The current multipart XHR code doesn't work nicely with off-the-main-thread parsing. This is a problem with HTML now and will be a problem with XML in the future. If multipart responses aren't actually used, maybe we could drop multipart support. Let's gather data in order to make an informed decision.
Created attachment 582790 [details] [diff] [review] Add boolean telemetric for multipartness Do telemetry additions always require privacy review?
Comment on attachment 582790 [details] [diff] [review] Add boolean telemetric for multipartness I'm sure multipart is used extremely rarely.
this is clearly feature usage, removing privacy flags
Oops. Forgot to land this. Thanks for the reviews. https://hg.mozilla.org/integration/mozilla-inbound/rev/5fde420239cd