Change host at runtime with Retrofit 2

EndpointInterceptor.java

public abstract class EndpointInterceptor implements Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {
        Request originalRequest = chain.request();
        HttpUrl newUrl = replaceHost(originalRequest);
        Request completeRequest = originalRequest.newBuilder()
                .url(newUrl)
                .build();

        return chain.proceed(completeRequest);
    }

    @NonNull
    private HttpUrl replaceHost(Request originalRequest) {
        HttpUrl originalUrl = originalRequest.httpUrl();
        return originalUrl.newBuilder()
                .host(getHost())
                .build();
    }

    @NonNull
    private String getHost() {
        String url = getUrl();
        if (url.endsWith("/")) {
            url = new StringBuilder(url)
                    .deleteCharAt(url.length() - 1)
                    .toString();
        }
        return HttpUrl.parse(url)
                .host();
    }

    protected abstract String getUrl();
}