Offchain worker (substrate)
Initial: Offchain Workers
https://github.com/paritytech/substrate/pull/1942
Implement HTTP request in offchain workers
https://github.com/paritytech/substrate/pull/3447
https://github.com/paritytech/substrate/pull/3461
Introduce capabilities filtering for off-chain runtime calls.
https://github.com/paritytech/substrate/pull/3454
Some tweaks to offchain HTTP workers
https://github.com/paritytech/substrate/pull/3488
wasm
Build WASM binaries as part of cargo build
https://github.com/paritytech/substrate/pull/2868