The detailed description in the QUrl documentation refers to methods which are deprecated. For example "Constructing a query is particularly convenient through the use of setQueryItems(), addQueryItem() and removeQueryItem(). Use setQueryDelimiters() to customize the delimiters used for generating the query string."

addQueryItem() for example is deprecated and marked with QT_DEPRECATED_SINCE(5, 0), so the documentation should recommend the new way of doing it.

I didn't do an exhaustive search for cases like this in the documentation.