Custom fields of type "url" should make sure the URL is properly urlEncoded. For example, if a user types in:
https://img.washingtonpost.com/r/2010-2019/WashingtonPost/2015/07/23/Food/Images/Beer Pics1437670921.jpg
https://img.washingtonpost.com/r/2010-2019/WashingtonPost/2015/07/23/Food/Images/Beer%20Pics1437670921.jpg
URL field is browser enforced.
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URL field is browser enforced.