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Android: Error deleting cookie whose name starts with "session"

See original GitHub issue

The problem

When I try to delete a cookie named session-id on Android, I get this exception:

An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not find :session section for url: /session2-id-longer-really-long-name (WARNING: The server did not provide any stacktrace information)

This happens for any cookie that starts with session, like session-id2 or session2-id. Cookies named session give a slightly different but similar error.

However, if I use driver.manage().deleteAllCookies(), the cookie is deleted without error.

Environment

Appium version (or git revision) that exhibits the issue: 1.8.1
Desktop OS/version used to run Appium: OS X Sierra
Mobile platform/version under test: Android 8.0
Real device or emulator/simulator: Emulator (although it happens on Sauce Labs and Browser Stack with real devices, too)
Appium CLI or Appium.app|exe: Appium.app

Details

If necessary, describe the problem you have been experiencing in more detail.

Link to Appium logs

This log is from when I ran it locally: https://gist.github.com/MicahLC/a058b3d07ba494c2912506b33e22f0eb

Code To Reproduce Issue [ Good To Have ]

https://github.com/MicahLC/android_session_cookie_bug

I had already created this repro case by the time I saw the instructions about the sample-code directory. Please let me know if this repro case isn’t usable and I’ll update it to use the sample-code.