ExoPlayer播放指定MP3流失败，求解析IllegalArgumentException错误

问题背景 #

使用ExoPlayer播放MP3流链接 https://go_fm.streampartner.nl/live?type=.mp3 时，出现流加载失败的异常。

错误核心原因 #

从错误日志的根异常可以定位问题：

java.lang.IllegalArgumentException: toASCII输入无效：go_fm.streampartner.nl
Caused by: 输入不符合STD 3 ASCII规则。line:  0. preContext:  . postContext: o_fm

问题出在域名 go_fm.streampartner.nl 中的下划线 _。根据**STD 3 ASCII（RFC 1123）**规范，域名的每个标签（点分隔的部分）只能包含字母、数字和连字符 -，下划线 _ 属于非法字符。

Android系统的IDN.toASCII方法会严格验证域名格式，当建立TLS连接时，SNI（Server Name Indication）需要将域名转换为ASCII格式，此时非法的下划线会触发验证失败，导致TLS连接无法建立，最终ExoPlayer加载流时抛出异常。

解决方案 #

1. 更换合法域名（推荐） #

联系流服务提供商，将包含下划线的域名修改为符合RFC 1123规范的域名，例如将 go_fm 改为 go-fm。

2. 自定义HttpDataSource绕过验证（临时方案） #

如果无法更换域名，可以自定义ExoPlayer的HttpDataSource，修改域名处理逻辑或禁用SNI验证。示例代码如下：

// 自定义OkHttpClient，跳过SNI的严格域名验证
OkHttpClient okHttpClient = new OkHttpClient.Builder()
    .sslSocketFactory(new SSLSocketFactory() {
        @Override
        public Socket createSocket(Socket socket, String host, int port, boolean autoClose) throws IOException {
            // 忽略原host的下划线问题，直接使用socket连接
            return socket;
        }

        @Override
        public String[] getDefaultCipherSuites() {
            return new String[0];
        }

        @Override
        public String[] getSupportedCipherSuites() {
            return new String[0];
        }

        @Override
        public Socket createSocket() throws IOException {
            return new Socket();
        }
    }, (X509TrustManager) TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm()).getTrustManagers()[0])
    .build();

// 配置ExoPlayer使用自定义的HttpDataSource
DefaultHttpDataSource.Factory dataSourceFactory = new DefaultHttpDataSource.Factory()
    .setOkHttpClient(okHttpClient);

// 初始化ExoPlayer时使用该dataSourceFactory
ExoPlayer player = new ExoPlayer.Builder(context)
    .setMediaSourceFactory(new DefaultMediaSourceFactory(dataSourceFactory))
    .build();

注意：该方案会降低TLS连接的安全性，仅作为临时替代方案使用。

完整错误日志 #

2024-04-16 17:16:03.298  8130-8228  LoadTask                com.familiekoning.radionedplus       E  加载流时出现意外异常
java.lang.IllegalArgumentException: toASCII输入无效：go_fm.streampartner.nl
at java.net.IDN.toASCII(IDN.java:115)
at javax.net.ssl.SNIHostName.(SNIHostName.java:99)
at com.android.org.conscrypt.Platform.getSSLParameters(Platform.java:192)
at com.android.org.conscrypt.ConscryptEngine.getSSLParameters(ConscryptEngine.java:525)
at com.android.org.conscrypt.ConscryptEngineSocket.getSSLParameters(ConscryptEngineSocket.java:186)
at com.android.okhttp.internal.Platform.configureTlsExtensions(Platform.java:121)
at com.android.okhttp.internal.io.RealConnection.connectTls(RealConnection.java:191)
at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:153)
at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:116)
at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:186)
at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:131)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:90)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:30)
at androidx.media3.datasource.DefaultHttpDataSource.makeConnection(DefaultHttpDataSource.java:678)
at androidx.media3.datasource.DefaultHttpDataSource.makeConnection(DefaultHttpDataSource.java:575)
at androidx.media3.datasource.DefaultHttpDataSource.open(DefaultHttpDataSource.java:399)
at androidx.media3.datasource.DefaultDataSource.open(DefaultDataSource.java:275)
at androidx.media3.datasource.StatsDataSource.open(StatsDataSource.java:86)
at androidx.media3.exoplayer.source.ProgressiveMediaPeriod$ExtractingLoadable.load(ProgressiveMediaPeriod.java:1029)
at androidx.media3.exoplayer.upstream.Loader$LoadTask.run(Loader.java:421)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
at java.lang.Thread.run(Thread.java:1012)
Caused by: 输入不符合STD 3 ASCII规则。line:  0. preContext:  . postContext: o_fm
at android.icu.impl.IDNA2003.convertToASCII(IDNA2003.java:218)
at android.icu.impl.IDNA2003.convertIDNToASCII(IDNA2003.java:276)
at android.icu.text.IDNA.convertIDNToASCII(IDNA.java:654)
at com.android.icu.text.ExtendedIDNA.convertIDNToASCII(ExtendedIDNA.java:50)
at java.net.IDN.toASCII(IDNA.java:108)
... 27 more
2024-04-16 17:16:03.322  8130-8168  ExoPlayerImplInternal   com.familiekoning.radionedplus       E  播放错误
androidx.media3.exoplayer.ExoPlaybackException: 源错误
at androidx.media3.exoplayer.ExoPlayerImplInternal.handleIoException(ExoPlayerImplInternal.java:717)
at androidx.media3.exoplayer.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:693)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loopOnce(Looper.java:205)
at android.os.Looper.loop(Looper.java:294)
at android.os.HandlerThread.run(HandlerThread.java:67)
Caused by: androidx.media3.exoplayer.upstream.Loader$UnexpectedLoaderException: Unexpected IllegalArgumentException: Invalid input to toASCII: go_fm.streampartner.nl
at androidx.media3.exoplayer.upstream.Loader$LoadTask.run(Loader.java:442)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
at java.lang.Thread.run(Thread.java:1012)
Caused by: java.lang.IllegalArgumentException: Invalid input to toASCII: go_fm.streampartner.nl
at java.net.IDN.toASCII(IDN.java:115)
at javax.net.ssl.SNIHostName.(SNIHostName.java:99)
at com.android.org.conscrypt.Platform.getSSLParameters(Platform.java:192)
at com.android.org.conscrypt.ConscryptEngine.getSSLParameters(ConscryptEngine.java:525)
at com.android.org.conscrypt.ConscryptEngineSocket.getSSLParameters(ConscryptEngineSocket.java:186)
at com.android.okhttp.internal.Platform.configureTlsExtensions(Platform.java:121)
at com.android.okhttp.internal.io.RealConnection.connectTls(RealConnection.java:191)
at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:153)
at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:116)
at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:186)
at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:131)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:90)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:30)
at androidx.media3.datasource.DefaultHttpDataSource.makeConnection(DefaultHttpDataSource.java:678)
at androidx.media3.datasource.DefaultHttpDataSource.makeConnection(DefaultHttpDataSource.java:575)
at androidx.media3.datasource.DefaultHttpDataSource.open(DefaultHttpDataSource.java:399)
at androidx.media3.datasource.DefaultDataSource.open(DefaultDataSource.java:275)
at androidx.media3.datasource.StatsDataSource.open(StatsDataSource.java:86)
at androidx.media3.exoplayer.source.ProgressiveMediaPeriod$ExtractingLoadable.load(ProgressiveMediaPeriod.java:1029)
at androidx.media3.exoplayer.upstream.Loader$LoadTask.run(Loader.java:421)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
at java.lang.Thread.run(Thread.java:1012)
Caused by: 输入不符合STD 3 ASCII规则。line:  0. preContext:  . postContext: o_fm

at android.icu.impl.IDNA2003.convertToASCII(IDNA2003.java:218)
at android.icu.impl.IDNA2003.convertIDNToASCII(IDNA2003.java:276)
at android.icu.text.IDNA.convertIDNToASCII(IDNA.java:654)
at com.android.icu.text.ExtendedIDNA.convertIDNToASCII(ExtendedIDNA.java:50)
at java.net.IDN.toASCII(IDNA.java:108)

内容的提问来源于stack exchange，提问作者Patrick Koning