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並前往https://codereview.stackexchange.com/questions/166467/chaining-3-dependent-http-request-subscriptions-one-which-is-polling

Chaining 3 dependent HTTP request subscriptions one, which ...

switchMap (()=> this.http.get(`example.com/roomPresences/${deviceid}/latest`).map(res => res.json()).catch(this._serverError)); }.

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