Unknown method
Theunknown method error is aWebDriver error that occurs when the driver does not recognize theHTTP request method used for the endpoint.
WebDriver provides a largely REST-ish API and not all endpoints in this API hasGET,POST, andDELETE methods. This error occurs when you try to call an endpoint with an HTTP request method it does not support.
Examples
The New Session command provides aPOST request endpoint which lets you create new WebDriver sessions:
bash
% curl -d '{}' http://localhost:4444/session{"sessionId":"d4605710-5a4e-4d64-a52a-778bb0c31e00","value":{"XULappId":"{ec8030f7-c20a-464f-9b0e-13a3a9e97384}","acceptSslCerts":false,"appBuildId":"20160913030425","browserName":"firefox","browserVersion":"51.0a1","command_id":1,"platform":"LINUX","platformName":"linux","platformVersion":"4.9.0-1-amd64","processId":17474,"proxy":{},"raisesAccessibilityExceptions":false,"rotatable":false,"specificationLevel":0,"takesElementScreenshot":true,"takesScreenshot":true,"version":"51.0a1"}}It also implements theDELETE method for ending a session:
bash
% curl -X DELETE http://localhost:4444/session/d4605710-5a4e-4d64-a52a-778bb0c31e00{}But it does not, for example, provide aGET method, and this will consequently return an unknown method error:
bash
% curl http://localhost:4444/session/650f9df3-740e-314c-958d-307e41752fae{"value":{"error":"unknown command","message":"GET /session/650f9df3-740e-314c-958d-307e41752fae did not match a known command","stacktrace":""}}%