Okhttp+Retrofit下访问百度音乐api出现403 forbidden的解决方案

初步猜测原因：
okhttp并非原生的http请求，它在header里面并没有真正的User-Agent，而是“okhttp/版本号”这样的字符串；

解决方案：
为okhttp设置User-Agent可以解决问题。

OkHttpClient.Builder builder = new OkHttpClient().newBuilder() ;  
builder.addInterceptor(new Interceptor() {  @Override  public Response intercept(Chain chain) throws IOException {  Request newRequest = chain.request().newBuilder()  .removeHeader("User-Agent")  .addHeader("User-Agent","Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:0.9.4)").build() ;  return chain.proceed(newRequest);  }  
}) ;  

OkHttpClient client = builder.build() ; Retrofit retrofit  = new Retrofit.Builder()  .baseUrl(baseUrl)  .addConverterFactory(FastJsonConverterFactory.create())  .addCallAdapterFactory(RxJavaCallAdapterFactory.create())  .client(client)  .build();