在 URL 查询参数中使用某些字符时出现 Java 9 HttpClient 异常

Question

这是我的示例代码。查询编码为 UTF-8:

HttpRequest request = HttpRequest.newBuilder()
    .header("content-type", "application/json;charset=UTF-8")
    .uri(URI.create("http://localhost:8080/test?param1=test%C5%84"))
    .GET()
    .build();

HttpClient.newBuilder()
    .version(HttpClient.Version.HTTP_2)
    .build()
    .send(request, HttpResponse.BodyHandler.asString(Charset.forName("UTF-8")));

运行此示例后，出现以下异常:

java.lang.IllegalArgumentException: char=324
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Huffman.codeOf(Huffman.java:559)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Huffman.lengthOf(Huffman.java:524)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.StringWriter.configure(StringWriter.java:79)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.StringWriter.configure(StringWriter.java:62)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.IndexNameValueWriter.value(IndexNameValueWriter.java:64)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Encoder.literal(Encoder.java:422)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Encoder.header(Encoder.java:245)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Encoder.header(Encoder.java:198)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.encodeHeadersImpl(Http2Connection.java:927)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.encodeHeaders(Http2Connection.java:878)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.encodeHeaders(Http2Connection.java:951)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.sendFrame(Http2Connection.java:984)
at jdk.incubator.httpclient/jdk.incubator.http.Stream.sendHeadersAsync(Stream.java:547)
at jdk.incubator.httpclient/jdk.incubator.http.Exchange.lambda$responseAsyncImpl0$8(Exchange.java:322)
at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1072)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2073)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate.setALPN(SSLFlowDelegate.java:164)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate.access$200(SSLFlowDelegate.java:81)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate$Reader.processData(SSLFlowDelegate.java:340)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate$Reader$ReaderDownstreamPusher.run(SSLFlowDelegate.java:215)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$SynchronizedRestartableTask.run(SequentialScheduler.java:175)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:147)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$TryEndDeferredCompleter.complete(SequentialScheduler.java:315)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:198)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:271)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:224)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate$Reader.incoming(SSLFlowDelegate.java:242)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SubscriberWrapper.incomingCaller(SubscriberWrapper.java:388)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SubscriberWrapper.onNext(SubscriberWrapper.java:343)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SubscriberWrapper.onNext(SubscriberWrapper.java:58)
at jdk.incubator.httpclient/jdk.incubator.http.SocketTube$InternalReadPublisher$InternalReadSubscription.read(SocketTube.java:739)
at jdk.incubator.httpclient/jdk.incubator.http.SocketTube$SocketFlowTask.run(SocketTube.java:171)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:198)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:271)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:224)
at jdk.incubator.httpclient/jdk.incubator.http.SocketTube$InternalReadPublisher$InternalReadSubscription.signalReadable(SocketTube.java:675)
at jdk.incubator.httpclient/jdk.incubator.http.SocketTube$InternalReadPublisher$ReadEvent.signalEvent(SocketTube.java:829)
at jdk.incubator.httpclient/jdk.incubator.http.SocketTube$SocketFlowEvent.handle(SocketTube.java:243)
at jdk.incubator.httpclient/jdk.incubator.http.HttpClientImpl$SelectorManager.handleEvent(HttpClientImpl.java:769)
at jdk.incubator.httpclient/jdk.incubator.http.HttpClientImpl$SelectorManager.run(HttpClientImpl.java:731)

char=324表示已解码 ń来自查询

当我读取堆栈跟踪时，我发现了 jdk.incubator.http.Stream<T>类中的这个方法:

private void setPseudoHeaderFields() {
    HttpHeadersImpl hdrs = requestPseudoHeaders;
    String method = request.method();
    hdrs.setHeader(":method", method);
    URI uri = request.uri();
    hdrs.setHeader(":scheme", uri.getScheme());
    // TODO: userinfo deprecated. Needs to be removed
    hdrs.setHeader(":authority", uri.getAuthority());
    // TODO: ensure header names beginning with : not in user headers
    String query = uri.getQuery();
    String path = uri.getPath();
    if (path == null || path.isEmpty()) {
        if (method.equalsIgnoreCase("OPTIONS")) {
            path = "*";
        } else {
            path = "/";
        }
    }
    if (query != null) {
        path += "?" + query;
    }
    hdrs.setHeader(":path", path);
}

在这个方法中uri.getQuery()使用它为我们提供解码查询并导致上述异常。

当我使用 uri.getRawQuery() 时在 Debug模式下(它给了我们编码查询)一切正常。

我的问题是:这是错误还是有意使用？如果不是错误，如何避免异常？

Answer 1

这是一个错误:

java.lang.IllegalArgumentException with jdk.incubator.httpclient when using some UTF-8 characters

Some UTF-8 characters like "š" can't be used with HttpClient. However others like "å" can be.

参见:https://bugs.openjdk.java.net/browse/JDK-8201238

---

Java 9/10 HttpClient 孵化。它尚未投入生产。它在包名称中说明得非常清楚。因此，它很可能包含错误。

它将作为 currently scheduled for release 25th September 2018 的一部分在 Java 11 ( JEP 321) 中正确发布.