Rename type name ResponseHandlerDelegate so that it does not end in 'Delegate' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1711)

Call the ArgumentOutOfRangeException constructor that contains a message and/or paramName parameter (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2208)

'string.Replace(string, string)' has a method overload that takes a 'StringComparison' parameter. Replace this call in 'MockHttp.Matchers.HttpHeadersMatcher.ToString()' with a call to 'string.Replace(string, string, System.StringComparison)' for clarity of intent. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1307)

In virtual/interface member IResponseBehavior.HandleAsync(MockHttpRequestContext, HttpResponseMessage, ResponseHandlerDelegate, CancellationToken), rename parameter next so that it no longer conflicts with the reserved language keyword 'Next'. Using a reserved keyword as the name of a parameter on a virtual/interface member makes it harder for consumers in other languages to override/implement the member. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1716)

Rename type name ResponseHandlerDelegate so that it does not end in 'Delegate' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1711)

Modify 'TryAdd' to catch a more specific allowed exception type, or rethrow the exception (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1031)

In virtual/interface member IResponseBehavior.HandleAsync(MockHttpRequestContext, HttpResponseMessage, ResponseHandlerDelegate, CancellationToken), rename parameter next so that it no longer conflicts with the reserved language keyword 'Next'. Using a reserved keyword as the name of a parameter on a virtual/interface member makes it harder for consumers in other languages to override/implement the member. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1716)

Call the ArgumentOutOfRangeException constructor that contains a message and/or paramName parameter (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2208)

Modify 'TryAdd' to catch a more specific allowed exception type, or rethrow the exception (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1031)