| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ======================================================================== |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| |
| [[http2-configuring]] |
| === Configuring HTTP/2 |
| |
| Enabling the HTTP/2 module in the Jetty server does not create a HTTP/2 specific connector, but rather it adds a HTTP/2 Connection factory to an |
| existing connector. |
| Thus configuring HTTP/2 is a combination of configuring common properties on the connector and HTTP/2 specific properties on the connection factory. |
| The modules and XML files involved can be seen with the following commands: |
| |
| [source,screen, subs="{sub-order}"] |
| .... |
| $ java -jar $JETTY_HOME/start.jar --list-modules |
| ... |
| 1) protonego-boot <transitive> |
| ... |
| 2) http ${jetty.base}/start.d/http.ini |
| 2) ssl ${jetty.base}/start.d/ssl.ini |
| 3) alpn ${jetty.base}/start.d/alpn.ini |
| 3) http2c ${jetty.base}/start.d/http2c.ini |
| ... |
| 4) http2 ${jetty.base}/start.d/http2.ini |
| 5) https ${jetty.base}/start.d/https.ini |
| |
| $ java -jar $JETTY_HOME/start.jar --list-config |
| ... |
| ${jetty.home}/etc/jetty-ssl.xml |
| ${jetty.home}/etc/jetty-ssl-context.xml |
| ${jetty.home}/etc/jetty-alpn.xml |
| ${jetty.home}/etc/jetty-http2c.xml |
| ${jetty.home}/etc/jetty-http.xml |
| ... |
| ${jetty.home}/etc/jetty-http2.xml |
| ${jetty.home}/etc/jetty-https.xml |
| .... |
| |
| The common properties associated with connectors (host,port, timeouts, etc.) can be set in the module ini files (or `start.ini` if `--add-to-start` was used): `${jetty.base}/start.d/http.ini` and `${jetty.base}/start.d/ssl.ini`. |
| These properties are instantiated in the associated XML files: `${jetty.home}/etc/jetty-http.xml`; `${jetty.home}/etc/jetty-ssl.xml`, plus the SSL keystore is instantiated in `${jetty.home}/etc/jetty-ssl-context.xml`. |
| |
| ____ |
| [NOTE] |
| If you are planning to edit XML files, make sure to copy them to your `{$jetty.base}/etc/` directory before doing so. |
| The XML files that come with the Jetty distribution should *not* be modified directly. |
| ____ |
| |
| HTTP/2 specific properties can be set in the module ini files: `${jetty.base}/start.d/http2.ini` and `${jetty.base}/start.d/http2c.ini`, which are instantiated in the associated XML files: `${jetty.home}/etc/jetty-http2.xml`; `${jetty.home}/etc/jetty-http2c.xml`, respectively. |
| Currently there are very few HTTP/2 configuration properties and the default values are reasonable: |
| |
| .HTTP/2 Configuration Properties |
| [cols=",",options="header",] |
| |======================================================================= |
| |Property |Description |
| |jetty.http2.maxConcurrentStreams |The maximum number of concurrently open streams allowed on a single HTTP/2 connection (default 1024). Larger values increase parallelism but cost a memory commitment. |
| |jetty.http2.initialStreamRecvWindow |The initial receive flow control window size for a new stream (default 65535). Larger values may allow greater throughput but also risk head of line blocking if TCP/IP flow control is triggered. |
| |======================================================================= |
