Web scrape troubleshooting

list of technical issues

1. website revision: expected web content (of DOM element) was empty
   • Multiple sources of same column such as different HTML DOM but have the same column value.
   • Backup the HTML text of parent DOM element
   • (optional) complete HTML file backup
2. server ip ban
   • setting the temporization (sleep time) between pages ex: PHP: sleep - Manual, AutoThrottle extension — Scrapy 1.0.3 documentation
3. CATCHA
4. AJAX

Further reading

• stateless: Why say that HTTP is a stateless protocol? - Stack Overflow
• stateful: What is stateful? Webopedia Definition