Android 19 模拟器上的 API 调用：isConnected 失败：EHOSTUNREACH（无主机路由）

Question

我正在从 API 检索数据。当我尝试在运行 Android API 19 的 Android 模拟器上启动应用程序时，请求失败并出现以下错误。 使用其他版本的模拟器（如 Android API 27）可以正常工作。

我将 URL 更改为针对以前项目中的另一个 API，它可以正常工作。因此，问题似乎出在这个特定的 API 上，但我不明白为什么，尤其是当我将 URL 传递到模拟器的浏览器时，它工作正常。

我看到有人说这是计算机防火墙的问题，但我没有启用防火墙。

改造

interface SpaceXApi {
    @GET("rockets")
    fun getRockets(): Observable<MutableList<RocketDto>>
}

object SpaceXApiConstants {
    const val BASE_URL = "https://api.spacexdata.com/v3/"
}

// Interceptor passed to OkHttpClient Builder
class ConnectivityInterceptor(private val context: Context) : Interceptor {

    override fun intercept(chain: Interceptor.Chain): Response {
        if (isConnected()) {
            return chain.proceed(chain.request())
        } else {
            throw NoNetworkException()
        }
    }
}

错误

D/OkHttp: --> GET https://api.spacexdata.com/v3/rockets
D/OkHttp: <-- HTTP FAILED: java.net.ConnectException: Failed to connect to api.spacexdata.com/2606:4700:30::681f:5749:443
W/System.err: java.net.ConnectException: Failed to connect to api.spacexdata.com/2606:4700:30::681f:5749:443
        at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:247)
        at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:165)
        at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:257)
        at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
        at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
        at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.java:213)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at com.example.myproject.network.ConnectivityInterceptor.intercept(ConnectivityInterceptor.kt:13)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:200)
        at okhttp3.RealCall.execute(RealCall.java:77)
        at retrofit2.OkHttpCall.execute(OkHttpCall.java:180)
        at retrofit2.adapter.rxjava2.CallExecuteObservable.subscribeActual(CallExecuteObservable.java:42)
        at io.reactivex.Observable.subscribe(Observable.java:12090)
        at retrofit2.adapter.rxjava2.BodyObservable.subscribeActual(BodyObservable.java:34)
        at io.reactivex.Observable.subscribe(Observable.java:12090)
        at io.reactivex.internal.operators.observable.ObservableSubscribeOn$SubscribeTask.run(ObservableSubscribeOn.java:96)
        at io.reactivex.Scheduler$DisposeTask.run(Scheduler.java:578)
        at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:66)
        at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:57)
        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:841)
    Caused by: java.net.ConnectException: failed to connect to api.spacexdata.com/2606:4700:30::681f:5749 (port 443) after 20000ms: isConnected failed: EHOSTUNREACH (No route to host)
        at libcore.io.IoBridge.isConnected(IoBridge.java:223)
        at libcore.io.IoBridge.connectErrno(IoBridge.java:161)
12-02 17:44:40.445 4877-4877/com.example.myproject W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:112)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
        at java.net.Socket.connect(Socket.java:843)
        at okhttp3.internal.platform.AndroidPlatform.connectSocket(AndroidPlatform.java:73)
        at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:245)
        ... 38 more
    Caused by: libcore.io.ErrnoException: isConnected failed: EHOSTUNREACH (No route to host)
        at libcore.io.IoBridge.isConnected(IoBridge.java:208)
        ... 45 more

有什么办法吗？

Answer 1

看起来像协议问题：API 19 及更早版本的设备默认不使用 TLS 1.2。 您可以通过以下方式启用它：

ProviderInstaller.installIfNeededAsync(this, new ProviderInstaller.ProviderInstallListener() {
            @Override
            public void onProviderInstalled() {
            }
            @Override
            public void onProviderInstallFailed(int i, Intent intent) {
                Log.i(TAG, "Provider install failed (" + i + ") : SSL Problems may occurs");
            }
        });

这必须在您第一次调用之前调用，所以我通常在 Application 对象的 OnCreate 中调用它。

欲了解更多信息，您可以查看此链接：https://quizlet.com/blog/working-with-tls-1-2-on-android-4-4-and-lower