org.openqa.selenium.WebDriverException: cannot get automation extension

In our current project, we write CI tests using Selenium. But several weeks has passed since I wrote a new test and there goes a nice exception while running the old ones.

  
org.openqa.selenium.WebDriverException: unknown error: cannot get automation extension

Doesn't explain much, right?
I find the solution in upgrading my chrome driver.

test your http posts

Recently, I write an HTTP client for making post requests. Then I search for a way to test it. It's possible to write unit tests of course but that would be great if I see the real deal. Then I find 'Henry's HTTP Post Dumping Server'. Using his server you can easily test your post request and see its content.