Many warnings about request stream confirmations when loading pages

[jdm]

For pages that make a bunch of network requests, if you look at the output of RUST_LOG=net::http_loader or RUST_LOG=net, you end up seeing a bunch of WARN - net::http_loader - Failed to receive confirmation request was streamed without error. The fact that everything appears to be working fine suggests that this is not actually a case we need to warn about. @gterzian What can we do to reduce the frequency of this message?

[gterzian]

Thanks for spotting this, it's actually an omission in the logic, which currently doesn't take into account a non-existent request body.