Recently, I developed a simple image tools and implemented some features using OpenCV, in NodeJS.

Here is my experience of using OpenCV in NodeJS…

Read More

This is a tutorial for building a PKI (Public Key Infrastructure) based on OpenSSL, including

• Key management
• Create root CA certificates
• Create secondary CA certificates
• Issue server certificates
• etc

For DEMO, please visit Fenying CA.

Read More

Last Sunday, I flashed the third-party firmware EvoX on the Xiaomi 12 I mainly use. Here is the whole process, in case I forget how to operate next time…

Excluding the process of unlocking the Bootloader.

Read More

Today we deployed a new service, behind an AWS application load balancer (ALB). There is an Nginx on every target host, to dispatch requests to each worker process inside the host.

Here is how to configure Nginx to get the real client IP behind AWS ALB.

Read More

In the AWS cloudfront origin policy, there is a cookies whitelist.

Read More