Possible null reference argument for parameter 'key' in 'T ConcurrentDictionary<string, T>.this[string key]'.

Possible null reference return.

XML comment on 'BaseBuilder.HttpClientBuilder' has a typeparamref tag for 'T', but there is no type parameter by that name

Possible null reference argument for parameter 'key' in 'T ConcurrentDictionary<string, T>.AddOrUpdate(string key, T addValue, Func<string, T, T> updateValueFactory)'.

Possible null reference argument for parameter 'addValue' in 'string ConcurrentDictionary<T, string>.AddOrUpdate(T key, string addValue, Func<T, string, string> updateValueFactory)'.

Possible null reference argument for parameter 'name' in 'MemberInfo[] Type.GetMember(string name)'.

XML comment on 'BaseBuilder.HttpClientBuilder' has a typeparamref tag for 'T', but there is no type parameter by that name

Possible null reference return.

Possible null reference argument for parameter 'key' in 'T ConcurrentDictionary<string, T>.this[string key]'.