via3 error when attempting to load https://www.arrow.com/en/research-and-events/articles/fpga-mining

**Describe the bug**
LMS app user reported the following error page when creating an assignment at https://www.arrow.com/en/research-and-events/articles/fpga-mining
`UpstreamServiceError: HTTPSConnectionPool(host='www.arrow.com', port=443): Read timed out. (read timeout=10)`

`URL: https://via3.hypothes.is/route?url=https%3A%2F%2Fwww.arrow.com%2Fen%2Fresearch-and-events%2Farticles%2Ffpga-mining&via.client.openSidebar=1&via.client.requestConfigFromFrame.origin=https%3A%2F%2Flms.hypothes.is&via.client.requestConfigFromFrame.ancestorLevel=2&via.external_link_mode=new-tab`

`Third party URL: https://www.arrow.com/en/research-and-events/articles/fpga-mining`

**To Reproduce**
Steps to reproduce the behavior:
1. Go to https://via3.hypothes.is
2. Enter `https://www.arrow.com/en/research-and-events/articles/fpga-mining` for the URL
3. See error

OR

1. Go to https://via3.hypothes.is/route?url=https%3A%2F%2Fwww.arrow.com%2Fen%2Fresearch-and-events%2Farticles%2Ffpga-mining
2. See error

**Expected behavior**
via3 should proxy the page successfully.

**Screenshots**

**Desktop (please complete the following information):**
- OS: MacOS 10.15.7
- Browser: Chrome & Firefox
- Versions: 86(chrome) & 82(ff)

Start by reproducing the failure through the via3.hypothes.is route with the listed Arrow URL and inspect the timeout response. Trace the route's handling of the third-party URL; done means the page proxies successfully without the reported UpstreamServiceError.

Written by the indexing model from the issue text.