LIP-1 - Error handling

1. "Note: Additional information detailing all errors will be added." - I saw protocol & command errors do exist in reference implementation. Maybe they should be added to the document as well?
2. It is not clear from the description of how error handling should be handled at the HTTP level. Are protocol errors should be returned with 200OK?

Start by reading the LIP-1 error-handling text and comparing it with the reference implementation, focusing on protocol and command errors. The work is done when the document specifies those errors and clearly states the HTTP response behavior, including whether protocol errors use 200 OK.

Written by the indexing model from the issue text.