feat: Compress uploads

[timfish]

Fixes #285

[jan-auer]

Thank you, @timfish! LGTM.

As a suggestion, you could only trigger compression if the body exceeds a certain size, since gzip also comes with a CPU penalty.

[timfish]

if the body exceeds a certain size

What would be a good threshold?

[jan-auer]

I did some quick research, and without explicit benchmarking the threshold is hard to determine. Most resources I found talk about a limit lower than 1k, which would be almost every outgoing request.

There is also https://medium.com/@joehonton/the-gzip-penalty-d31bd697f1a2, which seems to tip over at 32k. This gets me thinking: We probably don't need compression for regular event submission, and events are usually under 32k, so let's go with that?

[HazAT]

So if(request.body.length > 32000) zip else not zip?

[timfish]

Now with streams and gzip threshold!

[jan-auer]

Looks great, thanks for going the extra mile.

[GintV]

Any particular reason why this one is not merged yet?

[GintV]

Thanks for implementing this @timfish! @jan-auer, @HazAT any chance release could be made with this change?