Fixed NullReferenceException on parallel requests #728
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At startup, a single instance of
CurrentRequestMiddleware
is created, which is used to process multiple requests in parallel. Therefore it cannot contain request-specific state in its fields, because parallel requests then overwrite the state of each other.As a result of overwriting state, the FilterService is unable to find the matching CurrentRequest data, causing a NullReferenceException in its constructor.
Fixes #727.