Read about the Http support in the reference guide

See the list of available samples:

Sample	Description	Sources
sample-swagger	Auto generate tests from Open API
sample-http-form-data	Exchange form data via Http GET/POST
sample-http-basic-auth	Basic authentication on client and server components
sample-http-loadtest	Calls REST API on Http server with multiple threads for load testing
sample-https	Shows how to use SSL connectivity as a client and server
sample-http	Shows REST API calls as a client