Calling browser.clearLocalStorage() results in error

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Environment (please complete the following information):

• WebdriverIO version: 6.1.12
• Mode: WDIO Testrunner
• If WDIO Testrunner, running sync/async: sync
• Node.js version: 10.20.1
• NPM version: 6.14.4
• Browser name and version: Safari 12.1
• Platform name and version: iOS 12.1
• Additional wdio packages used (if applicable): “@wdio/appium-service”: “^6.1.0”, “@wdio/cli”: “^6.1.11”, “@wdio/jasmine-framework”: “^6.1.8”, “@wdio/junit-reporter”: “^6.1.9”, “@wdio/local-runner”: “^6.1.11”, “@wdio/spec-reporter”: “^6.1.9”, “@wdio/sync”: “^6.1.8”,

Config of WebdriverIO N/A

Describe the bug Executing browser.clearLocalStorage() in webview context results in an error:

ERROR webdriver: Request failed with status 500 due to unknown error: An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 400 - undefined

To Reproduce Start test on iOS device, switch to webview context and try browser.clearLocalStorage()

[0-0] › driver.switchContext('WEBVIEW_XXXX.X')
[0-0] 2020-06-26T07:42:49.266Z INFO webdriver: COMMAND switchContext("WEBVIEW_XXXX.X")
[0-0] 2020-06-26T07:42:49.269Z INFO webdriver: [POST] http://localhost:4723/session/ab4bbe39-4ec2-4e4e-b609-04da018b7e23/context
[0-0] 2020-06-26T07:42:49.269Z INFO webdriver: DATA { name: 'WEBVIEW_XXXX.X' }
null
[0-0] › driver.clearLocalStorage();

Expected behavior Expected local storage to be empty and command not to raise an error

Log

[0-0] › driver.getContext() # Check current context is webview
[0-0] 2020-06-26T07:42:30.816Z INFO webdriver: COMMAND getContext()
[0-0] 2020-06-26T07:42:30.817Z INFO webdriver: [GET] http://localhost:4723/session/ab4bbe39-4ec2-4e4e-b609-04da018b7e23/context
[0-0] 2020-06-26T07:42:30.820Z INFO webdriver: RESULT WEBVIEW_XXXX.X
'WEBVIEW_XXXX.X'
[0-0] › driver.clearLocalStorage();
[0-0] 2020-06-26T07:42:53.539Z INFO webdriver: COMMAND clearLocalStorage()
[0-0] 2020-06-26T07:42:53.539Z INFO webdriver: [DELETE] http://localhost:4723/session/ab4bbe39-4ec2-4e4e-b609-04da018b7e23/local_storage
[0-0] 2020-06-26T07:42:53.554Z DEBUG webdriver: request failed due to response error: unknown error
[0-0] 2020-06-26T07:42:53.554Z INFO webdriver: Retrying 1/3
2020-06-26T07:42:53.554Z INFO webdriver: [DELETE] http://localhost:4723/session/ab4bbe39-4ec2-4e4e-b609-04da018b7e23/local_storage
[0-0] 2020-06-26T07:42:53.554Z WARN webdriver: Request failed with status 500 due to An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 400 - undefined
[0-0] 2020-06-26T07:42:53.568Z DEBUG webdriver: request failed due to response error: unknown error
[0-0] 2020-06-26T07:42:53.569Z INFO webdriver: Retrying 2/3
2020-06-26T07:42:53.569Z INFO webdriver: [DELETE] http://localhost:4723/session/ab4bbe39-4ec2-4e4e-b609-04da018b7e23/local_storage
[0-0] 2020-06-26T07:42:53.569Z WARN webdriver: Request failed with status 500 due to An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 400 - undefined
[0-0] 2020-06-26T07:42:53.584Z DEBUG webdriver: request failed due to response error: unknown error
[0-0] 2020-06-26T07:42:53.584Z INFO webdriver: Retrying 3/3
2020-06-26T07:42:53.585Z INFO webdriver: [DELETE] http://localhost:4723/session/ab4bbe39-4ec2-4e4e-b609-04da018b7e23/local_storage
[0-0] 2020-06-26T07:42:53.584Z WARN webdriver: Request failed with status 500 due to An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 400 - undefined
[0-0] 2020-06-26T07:42:53.598Z DEBUG webdriver: request failed due to response error: unknown error
[0-0] 2020-06-26T07:42:53.599Z ERROR webdriver: Request failed with status 500 due to unknown error: An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 400 - undefined
Thrown:
/Users/user.name/Projects/ft-app/node_modules/@wdio/sync/build/wrapCommand.js:76
      throw e;
      ^

unknown error: An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 400 - undefined
    at evalmachine.<anonymous>:1:8
    at Script.runInContext (vm.js:133:20)
    at Object.runInContext (vm.js:311:6)
    at WDIORepl._runCmd (/Users/user.name/Projects/project/node_modules/@wdio/repl/build/index.js:54:34)
    at /Users/user.name/Projects/user.name/node_modules/@wdio/repl/build/index.js:46:57

[wswebcreation]

@raditotev

This looks like a 3rd-party issue with Appium not with WDIO. Which version of Appium are you using?

The workaround would be to inject a script with something like this

//clears everything in localStorage
browser.execute('localStorage.clear()')

//removes only the specific property "test123"
browser.execute('localStorage.clear("localStorage.removeItem(\"test123\")")')

[raditotev]

Thank you both 👍