升级到版本3.9后无法启动Selenium IE Driver
从这里更新到IEDriverServer 3.9 for 64-bit后，我在尝试使用IE运行任何测试时遇到以下exception（版本：11.0.9600.17842，Win8.1）。 有谁知道怎么解决这个问题，还是应该降级到3.8？
OpenQA.Selenium.WebDriverException：抛出了一个带有null响应的exception，向URL http：// localhost：53379 / session发送HTTP请求到远程WebDriver服务器。
exception的状态是ReceiveFailure，消息是：基础连接已关闭：接收上发生意外错误。 —->
System.Net.WebException：基础连接已关闭：接收上发生意外错误。 —-> System.IO.IOException：无法从传输连接读取数据：远程主机强制关闭现有连接。 —-> System.Net.Sockets.SocketException：远程主机TearDown强制关闭现有连接：System.NullReferenceException：未将对象引用设置为对象的实例。
堆栈跟踪如下：
结果StackTrace：在OpenQA.Selenium的OpenQA.Selenium.Remium.DriverServiceCommandExecutor.Execute（Command commandToExecute）中的OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest（HttpRequestInfo requestInfo）中的OpenQA.Selenium.Remote.HttpCommandExecutor.Execute（命令commandToExecute）。在OpenQA.Selenium的OpenQA.Selenium.Remium.RemoteWebDriver..ctor（ICommandExecutor commandExecutor，ICapabilities desiredCapabilities）的OpenQA.Selenium.Remote.RemoteWebDriver.StartSession（ICapabilities desiredCapabilities）上的Remote.RemoteWebDriver.Execute（String driverCommandToExecute，Dictionary`2参数）位于OpenQA.Selenium.IE.InlennetExplorerDriver..ctor（）上的.IE.InternetExplorerDriver..ctor（InternetExplorerDriverService服务，InternetExplorerOptions选项）OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest中System.Net.HttpWebRequest.GetResponse（）的WebException （HttpRequestInfo requestInfo） – System.Net.Sockets.NetworkStream.Read上的–IOException（Byte []缓冲区，Int32偏移量， System32.Net.Connection.SyncRead上的System.Net.PooledStream.Read（Byte []缓冲区，Int32偏移量，Int32大小）的Int32大小）（HttpWebRequest请求，Boolean userRetrievedStream，Boolean probeRead） – System.Net.Sockets上的SocketException System.SNet.Sockets.NetworkStream.Read（Byte []缓冲区，Int32偏移量，Int32大小）的.Socket.Receive（Byte []缓冲区，Int32偏移量，Int32大小，SocketFlags socketFlags）
从http://selenium-release.storage.googleapis.com使用IEDriverServer 3.9.0.0 for Windows 64位我可以使用IEDriverServer_x64_3.9.0重现该问题。
错误堆栈跟踪：
Started InternetExplorerDriver server (64-bit) 3.9.0.0 Listening on port 28286 Only local connections are allowed Exception in thread "main" org.openqa.selenium.WebDriverException: java.net.ConnectException: Failed to connect to localhost/0:0:0:0:0:0:0:1:28286 Build info: version: '3.9.1', revision: '63f7b50', time: '2018-02-07T22:42:28.403Z' System info: host: 'ATECHM-03', ip: '192.168.1.35', os.name: 'Windows 8', os.arch: 'amd64', os.version: '6.2', java.version: '1.8.0_144' Driver info: driver.version: InternetExplorerDriver at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:92) at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:601) at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:219) at org.openqa.selenium.ie.InternetExplorerDriver.run(InternetExplorerDriver.java:223) at org.openqa.selenium.ie.InternetExplorerDriver.(InternetExplorerDriver.java:215) at org.openqa.selenium.ie.InternetExplorerDriver. (InternetExplorerDriver.java:152) at demo.A_IE_simple.main(A_IE_simple.java:13) Caused by: java.net.ConnectException: Failed to connect to localhost/0:0:0:0:0:0:0:1:28286 at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:240) at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:158) at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:256) at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:134) at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:113) at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:125) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:200) at okhttp3.RealCall.execute(RealCall.java:77) at org.openqa.selenium.remote.internal.OkHttpClient.execute(OkHttpClient.java:104) at org.openqa.selenium.remote.internal.OkHttpClient.execute(OkHttpClient.java:54) at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:101) at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:73) at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:138) at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83) ... 6 more Caused by: java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at okhttp3.internal.platform.Platform.connectSocket(Platform.java:125) at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:238) ... 29 more
虽然使用IEDriverServer_Win32_3.9.0进行快速测试但未显示任何错误。 虽然IEDriverServer_Win32_3.9.0和IEDriverServer_x64_3.9.0已经建立，但从未明确推送 / 发布到seleniumhq.org页面的“ 下载”选项卡上。
IEDriverServer.exe的CHANGELOG明确提到以下免责声明：
The "major" and "minor" fields are synchronized to releases of the Selenium project. Changes in the "build" field indicate interim releases made publicly available via the project downloads page. Changes in "revision" field indicate private releases checked into the prebuilts directory of the source tree, but not made generally available on the downloads page.
此外， IEDriverServer.exe v3.9.0.1的 CHANGELOG提到以下免责声明：
Finally, there is every chance that, despite all efforts to the contrary, it's possible that there are new regressions introduced by this change. Multiple test suites have been run using this change, and none have failed thus far due to the changes herein. Claims that this change is causing a specific failure should be accompanied by a full test case, or issues reported against this change will be summarily closed.
解
简单的解决方案是：
- 在32位和64位平台上使用IEDriverServer_Win32_3.9.0 。
- 恢复为IEDriverServer_x64_3.8.0