proxy effort codes - SERP Analysis

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https://community.fly.io/t/set-proxy-attempt-limit/22834

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https://blog.caveon.com/proxy-test-takers

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https://www.law.cornell.edu/regulations/michigan/Mich-Admin-Code-R-432-532f

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https://www.ndss-symposium.org/ndss-paper/your-phone-is-my-proxy-detecting-and-understanding-mobile-proxy-networks/

https://curl.se/docs/manpage.html

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https://help.duo.com/s/article/2953

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https://www.proxypreview.org/contributor-articles-2024/a-code-for-corporate-political-spending-disclosure

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https://community.platformio.org/t/proxy-issue-in-vs-code/5602

https://community.theforeman.org/t/rfc-putting-smart-proxy-behind-apache/17350

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https://community.developer.atlassian.com/t/407-proxy-authentication-required-error-using-requestjira/85274

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https://docs.cloudbees.com/docs/cloudbees-ci-kb/latest/client-and-managed-controllers/update-sites-gives-unable-to-tunnel-through-proxy

https://blog.cloudflare.com/a-primer-on-proxies/

https://scrapfly.io/blog/what-is-http-407-status-code-and-how-to-fix-it/