Refactor and more compliance

[saengowp]

Feature that I would like to have or that are requested:

Non-compliance

• Service URL is too strict (No use case)

Documentation

• Add documentation for newcomer (No need)

Feature

• User history (Last submit)
• Serverless support (via signing)
• Prefix URL (No use case)
• Flush console

Refactor

• Faster build time from layer caching
• String confusion
• Etc.