Chrome Version       : 66.0.3359.81
OS Version: OS X 10.13.3
URLs (if applicable) : any ws:///
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari: does not offer request blocking as a dev feature
    Firefox: does not offer request blocking as a dev feature
    IE/Edge: no idea

What steps will reproduce the problem?
1. open a page that opens a websocket connection
2. add the relevant ws url to the request blocking dev tool
3. reload the page

What is the expected result?
The request is blocked

What happens instead of that?
The request happily goes on like nothing happened


Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.81 Safari/537.36