'How to call same start_urls for different search codes in scrapy

Apologies in advance, if my question sounds pretty lame.

As per my crawling requirements, I need to hit 1 url and search for 1 item at a time in the search box from the list of itemcodes. If i give the base url in start_urls, parse method will be called only once and all items will not be processed. How do I make sure

  1. to have concurrent processing of different itemcodes
  2. to process all itemcodes by having a single start_url

Ex: items_list = ['A', 'B', 'C'], need to process items in items_list concurrently with same start_url



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