Bug 1712080 - Gzip ping paylod before upload

[brizental]

Should I file a bug to document that pings are gzipped? I looked and that is not mentioned on the Glean book. That could be important for folks using custom uploaders for testing, but that could also be behaviour we want to disencourage... Even if we don't disencourage it, we might want to expose the WaitableHttpClient in the future. Then people still don't need to worry about gzipping.

Pull Request checklist

• Quality: Make sure this PR builds and runs cleanly.
  • Inside the glean/folder, run:
    • npm run test Runs all tests
    • npm run lint && npm run lint:circular-deps Runs all linters
• Tests: This PR includes thorough tests or an explanation of why it does not
• Changelog: This PR includes a changelog entry to CHANGELOG.md or an explanation of why it does not need one
• Documentation: This PR includes documentation changes, an explanation of why it does not need that or a follow-up bug has been filed to do that work
  • Documentation should be added to The Glean Book when making changes to Glean's user facing API
    • When changes to the Glean Book are necessary, link to the corresponding PR on the mozilla/glean repository
  • Documentation should be added to the Glean.js developer documentation when making internal code changes

[Dexterp37]

Would you kindly do, if you didn't already, a test with the debug view (before merging)?

[brizental]

Would you kindly do, if you didn't already, a test with the debug view (before merging)?

https://debug-ping-preview.firebaseapp.com/pings/gzipped-webext Did that while developing, ignore the failing one that was just development.