Three months ago, during preparations for a leadership inspection of our WebGIS dashboard project (arguably its most critical application), our project manager urgently contacted me the night before: "XXX, emergency! The basemap's peripheral elements on the GIS dashboard have disappeared—only data remains visible!"
Reluctantly accessing the system, I discovered the dynamic visualizations had vanished. Console errors revealed resource loading failures traced to our CDN service. Checking my personal CDN account (used due to small company scale), I found payment overdue—promptly recharging 200 CNY.
A month later, while debugging new features, CDN errors recurred. Initially attributing this to post-exhibition traffic spikes (even boasting about "high system usage" to my manager), I recharged another 200 CNY.
When another billing alert arrived just weeks later—despite the exhibition ending months prior—abnormal traffic patterns became undeniable.
Initial Investigation
Qiniu Cloud's backend revealed alarming patterns: 