Support an option to enable/disable cache for each request

[yujiosaka]

What is the current behavior?

Caching is enabled by default.

It's ok for the most cases. However, especially for crawling purposes, we'd like to have content not from the cache but from the most fresh data.

If the current behavior is a bug, please provide the steps to reproduce

What is the expected behavior?

Support an option to enable/disable cache for each request, default to true

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Version:
• Platform / OS version:
• Node.js version: