Retrofit2+Okhttp3添加统一请求头

public class HeaderInterceptor implements Interceptor {
    @NonNull
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request original = chain.request();
        Request.Builder requestBuilder = original.newBuilder()
                .addHeader("version", "1.0.0")
                .addHeader("自定义key", "自定义value");
        Request request = requestBuilder.build();
        return chain.proceed(request);
    }
}

OkHttpClient okHttpClient = new OkHttpClient.Builder()
                ...
                .addInterceptor(new HeaderInterceptor())
                ...
                .connectTimeout(20, TimeUnit.SECONDS)
                .build();