Databay field notes
Proxy guides, experiments & operator notes
Engineering guides and first-party measurements for people operating proxy-backed data systems.
- 01Guides32
- 02Tutorials17
- 03Comparisons14
- 04Research7
Newest update Aug 23, 2026 · methodology-open research
Tutorials
17 entries
ERR_TOO_MANY_REDIRECTS: How to Break a Redirect Loop
The browser gave up on a redirect loop. Fix it as a visitor in two minutes, see the loop with curl, and repair the server rules causing it.
10 min readRead
ERR_TUNNEL_CONNECTION_FAILED: Causes and How to Fix It
ERR_TUNNEL_CONNECTION_FAILED means a proxy would not open the CONNECT tunnel HTTPS needs. What a tunnel is, and fixes ranked by the real...
12 min readRead
How to Test a Free Proxy Safely
Use unknown public proxies only for disposable, non-sensitive diagnostics against systems you are authorized to test.
3 min readRead
Proxies for Price Monitoring: An Ecommerce Workflow
Use proxies for price monitoring with an authorized ecommerce workflow that normalizes offers, controls network location, and scores a...
12 min readRead
Web Scraping With Proxies: An Authorized, Reliable Workflow
Design authorized data collection around APIs, source rules, a domain-level budget, stop conditions, and quality checks; a proxy is only...
4 min readRead
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