用 selendroid 模式测试 webview 是不是也需要 *** 呢？为什么我执行有时候是通过的，有时候 print driver.contexts 就会报错。
并且无法识别 webview 一直是 native？

报错信息如下：

info: --> GET /wd/hub/session/4dbdb598-2d69-2057-354b-e076f9137849/contexts {}
info: [debug] Getting a list of available webviews
info: [debug] executing: "D:\software\android-sdk-windows\platform-tools\adb.exe
" -s 0b2fd4c5 shell "cat /proc/net/unix"
info: [debug] Available contexts: undefined
info: [debug] []
info: [debug] Getting a list of available webviews
info: [debug] executing: "D:\software\android-sdk-windows\platform-tools\adb.exe
" -s 0b2fd4c5 shell "cat /proc/net/unix"
info: [debug] Available contexts: NATIVE_APP
info: [debug] []
info: [debug] Making http request with opts: {"url":"http://localhost:8080/wd/hu
b/session/4actu505-2d57-2057-1f8b-e054f9138459/title","method":"GET"}
info: [debug] Responding to client with error: {"status":13,"value":{"message":"
An unknown server-side error occurred while processing the command.","origValue"
:"Did not successfully proxy server command"},"sessionId":"4acd6701-2d77-6057-ff
9b-e076f9137849"}
info: <-- GET /wd/hub/session/4actu505-2d57-2057-1f8b-e054f9138459/title 500 98.
892 ms - 210