What do these changes do?

Currently in my client, I'm generating a headers dictionary that is used for all websockets connections. What I found is that when ws_connect is called, the websocket key is added to this dict, which is then passed back on the next call to ws_connect. Since the default headers don't overwrite the headers dict, the stale secret key is sent to the server, and the connection fails.

This change forces the secret key to overwrite the existing headers, since it is (and should) be regenerated for each connection. We might also want to consider copying the incoming dict before making changes, but that's another issue.

Are there changes in behavior for the user?

No

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new entry to CHANGES.rst
  • Choose any open position to avoid merge conflicts with other PRs.
  • Add a link to the issue you are fixing (if any) using #issue_number format at the end of changelog message. Use Pull Request number if there are no issues for PR or PR covers the issue only partially.