Methods and apparatus to measure exposure to streaming media are disclosed. An example apparatus includes a server to access metadata identifying media presented to a user, and cookie data, the metadata and the cookie data provided by a client device. A user identifier comparator is to determine whether the cookie data identifies the user to the database proprietor, the server to, in response to the user identifier comparator determining that the cookie data does not identify the user to the database proprietor, send a redirect message instructing the client device to retransmit the metadata to a next-hop location. A metadata transmitter is to, in response to the user identifier comparator determining that the cookie data does identify the user to the database proprietor, provide the metadata and the user identifier to a central facility.