I'm using the python libraries. The call above works perfectly when the category name is defined in ASCII letters, nevertheless problems arise when the category-name parameter is the Unicode text. In such case server responds with errors 404, 500 or even 401 - "Please provide valid credentials".
My exemplary name of the contact category is following:
All of the above values substituted to the URI as the category-name parameter result in error. What is the correct way of fetching the contacts that belong to a given category?
Maybe is there some other API call that allows to fetch contacts by the category ID?