Success/Error handling: Status Codes

[matthewhudson]

Use three simple, common response codes indicating (1) success, (2) failure due to client-side problem, (3) failure due to server-side problem:

• 200 - OK
• 400 - Bad Request
• 500 - Internal Server Error

[elimisteve]

Sounds good to me (except for the inability to provide messages as you guys mentioned in your JSON-RPC thread).

https://github.com/elimisteve/block-status-code-retriever follows this suggestion. Example: https://github.com/elimisteve/block-status-code-retriever/blob/master/web.go#L58