c# - 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 : A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL http://localhost:53379/session.

The status of the exception was ReceiveFailure, and the message was: The underlying connection was closed: An unexpected error occurred on a receive. ---->

System.Net.WebException : The underlying connection was closed: An unexpected error occurred on a receive. ----> System.IO.IOException : Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ----> System.Net.Sockets.SocketException : An existing connection was forcibly closed by the remote host TearDown : System.NullReferenceException : Object reference not set to an instance of an object.

堆栈轨迹如下:

Result StackTrace: at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo requestInfo) at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute) at OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute) at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters) at OpenQA.Selenium.Remote.RemoteWebDriver.StartSession(ICapabilities desiredCapabilities) at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(ICommandExecutor commandExecutor, ICapabilities desiredCapabilities) at OpenQA.Selenium.IE.InternetExplorerDriver..ctor(InternetExplorerDriverService service, InternetExplorerOptions options) at OpenQA.Selenium.IE.InternetExplorerDriver..ctor() --WebException at System.Net.HttpWebRequest.GetResponse() at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo requestInfo) --IOException at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size) at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean 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[] buffer, Int32 offset, Int32 size)

Answer 1

为 Windows 64 位 使用 IEDriverServer 3.9.0.0 来自 http://selenium-release.storage.googleapis.com我能够使用 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.<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

尽管使用 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/发布以在Download seleniumhq.org 的选项卡页。

CHANGELOG IEDriverServer.exe 明确提及以下免责声明:

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，CHANGELOG IEDriverServer.exe v3.9.0.1 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