How can I change the feign URL during the runtime?

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You can add an unannotated URI parameter (that can potentially be determined at runtime) and that will be the base path that will be used for the request. E.g.:

    @FeignClient(name = "dummy-name", url = "https://this-is-a-placeholder.com")
    public interface MyClient {
        @PostMapping(path = "/create")
        UserDto createUser(URI baseUrl, @RequestBody UserDto userDto);
    }

And then the usage will be:

    @Autowired 
    private MyClient myClient;
    ...
    URI determinedBasePathUri = URI.create("https://my-determined-host.com");
    myClient.createUser(determinedBasePathUri, userDto);

This will send a POST request to https://my-determined-host.com/create (source).

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