Add tests for HTTP fields #491

Job	Run time
Build Rust tests (ubuntu-latest)	53s
Build Rust tests (macos-latest)	1m 10s
Build Rust tests (windows-11-arm)	1m 28s
Build Assemblyscript tests (windows-latest)	1m 10s
Build C tests (windows-latest)	31s
Build Rust tests (windows-latest)	1m 54s
Build Assemblyscript tests (ubuntu-latest)	20s
Build C tests (ubuntu-latest)	10s
Build Assemblyscript tests (macos-latest)	15s
Build Assemblyscript tests (windows-11-arm)	36s
Build C tests (macos-latest)	10s
Build C tests (windows-11-arm)	1m 2s
Run tests (windows-11-arm, wasmtime)	47s
Run tests (windows-latest, wasmtime)	45s
Run tests (ubuntu-latest, wasmtime)	29s
Run tests (macos-latest, wasmtime)	28s
upload_test_binaries	0s
	12m 8s

Provide feedback