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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
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