自定义拦截器(请求头)

builder.addInterceptor(new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request();
            SharedPreferences preferences = MyApp.getApplication().getSharedPreferences("user", Context.MODE_PRIVATE);
            String userId = preferences.getString("UserId", "");
            String sessionId = preferences.getString("SessionId", "");
            Request.Builder builder1 = request.newBuilder();
            builder1.method(request.method(),request.body());

            if(!TextUtils.isEmpty(userId)&&!TextUtils.isEmpty(sessionId)){
                builder1.addHeader("userId",userId);
                builder1.addHeader("sessionId",sessionId);
            }
            Request build = builder1.build();
            return chain.proceed(build);
        }
    });

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