升级到 3.9 版后无法启动 Selenium IE 驱动程序

Question

从here 更新到 64 位 IEDriverServer 3.9 后，尝试使用 IE（版本：11.0.9600.17842，Win8.1）运行任何测试时出现以下异常。有谁知道如何解决这个问题，还是我应该降级回 3.8？

OpenQA.Selenium.WebDriverException : 响应为空的异常 向远程 WebDriver 服务器发送 HTTP 请求时抛出 网址http://localhost:53379/session。

异常的状态是 ReceiveFailure，消息是：底层连接是 关闭：接收时发生意外错误。 ---->

System.Net.WebException：底层连接已关闭：一个 接收时发生意外错误。 ----> System.IO.IOException ：无法从传输连接读取数据：现有 连接被远程主机强行关闭。 ----> System.Net.Sockets.SocketException ：现有连接是 被远程主机强行关闭 TearDown ： System.NullReferenceException：对象引用未设置为 对象的实例。

堆栈跟踪如下：

结果堆栈跟踪：在 OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo 请求信息）在 OpenQA.Selenium.Remote.HttpCommandExecutor.Execute（命令 commandToExecute) 在 OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute（命令 commandToExecute) 在 OpenQA.Selenium.Remote.RemoteWebDriver.Execute（字符串 driverCommandToExecute，Dictionary`2 参数）在 OpenQA.Selenium.Remote.RemoteWebDriver.StartSession（ICapabilities 所需能力）在 OpenQA.Selenium.Remote.RemoteWebDriver..ctor（ICommandExecutor commandExecutor，ICapabilities 期望能力）在 OpenQA.Selenium.IE.InternetExplorerDriver..ctor(InternetExplorerDriverService 服务，InternetExplorerOptions 选项）在 OpenQA.Selenium.IE.InternetExplorerDriver..ctor() --WebException at System.Net.HttpWebRequest.GetResponse() at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo 请求信息） --IOException at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) at System.Net.PooledStream.Read(Byte[] 缓冲区，Int32 偏移量，Int32 大小) 在 System.Net.Connection.SyncRead（HttpWebRequest 请求，布尔值 userRetrievedStream, Boolean probeRead) --SocketException at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) at System.Net.Sockets.NetworkStream.Read(Byte[] 缓冲区，Int32 偏移量， int32 大小）

Answer 1

将 IEDriverServer 3.9.0.0 用于来自http://selenium-release.storage.googleapis.com 的 Windows 64 位 我能够通过 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.<init>(InternetExplorerDriver.java:215)
    at org.openqa.selenium.ie.InternetExplorerDriver.<init>(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 进行的快速测试没有显示任何错误。 虽然 IEDriverServer_Win32_3.9.0 和 IEDriverServer_x64_3.9.0 已发布，但从未明确推送/发布在seleniumhq.org 页面的 Download 选项卡。

IEDriverServer.exe 的CHANGELOG 明确提到了以下免责声明：

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.

另外，IEDriverServer.exe v3.9.0.1 的CHANGELOG 提到了以下免责声明：

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.

解决方案

简单的解决方案是：

• 在 32 位和 64 位平台上使用 IEDriverServer_Win32_3.9.0。
• 恢复到 IEDriverServer_x64_3.8.0