Unknown Command is not sending correct error

[titusfortner]

As part of testing the new shadow root endpoints, I'm running on Firefox and I'm not getting the error I'm expecting.

If the command has not been defined, then I expect to get a 404 response with a "text/json" payload with error value of "unknown command"

Instead I'm getting a 405 response with a "text/plain" payload, body: "HTTP method not allowed"

There's nothing in the Marionette logs:

2021-11-21 23:11:48 INFO Selenium -> POST session/97e180da-b667-9f4c-ac37-e5e980e48002/element
2021-11-21 23:11:48 INFO Selenium    >>> http://127.0.0.1:4444/session/97e180da-b667-9f4c-ac37-e5e980e48002/element | {"using":"xpath","value":".//*[local-name()='div'][@id='shadow_host']"}
2021-11-21 23:11:48 DEBUG Selenium      > {"Accept"=>"application/json", "Content-Type"=>"application/json; charset=UTF-8", "User-Agent"=>"selenium/4.0.2 (ruby macosx)", "Content-Length"=>"71"}
1637557908720   webdriver::server   DEBUG   -> POST /session/97e180da-b667-9f4c-ac37-e5e980e48002/element {"using":"xpath","value":".//*[local-name()='div'][@id='shadow_host']"}
1637557908723   Marionette  DEBUG   0 -> [0,3,"WebDriver:FindElement",{"using":"xpath","value":".//*[local-name()='div'][@id='shadow_host']"}]
1637557908727   Marionette  TRACE   [24] MarionetteCommands actor created for window id 4294967298
1637557908732   Marionette  DEBUG   0 <- [1,3,null,{"value":{"element-6066-11e4-a52e-4f735466cecf":"7627655a-bf31-6249-8cfe-b8971cdde149"}}]
1637557908732   webdriver::server   DEBUG   <- 200 OK {"value":{"element-6066-11e4-a52e-4f735466cecf":"7627655a-bf31-6249-8cfe-b8971cdde149"}}
2021-11-21 23:11:48 INFO Selenium <- {"value":{"element-6066-11e4-a52e-4f735466cecf":"7627655a-bf31-6249-8cfe-b8971cdde149"}}
2021-11-21 23:11:48 INFO Selenium -> GET session/97e180da-b667-9f4c-ac37-e5e980e48002/element/7627655a-bf31-6249-8cfe-b8971cdde149/shadow
2021-11-21 23:11:48 INFO Selenium <- HTTP method not allowed

Selenium::WebDriver::Error::WebDriverError: unexpected response, code=405, content-type="text/plain"
HTTP method not allowed

Fwiw, Safari is returning what I expect to see:

2021-11-21 23:30:52 INFO Selenium <- {"value":{"error":"unknown command","message":"The command 'GET \/session\/215CED6A-189A-4642-978E-47C958DCE530\/element\/node-8C118294-BDD3-4A9C-B94E-DEC393302060\/shadow' was not found.","stacktrace":""}}

[whimboo]

Thanks @titusfortner! We will cover that scenario via https://bugzilla.mozilla.org/show_bug.cgi?id=1742357

[GCuser99]

This still seems not to be fixed as of v33. Getting 405 response with a "text/plain" payload, body: "HTTP method not allowed" for Geckodriver when I use a mis-specified command path...

[whimboo]

Right, and that's the reason why this issue is still open. Also there is no easy fix for that. You can find more details in the above referenced bug.