google app engine - Asynchronous requests in AppEngine -
i'm building app following: get user enter parameters. pass params backend , start task based on params. when task complete redirect user page showing results of task. the problem here task expected take quite long. hoping make request asynchronous. appengine allow ? if not, options ? looking @ documentation task queues. while satisfies part of i'm trying do, i'm not clear on how queue notifies client when task complete, redirect can initiated. also, if results of task have returned calling client ? possible ? you can't (shouldn't really) wait completion, gae not designed that. launch task, task id (unique, persisted in app) , send id client in response launch request. the client can check, either polling (at reasonable rate) or on-demand, status page (you can use id find right task). can add progress/eta info on page, down road if desire. after task completes next status check request client can redirected results page mentioned. this...