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[英]Okhttp Unable to connect to a localhost endpoint throws Connected failed: ECONNREFUSED (Connection refused)
[英]Connection refused when connecting to localhost's port 9999
我正在尝试理解一些示例 Kotlin 使用 sockets 连接到http://127.0.0.1
的代码,并且我启用了 IIS 并在 127.0.0.1 上运行它。 但是,当我运行代码时,我得到:
"C:\Program Files\Microsoft\jdk-11.0.12.7-hotspot\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:52769,suspend=y,server=n -javaagent:C:/Users/ivlat/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core-jvm/1.5.0/d8cebccdcddd029022aa8646a5a953ff88b13ac8/kotlinx-coroutines-core-jvm-1.5.0.jar -javaagent:C:\Users\ivlat\AppData\Local\JetBrains\IdeaIC2022.2\captureAgent\debugger-agent.jar=file:/C:/Users/ivlat/AppData/Local/Temp/capture.props -Dfile.encoding=UTF-8 -classpath "C:\Dev\KotlinProjects\7_08_Echo\client\build\classes\kotlin\main;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-jdk8\1.5.21\6b3de2a43405a65502728047db37a98a0c7e72f0\kotlin-stdlib-jdk8-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-classic\1.2.3\7c4f3c474fb2c041d8028740440937705ebb473a\logback-classic-1.2.3.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-core\1.2.3\864344400c3d4d92dfeb0a305dc87d953677c03c\logback-core-1.2.3.jar;C:\Dev\KotlinProjects\7_08_Echo\shared\build\classes\kotlin\main;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-coroutines-core-jvm\1.5.0\d8cebccdcddd029022aa8646a5a953ff88b13ac8\kotlinx-coroutines-core-jvm-1.5.0.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-jdk7\1.5.21\f059658740a4b3a3461aba9681457615332bae1c\kotlin-stdlib-jdk7-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib\1.5.21\2f537cad7e9eeb9da73738c8812e1e4cf9b62e4e\kotlin-stdlib-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.slf4j\slf4j-api\1.7.25\da76ca59f6a57ee3102f8f9bd9cee742973efa8a\slf4j-api-1.7.25.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-common\1.5.21\cc8bf3586fd2ebcf234058b9440bb406e62dfacb\kotlin-stdlib-common-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains\annotations\13.0\919f0dfe192fb4e063e7dacadee7f8bb9a2672a9\annotations-13.0.jar;C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2022.2.3\lib\idea_rt.jar" com.knowledgespike.client.ApplicationKt
Connected to the target VM, address: '127.0.0.1:52769', transport: 'socket'
Exception in thread "main" java.io.IOException: The remote computer refused the network connection.
at java.base/sun.nio.ch.Iocp.translateErrorToIOException(Iocp.java:299)
at java.base/sun.nio.ch.Iocp$EventHandlerTask.run(Iocp.java:389)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Disconnected from the target VM, address: '127.0.0.1:52769', transport: 'socket'
Process finished with exit code 1
显然,我的 IIS 并没有真正设置端口 9999,因为当我键入localhost/127.0.0.1:9999
时出现以下错误
HTTP Error 404.0 - Not Found
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.
Kotlin 代码也使用的连接字符串是localhost/127.0.0.1:9999
我 go 如何让 IIS 识别这个请求/让它通过? 它甚至不必是 IIS。我只是想更好地理解此示例代码,此时允许此请求的任何类型的沙箱/测试 web 服务器都绰绰有余。
这是在尝试连接时抛出异常的 Kotlin 代码:
fun main() = runBlocking {
val client: AsynchronousSocketChannel = AsynchronousSocketChannel.open()
val hostAddress = InetSocketAddress("localhost", PORT)
val tcpSocket = TcpSocket(client)
tcpSocket.connect(hostAddress)
val br = BufferedReader(InputStreamReader(System.`in`))
var line: String
println("Main name is: \t\t\t\t\t${Thread.currentThread().name}")
println("Message to server:")
while (br.readLine().also { line = it } != null) {
val result = async {
println("while:async name is: \t\t\t${Thread.currentThread().name}")
sendMessage(tcpSocket, line)
}
println("while: name is: \t\t\t\t${Thread.currentThread().name}")
if (line == "bye") {
println("End")
break
}
val response: String = result.await()
withContext(Dispatchers.Default) {
println("withContext[Default] name is: \t${Thread.currentThread().name}")
println("response from server: $response")
println("Message to server:")
}
}
}
通过转到 IIS 管理器 UI 中的默认 web 站点的绑定,然后添加端口 9999,我能够规避该错误。Kotlin 代码现在连接正常。 我很确定有更好的方法来解决这个 IRL,但我认为这已经足够了,因为我现在正在学习 Kotlin。
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