Merge pull request quarkusio#31192 from Sgitario/13969

Support HTTP/2 connections in REST Client Reactive

docs/src/main/asciidoc/rest-client-reactive.adoc

@@ -296,6 +296,27 @@ quarkus.rest-client.extensions-api.verify-host=false
 This setting should not be used in production as it will disable the SSL hostname verification.
 ====
 
+=== HTTP/2 Support
+
+HTTP/2 is disabled by default in REST Client. If you want to enable it, you can set:
+
+[source, properties]
+----
+// for all REST Clients:
+quarkus.rest-client.http2=true
+// or for a single REST Client:
+quarkus.rest-client.extensions-api.http2=true
+----
+
+Alternatively, you can enable the Application-Layer Protocol Negotiation (alpn) TLS extension and the client will negotiate which HTTP version to use over the ones compatible by the server. By default, it will try to use HTTP/2 first and if it's not enabled, it will use HTTP/1.1. If you want to enable it, you can set:
+
+[source, properties]
+----
+quarkus.rest-client.alpn=true
+// or for a single REST Client:
+quarkus.rest-client.extensions-api.alpn=true
+----
+
 == Create the JAX-RS resource
 
 Create the `src/main/java/org/acme/rest/client/ExtensionsResource.java` file with the following content:

extensions/resteasy-classic/rest-client-config/runtime/src/main/java/io/quarkus/restclient/config/RestClientConfig.java

@@ -47,6 +47,8 @@ public class RestClientConfig {
         EMPTY.shared = Optional.empty();
         EMPTY.name = Optional.empty();
         EMPTY.userAgent = Optional.empty();
+        EMPTY.http2 = Optional.empty();
+        EMPTY.alpn = Optional.empty();
     }
 
     /**
@@ -245,6 +247,21 @@ public class RestClientConfig {
     @ConfigItem
     public Optional<String> userAgent;
 
+    /**
+     * If this is true then HTTP/2 will be enabled.
+     */
+    @ConfigItem
+    public Optional<Boolean> http2;
+
+    /**
+     * If the Application-Layer Protocol Negotiation is enabled, the client will negotiate which protocol to use over the
+     * protocols exposed by the server. By default, it will try to use HTTP/2 first and if it's not enabled, it will
+     * use HTTP/1.1.
+     * When the property `http2` is enabled, this flag will be automatically enabled.
+     */
+    @ConfigItem
+    public Optional<Boolean> alpn;
+
     public static RestClientConfig load(String configKey) {
         final RestClientConfig instance = new RestClientConfig();
 
@@ -276,6 +293,7 @@ public static RestClientConfig load(String configKey) {
         instance.shared = getConfigValue(configKey, "shared", Boolean.class);
         instance.name = getConfigValue(configKey, "name", String.class);
         instance.userAgent = getConfigValue(configKey, "user-agent", String.class);
+        instance.http2 = getConfigValue(configKey, "http2", Boolean.class);
 
         return instance;
     }
@@ -311,6 +329,8 @@ public static RestClientConfig load(Class<?> interfaceClass) {
         instance.shared = getConfigValue(interfaceClass, "shared", Boolean.class);
         instance.name = getConfigValue(interfaceClass, "name", String.class);
         instance.userAgent = getConfigValue(interfaceClass, "user-agent", String.class);
+        instance.http2 = getConfigValue(interfaceClass, "http2", Boolean.class);
+        instance.alpn = getConfigValue(interfaceClass, "alpn", Boolean.class);
 
         return instance;
     }

extensions/resteasy-classic/rest-client-config/runtime/src/main/java/io/quarkus/restclient/config/RestClientsConfig.java

@@ -282,6 +282,21 @@ public class RestClientsConfig {
     @ConfigItem
     public Optional<String> keyStoreType;
 
+    /**
+     * If this is true then HTTP/2 will be enabled.
+     */
+    @ConfigItem(defaultValue = "false")
+    public boolean http2;
+
+    /**
+     * If the Application-Layer Protocol Negotiation is enabled, the client will negotiate which protocol to use over the
+     * protocols exposed by the server. By default, it will try to use HTTP/2 first and if it's not enabled, it will
+     * use HTTP/1.1.
+     * When the property `http2` is enabled, this flag will be automatically enabled.
+     */
+    @ConfigItem
+    public Optional<Boolean> alpn;
+
     public RestClientConfig getClientConfig(String configKey) {
         if (configKey == null) {
             return RestClientConfig.EMPTY;

extensions/resteasy-reactive/rest-client-reactive/runtime/src/main/java/io/quarkus/rest/client/reactive/runtime/RestClientBuilderImpl.java

@@ -337,6 +337,10 @@ public <T> T build(Class<T> aClass) throws IllegalStateException, RestClientDefi
             clientBuilder.setUserAgent(restClientsConfig.userAgent.get());
         }
 
+        if (getConfiguration().hasProperty(QuarkusRestClientProperties.HTTP2)) {
+            clientBuilder.http2((Boolean) getConfiguration().getProperty(QuarkusRestClientProperties.HTTP2));
+        }
+
         if (proxyHost != null) {
             configureProxy(proxyHost, proxyPort, proxyUser, proxyPassword, nonProxyHosts);
         } else if (restClientsConfig.proxyAddress.isPresent()) {

extensions/resteasy-reactive/rest-client-reactive/runtime/src/main/java/io/quarkus/rest/client/reactive/runtime/RestClientCDIDelegateBuilder.java

@@ -123,6 +123,16 @@ private void configureCustomProperties(RestClientBuilder builder) {
         if (userAgent.isPresent()) {
             builder.property(QuarkusRestClientProperties.USER_AGENT, userAgent.get());
         }
+
+        Boolean http2 = oneOf(clientConfigByClassName().http2,
+                clientConfigByConfigKey().http2).orElse(configRoot.http2);
+        builder.property(QuarkusRestClientProperties.HTTP2, http2);
+
+        Optional<Boolean> alpn = oneOf(clientConfigByClassName().alpn,
+                clientConfigByConfigKey().alpn, configRoot.alpn);
+        if (alpn.isPresent()) {
+            builder.property(QuarkusRestClientProperties.ALPN, alpn.get());
+        }
     }
 
     private void configureProxy(RestClientBuilderImpl builder) {

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/api/QuarkusRestClientProperties.java

@@ -63,4 +63,14 @@ public class QuarkusRestClientProperties {
 
     public static final String USER_AGENT = "io.quarkus.rest.client.user-agent";
 
+    /**
+     * Set to true to explicitly use the HTTP/2 version.
+     */
+    public static final String HTTP2 = "io.quarkus.rest.client.http2";
+
+    /**
+     * Set to true to explicitly use the Application-Layer Protocol Negotiation extension.
+     */
+    public static final String ALPN = "io.quarkus.rest.client.alpn";
+
 }

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/handlers/ClientSendRequestHandler.java

@@ -58,6 +58,7 @@
 import io.vertx.core.http.HttpClientRequest;
 import io.vertx.core.http.HttpClientResponse;
 import io.vertx.core.http.HttpMethod;
+import io.vertx.core.http.HttpVersion;
 import io.vertx.core.http.RequestOptions;
 import io.vertx.core.streams.Pipe;
 import io.vertx.core.streams.Pump;
@@ -114,6 +115,9 @@ public void handle(Void ignored) {
         future.subscribe().with(new Consumer<>() {
             @Override
             public void accept(HttpClientRequest httpClientRequest) {
+                // adapt headers to HTTP/2 depending on the underlying HTTP connection
+                ClientSendRequestHandler.this.adaptRequest(httpClientRequest);
+
                 if (requestContext.isMultipart()) {
                     Promise<HttpClientRequest> requestPromise = Promise.promise();
                     QuarkusMultipartFormUpload actualEntity;
@@ -458,6 +462,7 @@ private QuarkusMultipartFormUpload setMultipartHeadersAndPrepareBody(HttpClientR
             throw new IllegalArgumentException(
                     "Multipart form upload expects an entity of type MultipartForm, got: " + state.getEntity().getEntity());
         }
+
         MultivaluedMap<String, String> headerMap = state.getRequestHeaders().asMap();
         updateRequestHeadersFromConfig(state, headerMap);
         QuarkusMultipartForm multipartForm = (QuarkusMultipartForm) state.getEntity().getEntity();
@@ -470,6 +475,7 @@ private QuarkusMultipartFormUpload setMultipartHeadersAndPrepareBody(HttpClientR
         }
         QuarkusMultipartFormUpload multipartFormUpload = new QuarkusMultipartFormUpload(Vertx.currentContext(), multipartForm,
                 true, mode);
+        httpClientRequest.setChunked(multipartFormUpload.isChunked());
         setEntityRelatedHeaders(headerMap, state.getEntity());
 
         // multipart has its own headers:
@@ -507,6 +513,25 @@ private Buffer setRequestHeadersAndPrepareBody(HttpClientRequest httpClientReque
         return actualEntity;
     }
 
+    private void adaptRequest(HttpClientRequest request) {
+        if (request.version() == HttpVersion.HTTP_2) {
+            // When using the protocol HTTP/2, Netty which is internally used by Vert.x will validate the headers and reject
+            // the requests with invalid metadata.
+            // When we start a new connection, the Vert.x client will automatically upgrade the first request we make to be
+            // valid in HTTP/2.
+            // The problem is that in next requests, the Vert.x client reuses the same connection within the same window time
+            // and hence does not upgrade the following requests. Therefore, even though the first request works fine, the
+            // next requests won't work.
+            // This has been reported in https://github.com/eclipse-vertx/vert.x/issues/4618.
+            // To workaround this issue, we need to "upgrade" the next requests by ourselves when the version is already set
+            // to HTTP/2:
+            if (request.path() == null || request.path().length() == 0) {
+                // HTTP/2 does not allow empty paths
+                request.setURI(request.getURI() + "/");
+            }
+        }
+    }
+
     private void updateRequestHeadersFromConfig(RestClientRequestContext state, MultivaluedMap<String, String> headerMap) {
         Object staticHeaders = state.getConfiguration().getProperty(QuarkusRestClientProperties.STATIC_HEADERS);
         if (staticHeaders instanceof Map) {

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientBuilderImpl.java

@@ -36,6 +36,7 @@
 
 import io.vertx.core.buffer.Buffer;
 import io.vertx.core.http.HttpClientOptions;
+import io.vertx.core.http.HttpVersion;
 import io.vertx.core.net.JksOptions;
 import io.vertx.core.net.ProxyOptions;
 
@@ -54,6 +55,8 @@ public class ClientBuilderImpl extends ClientBuilder {
     private SSLContext sslContext;
     private KeyStore trustStore;
     private char[] trustStorePassword;
+    private boolean http2;
+    private boolean alpn;
 
     private String proxyHost;
     private int proxyPort;
@@ -134,6 +137,16 @@ public ClientBuilder readTimeout(long timeout, TimeUnit unit) {
         return this;
     }
 
+    public ClientBuilder http2(boolean http2) {
+        this.http2 = http2;
+        return this;
+    }
+
+    public ClientBuilder alpn(boolean alpn) {
+        this.alpn = alpn;
+        return this;
+    }
+
     public ClientBuilder proxy(String proxyHost, int proxyPort) {
         this.proxyPort = proxyPort;
         this.proxyHost = proxyHost;
@@ -182,6 +195,14 @@ public ClientImpl build() {
 
         HttpClientOptions options = Optional.ofNullable(configuration.getFromContext(HttpClientOptions.class))
                 .orElseGet(HttpClientOptions::new);
+        if (http2) {
+            options.setProtocolVersion(HttpVersion.HTTP_2);
+        }
+
+        if (http2 || alpn) {
+            options.setUseAlpn(true);
+            options.setAlpnVersions(List.of(HttpVersion.HTTP_2, HttpVersion.HTTP_1_1));
+        }
 
         options.setVerifyHost(verifyHost);
         if (trustAll) {

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientImpl.java

@@ -147,6 +147,7 @@ public Vertx get() {
         Object connectionTTL = configuration.getProperty(CONNECTION_TTL);
         if (connectionTTL != null) {
             options.setKeepAliveTimeout((int) connectionTTL);
+            options.setHttp2KeepAliveTimeout((int) connectionTTL);
         }
 
         Object connectionPoolSize = configuration.getProperty(CONNECTION_POOL_SIZE);
@@ -156,6 +157,7 @@ public Vertx get() {
             log.debugf("Setting connectionPoolSize to %d", connectionPoolSize);
         }
         options.setMaxPoolSize((int) connectionPoolSize);
+        options.setHttp2MaxPoolSize((int) connectionPoolSize);
 
         Object keepAliveEnabled = configuration.getProperty(KEEP_ALIVE_ENABLED);
         if (keepAliveEnabled != null) {

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientResponseImpl.java

@@ -67,4 +67,8 @@ restClientRequestContext.properties, restClientRequestContext, getStringHeaders(
             throw new ProcessingException(e);
         }
     }
+
+    public String getHttpVersion() {
+        return restClientRequestContext.getVertxClientResponse().version().toString();
+    }
 }

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/multipart/MultiByteHttpData.java

@@ -343,6 +343,11 @@ public void setContentTransferEncoding(String contentTransferEncoding) {
         this.contentTransferEncoding = contentTransferEncoding;
     }
 
+    @Override
+    public long length() {
+        return buffer.readableBytes() + super.length();
+    }
+
     @Override
     public String toString() {
         return HttpHeaderNames.CONTENT_DISPOSITION + ": " +

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/multipart/PausableHttpPostRequestEncoder.java

@@ -44,7 +44,6 @@
 import io.netty.handler.codec.http.HttpHeaders;
 import io.netty.handler.codec.http.HttpMethod;
 import io.netty.handler.codec.http.HttpRequest;
-import io.netty.handler.codec.http.HttpUtil;
 import io.netty.handler.codec.http.HttpVersion;
 import io.netty.handler.codec.http.LastHttpContent;
 import io.netty.handler.codec.http.multipart.Attribute;
@@ -855,7 +854,6 @@ public HttpRequest finalizeRequest() throws ErrorDataEncoderException {
                     }
                 }
             }
-            HttpUtil.setTransferEncodingChunked(request, true);
 
             // wrap to hide the possible content
             return new WrappedHttpRequest(request);

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/multipart/QuarkusMultipartFormUpload.java

@@ -2,7 +2,6 @@
 
 import java.io.File;
 import java.nio.charset.Charset;
-import java.util.concurrent.atomic.AtomicInteger;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.UnpooledByteBufAllocator;
@@ -11,6 +10,7 @@
 import io.netty.handler.codec.http.HttpContent;
 import io.netty.handler.codec.http.HttpRequest;
 import io.netty.handler.codec.http.HttpVersion;
+import io.netty.handler.codec.http.LastHttpContent;
 import io.netty.handler.codec.http.multipart.DefaultHttpDataFactory;
 import io.netty.handler.codec.http.multipart.FileUpload;
 import io.netty.handler.codec.http.multipart.MemoryFileUpload;
@@ -148,25 +148,24 @@ public void run() {
             throw new IllegalArgumentException("Wrong Vert.x context used for multipart upload. Expected: " + context +
                     ", actual: " + Vertx.currentContext());
         }
-        AtomicInteger counter = new AtomicInteger();
         while (!ended) {
             if (encoder.isChunked()) {
                 try {
                     HttpContent chunk = encoder.readChunk(ALLOC);
                     if (chunk == PausableHttpPostRequestEncoder.WAIT_MARKER) {
                         return; // resumption will be scheduled by encoder
-                    }
-                    ByteBuf content = chunk.content();
-                    Buffer buff = Buffer.buffer(content);
-                    counter.incrementAndGet();
-                    boolean writable = pending.write(buff);
-                    if (encoder.isEndOfInput()) {
+                    } else if (chunk == LastHttpContent.EMPTY_LAST_CONTENT || encoder.isEndOfInput()) {
                         ended = true;
                         request = null;
                         encoder = null;
                         pending.write(InboundBuffer.END_SENTINEL);
-                    } else if (!writable) {
-                        break;
+                    } else {
+                        ByteBuf content = chunk.content();
+                        Buffer buff = Buffer.buffer(content);
+                        boolean writable = pending.write(buff);
+                        if (!writable) {
+                            break;
+                        }
                     }
                 } catch (Exception e) {
                     handleError(e);
@@ -184,6 +183,10 @@ public void run() {
         }
     }
 
+    public boolean isChunked() {
+        return encoder.isChunked();
+    }
+
     private void handleError(Throwable e) {
         ended = true;
         request = null;

integration-tests/pom.xml

@@ -298,6 +298,7 @@
                 <module>rest-client</module>
                 <module>resteasy-reactive-kotlin</module>
                 <module>rest-client-reactive</module>
+                <module>rest-client-reactive-http2</module>
                 <module>rest-client-reactive-kotlin-serialization</module>
                 <module>rest-client-reactive-multipart</module>
                 <module>rest-client-reactive-stork</module>