The web application my development team is building at work provides a lot of data to our users, including downloadable Excel spreadsheets that can sometimes contain up to 250,000 rows’ worth of information. And our users have the ability to generate these reports, on demand, from our tool.
As you may imagine, it can sometimes take several minutes or more to compile this much data, and waiting around looking at a loading animation while our report service crunches numbers in the background wouldn’t be a great user experience.
Instead, we needed a way to check when the report service was done generating a report, without blocking a user from doing other work in our application while that was going on. We needed polling.

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