public void GetOrAddRequestId()
        {
            // Arrange
            var data = new HeaderDictionary
            {
                new KeyValuePair <string, StringValues>(
                    "x-request-id",
                    new StringValues(Guid.NewGuid().ToString())),
            };

            // Act
            var actual = data.GetOrAddRequestId();

            // Assert
            Assert.NotNull(actual);
            Assert.True(Guid.TryParse(actual, out _));
        }