I need advice or sample code to achieve a task related asynchronous ajax 
request that server side work takes plenty of time to finish its job.


Here is the sample scenario;

I've a simple CSV file upload form. User submits file

   - Server starts processing CSV file.
   - Server makes queries to external REST apis for each line of CSV file. 
   (additional network request/response delays)
   - Server parses each response (regex calculations, additional delays) 
   and stores data into database.
   - Server produces another output CSV file.

If the CSV file contains < 100 rows, it works even without using ajax. 
However I need to make it asynchronous to be able to feed a lot of rows. 
The critical part is I don't want to have timeouts as long as server side 
code is working. I want to be able to update client side regularly about 
the progress of work (log-like update, for example "x record is saved into 
database")

Can you provide me a working dummy sample code (for example, calculating 
fibonacci numbers) both client side and server side. (if possible django)

Thanks.

Regards.

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