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ResponseObject method to use correct application/json MIME type instead of text/json.
new and inline object initializers for cleaner and more concise code. Remove redundant static readonly Utf8Encoding instances in favor of Encoding.UTF8.
SafeGet, SafeSet, and SafeRemove methods. Adjust IWebContext and related tests to support nullable value types in dictionary operations. Refactor GetRequestParameter for clarity and consistency.