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Cypress fails testing link to Wiley Online Library

See original GitHub issue

Where to find the issue

https://www.coronawarn.app/en/blog/2021-08-05-statistictiles/ “Explanation of the statistic tiles in the Corona-Warn-App”
https://www.coronawarn.app/de/blog/2021-08-05-statistictiles/ “Erläuterung der Statistikkacheln in der Corona-Warn-App”

Describe the issue

The Cypress test check_links.js fails with an HTTP 503 error (Service Unavailable) when testing the link to https://onlinelibrary.wiley.com/doi/abs/10.2307/3315826.n1.

[RESPONSE 503] https://onlinelibrary.wiley.com/doi/abs/10.2307/3315826.n1 on 'http://localhost:8000/de/blog/2021-08-05-statistictiles' 
[RESPONSE 503] https://onlinelibrary.wiley.com/doi/abs/10.2307/3315826.n1 on 'http://localhost:8000/en/blog/2021-08-05-statistictiles'

The site https://onlinelibrary.wiley.com appears to be now using DDoS protection by Cloudflare. This is a new situation. Previously checks to this website were not causing an error response.

Steps to reproduce

Open a web browser and check that the link https://onlinelibrary.wiley.com/doi/abs/10.2307/3315826.n1 is available when accessed manually.

Execute npm run test:open In Cypress console select check_links.js to execute this test.

Note 2 failed tests and examine contents of log file cwa-website/cypress/logs/broken_links_result.txt

Suggested change

Options:

Ignore HTTP 503 (Service Unavailable) as a hard error. Instead, treat HTTP 503 as a temporary error and show success, or
Do not test https://onlinelibrary.wiley.com

Internal Tracking ID: EXPOSUREAPP-12411