BE-1: Web Scraping Fundamentals & Anti-Blocking Techniques Research

[tecnodeveloper]

Description:
Research how web scraping works, how websites detect bots, and how scrapers avoid being blocked. Understand scraping lifecycle, request behavior, and anti-blocking techniques used in real production systems.

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User Story

Given I want to extract product data from websites
When I perform web scraping
Then I should understand how to do it without getting blocked or banned

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Tasks

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Web Scraping Basics

1. Understand What Web Scraping Is

   • Learn definition of web scraping
   • Understand HTML structure extraction
   • Identify static vs dynamic websites

2. Understand How Websites Load Data

   • Server-rendered pages
   • Client-side rendered pages
   • API-based data loading

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HTTP Fundamentals

3. Understand HTTP Requests

   • GET vs POST requests
   • Headers importance
   • Cookies and sessions

4. Learn Status Codes

   • 200 (OK)
   • 403 (Forbidden)
   • 404 (Not Found)
   • 429 (Rate limit)

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Scraping Techniques

5. Basic HTML Parsing

   • Use BeautifulSoup / DOM parsing
   • Extract product title, price, image

6. Dynamic Content Scraping

   • Understand JavaScript-rendered pages
   • Use browser automation tools

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Anti-Blocking Mechanisms

7. Understand Bot Detection

   • IP tracking
   • User-Agent detection
   • Behavior tracking

8. Rate Limiting

   • Avoid too many requests
   • Add delays between requests

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IP Blocking Prevention

9. Proxy Usage

   • Rotate IP addresses
   • Use proxy pools
   • Understand residential vs datacenter proxies

10. User-Agent Rotation

• Fake browser headers
• Rotate user agents

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Advanced Anti-Detection Techniques

11. Headless Browser Detection Avoidance

• Use real browser simulation
• Avoid headless fingerprints

12. Human Behavior Simulation

• Random delays
• Mouse movement simulation
• Scroll behavior

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Scraping Tools Research

13. Study Scraping Libraries

• BeautifulSoup
• Selenium
• Playwright

14. API-Based Scraping Tools

• Scrapy
• ScrapingBee
• FireCrawl

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Legal & Ethical Considerations

15. Understand Legal Boundaries

• robots.txt rules
• Terms of Service restrictions
• Data privacy concerns

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Performance Optimization

16. Efficient Scraping Strategy

• Batch requests
• Cache responses
• Avoid redundant scraping

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Real-World Case Study

17. Analyze E-Commerce Websites

• Amazon structure
• Shopify stores
• Flipkart patterns

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Monitoring & Stability

18. Detect Blocking Early

• Monitor 403/429 responses
• Retry strategies
• Backoff mechanisms

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Acceptance Criteria

• Web scraping basics understood
• Anti-blocking strategies identified
• Tools compared
• Real-world scraping challenges studied
• Safe scraping strategy defined

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Testing Steps

1. Try simple HTML scraping
2. Test blocked request scenarios
3. Simulate rate limiting
4. Test proxy rotation concept
5. Compare tool behavior

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Definition of Done

• Scraping fundamentals fully understood
• Anti-blocking strategy documented
• Tool stack identified

[BuyWhere]

If your goal is getting product pricing data without the scraping maintenance burden, you might want to check out the BuyWhere MCP server. It provides structured product search and price comparison across Singapore retailers (Shopee, Lazada, Amazon.sg, FairPrice, Guardian, Watsons, etc.) via a clean API — no scraping, no anti-blocking, no HTML parsing.

For the research phase, it could be useful to compare the structured API approach vs. scraping in terms of reliability, maintenance cost, and data quality. Happy to share integration patterns if useful.