When linking external URLs, space char ' ' is HTLM encoded.
Example: 'https://jira.atlassian.com/browse/JRA-1330 ' <--- Space here.

=> 'https://jira.atlassian.com/browse/JRA-1330 '

See for instance: https://answers.atlassian.com/questions/8665/how-can-we-implement-the-concept-of-a-customer-entity-in-jira

URL should be trimmed if not properly encoded by the user.