Server does not stop http client threads for closed sessions #9153

🐛 Bug Report

Server does not stop http client threads for closed sessions

To Reproduce

Start a standalone server, run a simple scenario that opens and closes sessions:

for (int i = 0; i < 60; i++) {
  WebDriver driver = new RemoteWebDriver(new ChromeOptions());
  driver.quit();
}

and watch the threads:

Environment

OS: Win10
Browser: any
Browser version: any
Browser Driver version: any
Language Bindings version: java
Selenium Grid version (if applicable): 4.0-alpha-7