All RPC interfaces for a given node (see rpc_interfaces) currently support HTTP/1.1. A specific RPC interface can also support HTTP/2 by setting the
"app_protocol" configuration entry to
"HTTP2" for that interface.
Support for HTTP/2 is currently experimental (e.g. only a single stream per session is supported). See https://github.com/microsoft/CCF/issues/3342 for progress updates.
Operators can cap the size of client HTTP requests (body and header) for each RPC interface in the http_configuration configuration section. These configuration entries are optional and have sensible default values.