Product, AI & Engineering
Practical notes for building and operating modern digital products.
Operational patterns across Next.js App Router, content systems, search indexing, performance optimization, and monetization.
Latest Posts
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devops
3 min read
We analyze the reasons why hard cuts lead to failures in L4 Load Balancer and Nginx-WebSocket architecture from the connection lifecycle perspective.
devops
4 min read
We dissect what connection state changes actually occur in L4 Load Balancer by bind, unbind, and connection draining based on the TCP lifecycle.
devops
4 min read
We decompose Connection Draining into TCP lifecycle and explain how SYN, FIN, RST, TIME_WAIT, and CLOSE_WAIT appear in actual operational indicators.
devops
4 min read
The phenomenon of connection draining not ending due to WebSocket persistent connection is analyzed from the perspective of TCP, Nginx proxy, and application, and five solutions are presented.