from scrapy.http import FormRequest
frmdata = {'id': 'com.supercell.boombeach', 'reviewType': '0',
    'reviewSortOrder': '0', 'pageNum': '0'}
url = 'https://play.google.com/store/getreviews'
r = FormRequest(url, formdata=frmdata)
fetch(r)
Send Post Request in Scrapy