[BUG] Can't send raw bytes

[madhavajay]

Description

I can't return bytes without getting an error that bytes can't be converted to PyString.
Digging into the code I think this is due to the struct Response using String instead of bytes.

Expected Behavior

Web servers should be able to return bytes.

Screenshots

Environment:

• Host OS:
• Browser:

---

[Optional] Additional Context

I figured i'd take a crack at it in a PR.

---