The `urllib3._collections.HTTPHeaderDict` is a specialized dictionary-like object used in the Python `urllib3` library. It is designed specifically to store HTTP headers in a case-insensitive manner, allowing easy retrieval and modification of header values. This class extends the functionality of the built-in `dict` type by providing methods and properties suitable for handling HTTP headers. It offers features such as header normalization, header folding, and updating header values with proper case sensitivity. The `urllib3._collections.HTTPHeaderDict` is commonly used in HTTP request and response objects to handle and manipulate headers efficiently.
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