
+                { https2URI, false },
+                { https2URI, true },
+        };
+    }
+
+    final ReferenceTracker TRACKER = ReferenceTracker.INSTANCE;
+    HttpClient newHttpClient() {
+        return TRACKER.track(HttpClient.newBuilder()
+                         .executor(executor)
+                         .sslContext(sslContext)
+                         .build());
+    }
+
+    HttpClient newSingleThreadClient() {
+        return TRACKER.track(HttpClient.newBuilder()
+                .executor(singleThreadExecutor)
+                .sslContext(sslContext)
+                .build());
+    }
+
+    HttpClient newInLineClient() {
+        return TRACKER.track(HttpClient.newBuilder()
+                .executor((r) -> r.run() )
+                .sslContext(sslContext)
+                .build());
+    }
+
+    @Test(dataProvider = "variants")
+    public void testPlainSyncAsString(String uri, boolean sameClient) throws Exception {
+        out.println("\nSmoke test: verify that the result we get from the server is correct.");
+        out.println("Uses plain send() and `asString` to get the plain string.");
+        out.println("Uses single threaded executor");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newSingleThreadClient(); // should work with 1 single thread
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri +"/txt/LoremIpsum.txt"))
+                    .build();
+            BodyHandler<String> handler = BodyHandlers.ofString(UTF_8);
+            HttpResponse<String> response = client.send(req, handler);
+            String lorem = response.body();
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testPlainSyncAsInputStream(String uri, boolean sameClient) throws Exception {
+        out.println("Uses plain send() and `asInputStream` - calls readAllBytes() from main thread");
+        out.println("Uses single threaded executor");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newSingleThreadClient(); // should work with 1 single thread
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/txt/LoremIpsum.txt"))
+                    .build();
+            BodyHandler<InputStream> handler = BodyHandlers.ofInputStream();
+            HttpResponse<InputStream> response = client.send(req, handler);
+            String lorem = new String(response.body().readAllBytes(), UTF_8);
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testGZIPSyncAsInputStream(String uri, boolean sameClient) throws Exception {
+        out.println("Uses plain send() and `asInputStream` - " +
+                "creates GZIPInputStream and calls readAllBytes() from main thread");
+        out.println("Uses single threaded executor");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newSingleThreadClient(); // should work with 1 single thread
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/gz/LoremIpsum.txt.gz"))
+                    .build();
+            BodyHandler<InputStream> handler = BodyHandlers.ofInputStream();
+            HttpResponse<InputStream> response = client.send(req, handler);
+            GZIPInputStream gz = new GZIPInputStream(response.body());
+            String lorem = new String(gz.readAllBytes(), UTF_8);
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testGZIPSyncAsGZIPInputStream(String uri, boolean sameClient) throws Exception {
+        out.println("Uses plain send() and a mapping subscriber to "+
+                "create the GZIPInputStream. Calls readAllBytes() from main thread");
+        out.println("Uses a fixed thread pool executor with 2 thread");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newHttpClient(); // needs at least 2 threads
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/gz/LoremIpsum.txt.gz"))
+                    .build();
+            // This is dangerous, because the finisher will block.
+            // We support this, but the executor must have enough threads.
+            BodyHandler<InputStream> handler = new GZIPBodyHandler();
+            HttpResponse<InputStream> response = client.send(req, handler);
+            String lorem = new String(response.body().readAllBytes(), UTF_8);
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testGZIPSyncAsGZIPInputStreamSupplier(String uri, boolean sameClient) throws Exception {
+        out.println("Uses plain send() and a mapping subscriber to "+
+                "create a Supplier<GZIPInputStream>. Calls Supplier.get() " +
+                "and readAllBytes() from main thread");
+        out.println("Uses a single threaded executor");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newSingleThreadClient(); // should work with 1 single thread
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/gz/LoremIpsum.txt.gz"))
+                    .build();
+            // This is dangerous, because the finisher will block.
+            // We support this, but the executor must have enough threads.
+            BodyHandler<Supplier<InputStream>> handler = new BodyHandler<Supplier<InputStream>>() {
+                 public HttpResponse.BodySubscriber<Supplier<InputStream>> apply(
+                         HttpResponse.ResponseInfo responseInfo)
+                 {
+                    String contentType = responseInfo.headers().firstValue("Content-Encoding")
+                            .orElse("identity");
+                    out.println("Content-Encoding: " + contentType);
+                    if (contentType.equalsIgnoreCase("gzip")) {
+                        // This is dangerous. Blocking in the mapping function can wedge the
+                        // response. We do support it provided that there enough thread in
+                        // the executor.
+                        return BodySubscribers.mapping(BodySubscribers.ofInputStream(),
+                                (is) -> (() -> {
+                                    try {
+                                        return new GZIPInputStream(is);
+                                    } catch (IOException io) {
+                                        throw new UncheckedIOException(io);
+                                    }
+                                }));
+                    } else return BodySubscribers.mapping(BodySubscribers.ofInputStream(),
+                            (is) -> (() -> is));
+                }
+            };
+            HttpResponse<Supplier<InputStream>> response = client.send(req, handler);
+            String lorem = new String(response.body().get().readAllBytes(), UTF_8);
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testPlainAsyncAsInputStreamBlocks(String uri, boolean sameClient) throws Exception {
+        out.println("Uses sendAsync() and `asInputStream`. Registers a dependent action "+
+                "that calls readAllBytes()");
+        out.println("Uses a fixed thread pool executor with two threads");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newHttpClient(); // needs at least 2 threads
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/txt/LoremIpsum.txt"))
+                    .build();
+            BodyHandler<InputStream> handler = BodyHandlers.ofInputStream();
+            CompletableFuture<HttpResponse<InputStream>> responseCF = client.sendAsync(req, handler);
+            // This is dangerous. Blocking in the mapping function can wedge the
+            // response. We do support it provided that there enough threads in
+            // the executor.
+            String lorem = responseCF.thenApply((r) -> {
+                try {
+                    return new String(r.body().readAllBytes(), UTF_8);
+                } catch (IOException io) {
+                    throw new UncheckedIOException(io);
+                }
+            }).join();
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testGZIPAsyncAsGZIPInputStreamBlocks(String uri, boolean sameClient) throws Exception {
+        out.println("Uses sendAsync() and a mapping subscriber to create a GZIPInputStream. " +
+                 "Registers a dependent action that calls readAllBytes()");
+        out.println("Uses a fixed thread pool executor with two threads");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newHttpClient(); // needs at least 2 threads
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/gz/LoremIpsum.txt.gz"))
+                    .build();
+            BodyHandler<InputStream> handler = new GZIPBodyHandler();
+            CompletableFuture<HttpResponse<InputStream>> responseCF = client.sendAsync(req, handler);
+            // This is dangerous - we support this, but it can block
+            // if there are not enough threads available.
+            // Correct custom code should use thenApplyAsync instead.
+            String lorem = responseCF.thenApply((r) -> {
+                try {
+                    return new String(r.body().readAllBytes(), UTF_8);
+                } catch (IOException io) {
+                    throw new UncheckedIOException(io);
+                }
+            }).join();
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testGZIPSyncAsGZIPInputStreamBlocks(String uri, boolean sameClient) throws Exception {
+        out.println("Uses sendAsync() and a mapping subscriber to create a GZIPInputStream," +
+                "which is mapped again using a mapping subscriber " +
+                "to call readAllBytes() and map to String");
+        out.println("Uses a fixed thread pool executor with two threads");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newHttpClient(); // needs at least 2 threads
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/gz/LoremIpsum.txt.gz"))
+                    .build();
+            // This is dangerous. Blocking in the mapping function can wedge the
+            // response. We do support it provided that there enough thread in
+            // the executor.
+            BodyHandler<String> handler = new MappingBodyHandler<>(new GZIPBodyHandler(),
+                    (InputStream is) ->  {
+                        try {
+                            return new String(is.readAllBytes(), UTF_8);
+                        } catch(IOException io) {
+                            throw new UncheckedIOException(io);
+                        }
+                    });
+            HttpResponse<String> response = client.send(req, handler);
+            String lorem = response.body();
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    @Test(dataProvider = "variants")
+    public void testGZIPSyncAsGZIPInputStreamSupplierInline(String uri, boolean sameClient) throws Exception {
+        out.println("Uses plain send() and a mapping subscriber to "+
+                "create a Supplier<GZIPInputStream>. Calls Supplier.get() " +
+                "and readAllBytes() from main thread");
+        out.println("Uses an inline executor (no threads)");
+        HttpClient client = null;
+        for (int i=0; i< ITERATION_COUNT; i++) {
+            if (!sameClient || client == null)
+                client = newInLineClient(); // should even work with no threads
+
+            HttpRequest req = HttpRequest.newBuilder(URI.create(uri + "/gz/LoremIpsum.txt.gz"))
+                    .build();
+            // This is dangerous, because the finisher will block.
+            // We support this, but the executor must have enough threads.
+            BodyHandler<Supplier<InputStream>> handler = new BodyHandler<Supplier<InputStream>>() {
+                public HttpResponse.BodySubscriber<Supplier<InputStream>> apply(
+                        HttpResponse.ResponseInfo responseInfo)
+                {
+                    String contentType = responseInfo.headers().firstValue("Content-Encoding")
+                            .orElse("identity");
+                    out.println("Content-Encoding: " + contentType);
+                    if (contentType.equalsIgnoreCase("gzip")) {
+                        // This is dangerous. Blocking in the mapping function can wedge the
+                        // response. We do support it provided that there enough thread in
+                        // the executor.
+                        return BodySubscribers.mapping(BodySubscribers.ofInputStream(),
+                                (is) -> (() -> {
+                                    try {
+                                        return new GZIPInputStream(is);
+                                    } catch (IOException io) {
+                                        throw new UncheckedIOException(io);
+                                    }
+                                }));
+                    } else return BodySubscribers.mapping(BodySubscribers.ofInputStream(),
+                            (is) -> (() -> is));
+                }
+            };
+            HttpResponse<Supplier<InputStream>> response = client.send(req, handler);
+            String lorem = new String(response.body().get().readAllBytes(), UTF_8);
+            if (!LOREM_IPSUM.equals(lorem)) {
+                out.println("Response doesn't match");
+                out.println("[" + LOREM_IPSUM + "] != [" + lorem + "]");
+                assertEquals(LOREM_IPSUM, lorem);
+            } else {
+                out.println("Received expected response.");
+            }
+        }
+    }
+
+    static final class GZIPBodyHandler implements BodyHandler<InputStream> {
+        @Override
+        public HttpResponse.BodySubscriber<InputStream> apply(HttpResponse.ResponseInfo responseInfo) {
+            String contentType = responseInfo.headers().firstValue("Content-Encoding")
+                    .orElse("identity");
+            out.println("Content-Encoding: " + contentType);
+            if (contentType.equalsIgnoreCase("gzip")) {
+                // This is dangerous. Blocking in the mapping function can wedge the
+                // response. We do support it provided that there enough thread in
+                // the executor.
+                return BodySubscribers.mapping(BodySubscribers.ofInputStream(),
+                        (is) -> {
+                    try {
+                        return new GZIPInputStream(is);
+                    } catch (IOException io) {
+                        throw new UncheckedIOException(io);
+                    }
+                });
+            } else return BodySubscribers.ofInputStream();
+        }
+    }
+
+    static final class MappingBodyHandler<T,U> implements BodyHandler<U> {
+        final BodyHandler<T> upstream;
+        final Function<? super T,? extends U> finisher;
+        MappingBodyHandler(BodyHandler<T> upstream, Function<T,U> finisher) {
+            this.upstream = upstream;
+            this.finisher = finisher;
+        }
+        @Override
+        public HttpResponse.BodySubscriber<U> apply(HttpResponse.ResponseInfo responseInfo) {
+            return BodySubscribers.mapping(upstream.apply(responseInfo), finisher);
+        }
+    }
+
+    static String serverAuthority(HttpServer server) {
+        return InetAddress.getLoopbackAddress().getHostName() + ":"
+                + server.getAddress().getPort();
+    }
+
+    @BeforeTest
+    public void setup() throws Exception {
+        sslContext = new SimpleSSLContext().get();
+        if (sslContext == null)
+            throw new AssertionError("Unexpected null sslContext");
+
+        HttpTestHandler plainHandler = new LoremIpsumPlainHandler();
+        HttpTestHandler gzipHandler  = new LoremIpsumGZIPHandler();
+
+        // HTTP/1.1
+        InetSocketAddress sa = new InetSocketAddress(InetAddress.getLoopbackAddress(), 0);
+        httpTestServer = HttpTestServer.of(HttpServer.create(sa, 0));
+        httpTestServer.addHandler(plainHandler, "/http1/chunk/txt");
+        httpTestServer.addHandler(gzipHandler,  "/http1/chunk/gz");
+        httpURI = "http://" + httpTestServer.serverAuthority() + "/http1/chunk";
+
+        HttpsServer httpsServer = HttpsServer.create(sa, 0);
+        httpsServer.setHttpsConfigurator(new HttpsConfigurator(sslContext));
+        httpsTestServer = HttpTestServer.of(httpsServer);
+        httpsTestServer.addHandler(plainHandler, "/https1/chunk/txt");
+        httpsTestServer.addHandler(gzipHandler, "/https1/chunk/gz");
+        httpsURI = "https://" + httpsTestServer.serverAuthority() + "/https1/chunk";
+
+        // HTTP/2
+        http2TestServer = HttpTestServer.of(new Http2TestServer("localhost", false, 0));
+        http2TestServer.addHandler(plainHandler, "/http2/chunk/txt");
+        http2TestServer.addHandler(gzipHandler, "/http2/chunk/gz");
+        http2URI = "http://" + http2TestServer.serverAuthority() + "/http2/chunk";
+
+        https2TestServer = HttpTestServer.of(new Http2TestServer("localhost", true, sslContext));
+        https2TestServer.addHandler(plainHandler, "/https2/chunk/txt");
+        https2TestServer.addHandler(gzipHandler, "/https2/chunk/gz");
+        https2URI = "https://" + https2TestServer.serverAuthority() + "/https2/chunk";
+
+        httpTestServer.start();
+        httpsTestServer.start();
+        http2TestServer.start();
+        https2TestServer.start();
+    }
+
+    @AfterTest
+    public void teardown() throws Exception {
+        Thread.sleep(100);
+        AssertionError fail = TRACKER.check(500);
+        try {
+            httpTestServer.stop();
+            httpsTestServer.stop();
+            http2TestServer.stop();
+            https2TestServer.stop();
+        } finally {
+            if (fail != null) {
+                throw fail;
+            }
+        }
+    }
+
+
+    static class LoremIpsumPlainHandler implements HttpTestHandler {
+        @Override
+        public void handle(HttpTestExchange t) throws IOException {
+            try {
+                out.println("LoremIpsumPlainHandler received request to " + t.getRequestURI());
+                t.getResponseHeaders().addHeader("Content-Encoding", "identity");
+                t.sendResponseHeaders(200, -1);
+                long size = 0;
+                try (OutputStream os = t.getResponseBody()) {
+                    for (String s : LOREM_IPSUM.split("\n")) {
+                        byte[] buf = s.getBytes(StandardCharsets.UTF_8);
+                        System.out.println("Writing " + (buf.length + 1) + " bytes...");
+                        os.write(buf);
+                        os.write('\n');
+                        os.flush();
+                        size += buf.length + 1;
+                    }
+                } finally {
+                    System.out.println("Sent " + size + " bytes");
+                }
+            } catch (IOException | RuntimeException | Error e) {
+                e.printStackTrace();
+                throw e;
+            }
+        }
+    }
+
+    static class LoremIpsumGZIPHandler implements HttpTestHandler {
+        @Override
+        public void handle(HttpTestExchange t) throws IOException {
+            try {
+                out.println("LoremIpsumGZIPHandler received request to " + t.getRequestURI());
+                t.getResponseHeaders().addHeader("Content-Encoding", "gzip");
+                t.sendResponseHeaders(200, -1);
+                long size = 0;
+                try (GZIPOutputStream os =
+                             new GZIPOutputStream(t.getResponseBody())) {
+                    for (String s : LOREM_IPSUM.split("\n")) {
+                        byte[] buf = s.getBytes(StandardCharsets.UTF_8);
+                        System.out.println("Writing and compressing "
+                                + (buf.length + 1) + " uncompressed bytes...");
+                        os.write(buf);
+                        os.write('\n');
+                        os.flush();
+                        size += buf.length + 1;
+                    }
+                } finally {
+                    System.out.println("Sent and compressed " + size + " uncompressed bytes");
+                }
+            } catch (IOException | RuntimeException | Error e) {
+                e.printStackTrace();
+                throw e;
+            }
+        }
+    }
+
+}