.NET、Maui、Android：使用 POST 获取 URI 的 Java 异常

问：

问题

我正在使用样板代码在 .NET Maui 应用程序中创建资源 （POST），并且在运行以下代码行时出现异常：

 HttpResponseMessage response = await httpClient.SendAsync(message);

例外情况如下：

Java.Lang.IllegalArgumentException：toASCII 输入无效：changed_for_privacy.com ---> Android.Icu.Text.StringPrepParseException：输入不符合 STD 3 ASCII 规则

变量是 POST 的 URI。在本例中，URI 当然具有 URL。我认为问题在于 URL 包含并下划线字符。例如，该消息如下所示：Message
https://my_site.com/proceed/to/endpoint

基于异常、堆栈跟踪（见下文）和一些谷歌搜索（请参阅本问题末尾的链接），我认为 Android 在处理 URL 中的下划线时遇到了问题。还有其他人也有类似的问题，但在过去的几年里我找不到任何东西。有针对该问题的解决方案，但它们要么不是 .NET，要么解决方案是“好吧，您不应该使用带有下划线的 URL”。

需要明确的是，URL 中有一个下划线，而不是 URI。

无论如何，“不使用带有下划线的 URL”不是我的选择。

我的代码

代码相当样板：

namespace my_project.Service;
internal class MyService
{
    private readonly HttpClient httpClient;
    public MyService()
    {
        httpClient = new();
    }

    public async Task GetAuthTokenPOST()
    {
        AccessTokenBodyPost accessTokenBodyModel = new()
        {
            grant_type = "password",
            username = "username"
        };

        try
        {
            HttpRequestMessage message = new(HttpMethod.Post, "https://changed_for_privacy.com/core/connect/token");
            message.Content = JsonContent.Create(accessTokenBodyModel);

            // EXCEPTION THROWN ON THIS LINE
            HttpResponseMessage response = await httpClient.SendAsync(message);
        }
        catch (Exception ex)
        {
            await ExitProgram.ErrorExitProgram();
        }
    }
}

编辑：URL中的下划线是问题所在

我设法让人们启动了一个全新的测试服务器，没有任何下划线......它有效。

我想教训是：避免在 URL 中使用下划线？

以下是堆栈跟踪的更多内容。（我不能发布整个东西 - 当我尝试时，Stack Overflow 一直给我一条错误消息 - 但如果有人想看到它，我会再试一次，即使它基本上只是我在下面重复发布的内容。

Java.Lang.IllegalArgumentException: Invalid input to toASCII: changed_for_privacy.com
 ---> Android.Icu.Text.StringPrepParseException: The input does not conform to the STD 3 ASCII rules

  --- End of managed Android.Icu.Text.StringPrepParseException stack trace ---
The input does not conform to the STD 3 ASCII rules. line:  0. preContext:  . postContext: 3_identity

    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(IDN.java:108)
    at javax.net.ssl.SNIHostName.<init>(SNIHostName.java:99)
    at com.android.org.conscrypt.Platform.getSSLParameters(Platform.java:187)
    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)

  --- End of managed Android.Icu.Text.StringPrepParseException stack trace ---
The input does not conform to the STD 3 ASCII rules. line:  0. preContext:  . postContext: 3_identity

    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(IDN.java:108)
    at javax.net.ssl.SNIHostName.<init>(SNIHostName.java:99)
    at com.android.org.conscrypt.Platform.getSSLParameters(Platform.java:187)
    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)

   --- End of inner exception stack trace ---
Java.Lang.IllegalArgumentException: Invalid input to toASCII: changed_for_privacy.com
 ---> Android.Icu.Text.StringPrepParseException: The input does not conform to the STD 3 ASCII rules

  --- End of managed Android.Icu.Text.StringPrepParseException stack trace ---
The input does not conform to the STD 3 ASCII rules. line:  0. preContext:  . postContext: 3_identity

    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(IDN.java:108)
    at javax.net.ssl.SNIHostName.<init>(SNIHostName.java:99)
    at com.android.org.conscrypt.Platform.getSSLParameters(Platform.java:187)
    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)

  --- End of managed Android.Icu.Text.StringPrepParseException stack trace ---
The input does not conform to the STD 3 ASCII rules. line:  0. preContext:  . postContext: 3_identity

    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(IDN.java:108)
    at javax.net.ssl.SNIHostName.<init>(SNIHostName.java:99)
    at com.android.org.conscrypt.Platform.getSSLParameters(Platform.java:187)
    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)

   --- End of inner exception stack trace ---

有谁知道这是什么和/或如何解决它？我已经尝试了涉及 httpClient 和“编码”的所有方法，或者使用 ASCII 字符而不是下划线。

在这里，我得到了一个问题，即问题出在URL中的下划线上。似乎人们曾经有过这个问题，但最近没有。

在这里，我得到的印象是这不是一个错误或错误，这只是世界的运作方式：如果你想使用Android，域中没有下划线。我想知道这是为什么？这让我最后两个月的工作变得毫无用处。按照字面。

请注意，该 URL 是可 ping 的，并且 POST 适用于 Postman。