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I'm trying to start a Chromium session using the chromedriver and w3c webdriver API, I send a POST request to
http://localhost:9515/session
with the body
"capabilities": {
"alwaysMatch": {
"platformName": "linux",
"chrome:browserOptions": {
"binary": "/usr/bin/chromium",
"args": ["--start-page=about:blank"]
"firstMatch": [
{"browserName": "chrome"}
And i get the next response
"sessionId": "b1a413df152017cd223dbabbcf1d2ffe",
"status": 33,
"value": {
"message": "session not created exception: Missing or invalid capabilities (Driver info: chromedriver=2.40.565383 (76257d1ab79276b2d53ee976b2c3e3b9f335cde7),platform=Linux 4.14.47-1-MANJARO x86_64)"
Which capabilities are missing or invalid?
chromedriver (as of version 2.41 at least) simply does not support the W3C WebDriver API.
The missing capability required by chromedriver is
capabilities.alwaysMatch.goog:chromeOptions.w3c: true
, i.e.
{ "capabilities" : { "alwaysMatch" : { "goog:chromeOptions" : { "w3c" : true } } } }
This is a deficiency in chromedriver. If you want to experiment with the W3C WebDriver protocol, you can use
geckodriver
(firefox), which has near-perfect support for the W3C WebDriver API.
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