Mixed content causes a queued item to remain pending indefinitely

Created by: cameronbraid

What is the current behavior?

When a HTTPS url is crawled that contains mixed content (e.g. http iframe tag) the crawler never calls onSuccess callback or emits requestfinished or onError callback or emits requestfailed and pendingQueueSize never returns to 0

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

Crawl a HTTPS page that includes a http image or iframe tag

What is the expected behavior?

Good question... I would expect that the onError callback and requestfailed event is emitted

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

The crawl never ends and there is no notiifcation as to why

Please tell us about your environment:

• Version: 1.7.0
• Platform / OS version: linux
• Node.js version: v8.11.2