retrofit2.adapter.rxjava2.HttpException: HTTP 403 Forbidden

某些API应该是服务器设置了限制，使得手机端okhttp作为 http客户端时，获取数据，服务器返回HTTP 403禁止访问。

服务器禁止访问了，因为okhttp并不是真正的原生的http请求，它在header中并没有真正的User-Agent，而是“okhttp/版本号”。

如果是单纯的okHttp请求，不加Retrofit的

Request request = new Request.Builder().url(url)
                             .removeHeader("User-Agent")
                             .addHeader("User-Agent", WebSettings.getDefaultUserAgent(App.getINSTANCE()))
                              .build();
            httpClient.newCall(request).enqueue(handler);

如果是okHttp+Retrofit

public class NetWork {

    private static MusicApi musicApi;
    private static Converter.Factory gsonConverterFactory = GsonConverterFactory.create();
    private static CallAdapter.Factory rxJavaCallAdapterFactory = RxJava2CallAdapterFactory.create();


    public static MusicApi getMusicApi() {
        if (musicApi == null) {
            Retrofit retrofit = new Retrofit.Builder()
                    .client(getOkHttpClient())//获取后的okhttp头部
                    .baseUrl("http://tingapi.ting.baidu.com/v1/restserver/")
                    .addConverterFactory(gsonConverterFactory)
                    .addCallAdapterFactory(rxJavaCallAdapterFactory)
                    .build();
            musicApi = retrofit.create(MusicApi.class);
        }
        return musicApi;
    }
    /**
     *  构造okhttp头部
     *
     * */
    private static OkHttpClient getOkHttpClient() {
        OkHttpClient httpClient = new OkHttpClient.Builder()
                .addInterceptor(new Interceptor() {
                    @Override
                    public Response intercept(Chain chain) throws IOException {
                        Request request = chain.request()
                                .newBuilder()
                                .removeHeader("User-Agent")//移除旧的
                                .addHeader("User-Agent", WebSettings.getDefaultUserAgent(App.getINSTANCE()))//添加真正的头部
                                .build();
                        return chain.proceed(request);
                    }
                }).build();
        return httpClient;
    }
}

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