如何解决调用 fcm.googleapis.com/fcm/send 时连接关闭
我正在从 Java 后端服务器向浏览器发送通知推送，最近我收到了很多 Connections Closed 异常。我使用Java Web Push library。
这个问题开始于 2020 年 12 月 23 日左右（从我的角度来看不是一个重要的日期，但也许有一些我不知道的更新......）
这是一个示例堆栈跟踪，我希望我能得到一些关于如何解决这个问题的想法。据我所知，如果注册无效或过期，我仍然会收到一个我可以做出反应的 HTTP 状态代码。连接关闭是意外，我不知道我拥有的记录是否有效。
我认为该错误不太可能与 Web Push 库有关。任何帮助将不胜感激。谢谢。
java.util.concurrent.ExecutionException: org.apache.http.ConnectionClosedException: Connection closed
at org.apache.http.concurrent.BasicFuture.getResult(BasicFuture.java:71)
at org.apache.http.concurrent.BasicFuture.get(BasicFuture.java:84)
at org.apache.http.impl.nio.client.FutureWrapper.get(FutureWrapper.java:70)
at nl.martijndwars.webpush.PushService.send(PushService.java:118)
at my.package.MyClass.sendNotification(MyClass.java:xx)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.http.ConnectionClosedException: Connection closed
at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.endOfInput(HttpAsyncRequestExecutor.java:347)
at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:261)
at org.apache.http.impl.nio.client.InternalIOdispatch.onInputReady(InternalIOdispatch.java:81)
at org.apache.http.impl.nio.client.InternalIOdispatch.onInputReady(InternalIOdispatch.java:39)
at org.apache.http.impl.nio.reactor.AbstractIOdispatch.inputReady(AbstractIOdispatch.java:121)
at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:162)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:337)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276)
at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:588)
... 1 more
Caused by:
org.apache.http.ConnectionClosedException: Connection closed
at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.endOfInput(HttpAsyncRequestExecutor.java:347)
at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:261)
at org.apache.http.impl.nio.client.InternalIOdispatch.onInputReady(InternalIOdispatch.java:81)
at org.apache.http.impl.nio.client.InternalIOdispatch.onInputReady(InternalIOdispatch.java:39)
at org.apache.http.impl.nio.reactor.AbstractIOdispatch.inputReady(AbstractIOdispatch.java:121)
at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:162)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:337)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315)
at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276)
at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:588)
at java.lang.Thread.run(Thread.java:748)
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