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Creating Feign Clients Manually

In some cases it might be necessary to customize your Feign Clients in a way that is not possible using the methods above. In this case you can create Clients using the Feign Builder API. Below is an example which creates two Feign Clients with the same interface but configures each one with a separate request interceptor.

@Import(FeignClientsConfiguration.class)
class FooController {

	private FooClient fooClient;

	private FooClient adminClient;

    	@Autowired
	public FooController(Decoder decoder, Encoder encoder, Client client, Contract contract) {
		this.fooClient = Feign.builder().client(client)
				.encoder(encoder)
				.decoder(decoder)
				.contract(contract)
				.requestInterceptor(new BasicAuthRequestInterceptor("user", "user"))
				.target(FooClient.class, "https://PROD-SVC");

		this.adminClient = Feign.builder().client(client)
				.encoder(encoder)
				.decoder(decoder)
				.contract(contract)
				.requestInterceptor(new BasicAuthRequestInterceptor("admin", "admin"))
				.target(FooClient.class, "https://PROD-SVC");
    }
}

In the above example FeignClientsConfiguration.class is the default configuration provided by Spring Cloud Netflix.

PROD-SVC is the name of the service the Clients will be making requests to.

The Feign Contract object defines what annotations and values are valid on interfaces. The autowired Contract bean provides supports for SpringMVC annotations, instead of the default Feign native annotations.