CoCo guest components use lightweight ttRPC for internal communication to reduce the memory footprint and dependency. But many internal services also needed by containers like get_resource, get_evidence and get_token, we export these services with restful API, now CoCo containers can easy access these API with http client. Here are some examples, for detail info, please refer rest API
$ ./api-server-rest --features=all
Starting API server on 127.0.0.1:8006
API Server listening on http://127.0.0.1:8006
$ curl http://127.0.0.1:8006/cdh/resource/default/key/1
12345678901234567890123456xxxx
$ curl http://127.0.0.1:8006/aa/evidence\?runtime_data\=xxxx
{"svn":"1","report_data":"eHh4eA=="}
$ curl http://127.0.0.1:8006/aa/token\?token_type\=kbs
{"token":"eyJhbGciOiJFi...","tee_keypair":"-----BEGIN... "}