1644d64398
A long-requested feature for HttpClient is the ability to store and retrieve custom metadata for requests, especially in interceptors. This commit implements this functionality via a new context object for requests. Each outgoing HttpRequest now has an associated "context", an instance of the HttpContext class. An HttpContext can be provided when making a request, or if not then an empty context is created for the new request. This context shares its lifecycle with the entire request, even across operations that change the identity of the HttpRequest instance such as RxJS retries. The HttpContext functions as an expando. Users can create typed tokens as instances of HttpContextToken, and read/write a value for the key from any HttpContext object. This commit implements the HttpContext functionality. A followup commit will add angular.io documentation. PR Close #25751
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