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Technical posts focused on deployment, troubleshooting, and development practice.

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Leon's Insights

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Building a digital stronghold in the world of 0 and 1.

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Overview

17Articles
59Tags

Selected Reads

Tutorials and practical posts

Cloudflare for SaaS + Worker: Optimal IP Routing and Edge Cache Proxy for Vercel

01

Mar 6, 2026

Chrome Translate Caused React Hydration Errors β€” Diagnosis and Mitigation

02

Jan 31, 2026

ABF507 Final Exam Review (Weeks 8–13) + High-Frequency Predictions

03

Jan 24, 2026

Latest Posts

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AI

Prompt for Reducing AI Rate in Papers

March 11, 2026
5 min read
2 views
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Blog

Migrating Heroku Backend to Render

Why Render Before the migration, I compared several mainstream cloud platforms and ultimately chose Render.

March 8, 2026
5 min read
2 views
python3render
Final Exam Review

ABF507 Final Exam Review: Mock Exams + Critical Questions

ABF507 Mock Exam 1 - 8 Core Topics πŸ“‹ Exam Information | Item | Details | |------|---------| | Total Points | 100 | | Time Allowed | 120 minutes | | Questions | 8 Questions | |

January 25, 2026
30 min read
ABF507Mock Exam
Final Exam Review

ABW505 Mock Exams (1+2): Python & Machine Learning (Verified Answers)

ABW505 Mock Exam 1 - Python & Machine Learning πŸ“‹ Exam Information | Item | Details | |------|---------| | Total Points | 100 | | Time Allowed | 90 minutes | | Format | Closed boo

January 24, 2026
39 min read
ABW505Mock Exam
Final Exam Review

ABW505 Complete Question Bank: Python & Machine Learning (All English)

ABW505 Complete Question Bank - Python & Machine Learning > πŸ“š All code in this document has been verified and tested. Every answer includes detailed explanations and comments. --- πŸ“‹ Exam S

January 24, 2026
36 min read
ABW505Python
Final Exam Review

ABW501 Mock Exams (1+2): Analytics Edge (With Answers)

ABW501 Mock Exam 1 - Analytics Edge πŸ“‹ Exam Information | Item | Details | |------|---------| | Total Points | 100 | | Time Allowed | 90 minutes | | Format | Closed book, calculat

January 24, 2026
19 min read
1 views
ABW501Mock Exam
Final Exam Review

ABF507 Final Exam Review (Weeks 8–13) + High-Frequency Predictions

πŸ“š Exam Info - Format: 5 essay/short-answer questions - Coverage: Weeks 8–13 - Core Topics: GDP, utility, oligopoly, supply & demand, fiscal/monetary policy, trade, inequality, elasti

January 24, 2026
3 min read
1 views
ABF507Macroeconomics
Articles

Cloudflare Worker Cron Watchdog: SPOF Fix and Automatic DNS Failover for the Vercel Proxy Architecture

The third-party CNAME node pool in the optimized proxy setup is a hidden single point of failure (SPOF). This guide implements a zero-cost watchdog using Cloudflare Worker Cron Triggers: Google DoH serves as an external probe to monitor upstream health, with automatic DNS failover and recovery between the optimized CNAME and CF official IPs.

March 7, 2026
6 min read
CloudflareWorker
Articles

Cloudflare for SaaS + Worker: Optimal IP Routing and Edge Cache Proxy for Vercel

A practical guide on using Cloudflare for SaaS combined with Workers to solve Vercel's high latency and connection reset issues in mainland China. Build a centralized Worker routing hub to achieve multi-project domain dispatch, optimized IP ingress, and edge-node static asset caching.

March 6, 2026
7 min read
2 views
VercelCloudflare
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