The {@link oajrc.RestClient.Builder#basicAuth(String,int,String,String)} method
can be used to quickly enable BASIC authentication support.
| // Create a client that performs BASIC authentication using the specified user/pw.
| RestClient client = RestClient.create()
| .basicAuth(HOST, PORT, USER, PW)
| .build();
This is functionally equivalent to the following:
| RestClient.Builder builder = RestClient.create();
| AuthScope scope = new AuthScope(HOST, PORT);
| Credentials up = new UsernamePasswordCredentials(USER, PW);
| CredentialsProvider provider = new BasicCredentialsProvider();
| provider.setCredentials(scope, up);
| builder.setDefaultCredentialsProvider(provider);