The HTTP client embedded to invoke external REST resources uses a connection pool. This connection pool can't be configured and is limited by default to:
- max number of open connections for all target hosts: 20,
- default max number of open connections for a given target host: 2.
The max number of connections open for all target hosts should be defined according to the number of message processors. And we should be able to configure the default max number of open connections per host according to a component parameter.