Configuring HTTP/2 for Tomcat 8.5 and above

Tomcat 8.5 and above support HTTP/2 (see https://tomcat.apache.org/tomcat-8.5-doc/config/http2.html).

In a standalone installation you need to configure an element UpgradeProtocol inside the Connector in server.xml:

server.xml

<Connector port="8443" protocol="..." sslImplementationName="...">
    <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol"/>
...
</Connector>

These properties control the generation of the server.xml configuration file.

Remark: The file generation doesn't have any logic nor it doesn't do any validation. It's just an XML replacement and adding mechanism.

Connector attributes

Property name	Java name	Default	Description
cargo.tomcat.connector.protocolClass	TomcatPropertySet.CONNECTOR_PROTOCOL_CLASS	HTTP/1.1	Sets the protocol of the connector, see https://tomcat.apache.org/tomcat-8.5-doc/config/http.html for details
cargo.tomcat.connector.sslImplementationName	TomcatPropertySet.CONNECTOR_SSL_IMPLEMENTATION_NAME	org.apache.tomcat.util.net.openssl.OpenSSLImplementation	The SSL implementation to be used, see https://tomcat.apache.org/tomcat-8.5-doc/config/http.html for details

UpgradeProtocol element

Property name	Java name	Description
cargo.tomcat.connector.httpUpgradeProtocol	TomcatPropertySet.CONNECTOR_HTTP_UPGRADE_PROTOCOL	Must be `org.apache.coyote.http2.Http2Protocol`, if set the `<UpgradeProtocol>` element will be added