Steps to replicate the issue (include links if applicable):

• Receive email including URL of extant Wikipedia article https://en.wikipedia.org/wiki/Mail_Boxes_Etc. (note closing period)
• Open email on Android device, which has the Wikipedia app installed
• App rightly attempts to open link

[Needs to be tested also for other punctuation characters]

What happens?:

• 404 error is displayed:

Code 404: https://en.wikipedia.org/api/rest_v1/page/summary/Mail_Boxes_Etc, title: Not found, detail: Page or revision not found.

(note absence of period in URL in error message)

What should have happened instead?:

• Link should open

Software version (skip for WMF-hosted wikis like Wikipedia):

Android 10