FEATURE: Support uploading compressed json

[ehills]

Hi there,

If you uploaded compressed JSON from the ocap_exporter extension you could save yourself 90% or more data when POSTing to a webserver that supports it, i.e. apache.

Reasoning:

1. JSON is extremly compressable. It is mainly whitespace and repeated characters. A fantastic candidate
2. Apache and most other web servers readily accept compressed body data
3. Apache has a 2mb post body upload size by default.

[JamieGoodson]

On my todo list 🙂