FAQ Links in app error messages point to wrong URLs

[tkowark]

Avoid duplicates

• Bug is not mentioned in the FAQ
• Bug is specific for Android only, for general issues / questions that apply to iOS and Android please raise them in the documentation repository
• Bug is not already reported in another issue -> Individual links reported, but not the general issue

Describe the bug

The following issues report on error messages in the app that link to FAQ entries:

• HTTP 404 for status 17 when Google COVID-19 exposure notifications unavailable #1043
• CAUSE: 3 Something went wrong. ApiException: 39508 #1021

Similar reports can be found in app store reviews for error 9002.

General problem is the link format of coronawarn.app/{lang}/faq/({error-code})

Expected behaviour

The app should use valid links to FAQs.

Steps to reproduce the issue

See linked issues for steps to recreate.

Technical details

• Mobile device: All devices
• Android version: 1.2+

Possible Fix

App-only: use the available links, e.g. https://coronawarn.app/de/faq/#API39508

App+Website:

• App: use generic links with hash instead of brackets https://coronawarn.app/{lang}/faq/#{error-code}
• Website: Ensure that a respective FAQ entry is available or redirect

Additional context

We've created a workaround (https://github.com/corona-warn-app/cwa-website/pull/296/files) on the website that takes the malformed links and redirects to specific FAQ entries. This, however, requires creation of dedicated html files per language as we cannot capture just any /(error-code) request (site is just static content on an S3 compatible object store). Using the proposed format in the app+website fix would allow us to handle this purely in javascript with a plain mapping object that we can adjust much more easily.

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Internal Tracking ID: EXPOSUREAPP-2261

[tkowark]

This will be fixed with #1074 and corona-warn-app/cwa-website#316