Rename class 'WebAPIQuerier' to match pascal case naming rules, consider using 'WebApiQuerier'. (https://rules.sonarsource.com/csharp/RSPEC-101)

Use the overload that takes a 'CultureInfo' or 'IFormatProvider' parameter. (https://rules.sonarsource.com/csharp/RSPEC-4056)

Catch a list of specific exception subtype or use exception filters instead. (https://rules.sonarsource.com/csharp/RSPEC-2221)

Split this method into two, one handling parameters check and the other handling the asynchronous code. (https://rules.sonarsource.com/csharp/RSPEC-4457)

Refactor this method so it invokes the overload accepting a 'System.Uri' parameter. (https://rules.sonarsource.com/csharp/RSPEC-3997)

Refactor this method to use all type parameters in the parameter list to enable type inference. (https://rules.sonarsource.com/csharp/RSPEC-4018)

Refactor this method to use all type parameters in the parameter list to enable type inference. (https://rules.sonarsource.com/csharp/RSPEC-4018)

Refactor this method to use all type parameters in the parameter list to enable type inference. (https://rules.sonarsource.com/csharp/RSPEC-4018)

Refactor this method to use all type parameters in the parameter list to enable type inference. (https://rules.sonarsource.com/csharp/RSPEC-4018)