Android http 403 错误 可能出现的原因

今天自己写代码使用Retrofit下载百度搜索出来的图片的时候，发现了报错了，403。然后使用Glide却可以加载图片。

然后对Glide进行抓包，发现Glide请求的时候 http header 是这种格式的：

User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.81 Safari/537.36

而我自己的 请求默认是

User-Agent: okhttp/3.10.0

估计是百度对User-Agent有要求，所以我自己添加了一个正常的User-Agent请求头就ok了。

public class UserAgentInterceptor implements Interceptor {@Overridepublic Response intercept(Chain chain) throws IOException {Request request = chain.request().newBuilder().removeHeader("User-Agent")//移除旧的.addHeader("User-Agent", WebSettings.getDefaultUserAgent(MyApplication.getInstance()))//添加真正的头部,可以写死，也可以动态获取.build();return chain.proceed(request);}}

HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);if (mOkHttpClient == null) {synchronized (RetrofitClient.class) {if (mOkHttpClient == null) {//设置Http缓存//Cache cache = new Cache(new File(BilibiliApp.getInstance().getCacheDir(), "HttpCache"), 1024 * 1024 * 10);mOkHttpClient = new OkHttpClient.Builder()//.cache(cache).addInterceptor(interceptor).addInterceptor(new UserAgentInterceptor())//.addNetworkInterceptor(new CacheInterceptor())//.addNetworkInterceptor(new StethoInterceptor()).retryOnConnectionFailure(true).connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS).writeTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS).readTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS).cookieJar(new CookieManger(context))//.addInterceptor(new UserAgentInterceptor()).build();}}}