Calvin.My

Posted by Calvin Chieng on June 13, 2017, 13:35

Uploading text string or file to S3

Via AWS Ruby SDK v2

Snippet AWS S3 Ruby SDK

Posted by Calvin Chieng on June 12, 2017, 16:08

Designing Android Icons

Rules and guidelines

Article Android Icons Design

Posted by Calvin Chieng on June 12, 2017, 05:03

Gradle build problem with unicode class and method name.

java.io.IOException: Failed to read zip file OR Error converting bytecode to dex

Error Gradle Android Unicode Obfuscation

Posted by Calvin Chieng on June 11, 2017, 23:25

Generate and validate request signature for HTTP APIs

To identify who is sending and the content received is what is intended to be sent.

Guide Rails API Signature

Posted by Calvin Chieng on June 11, 2017, 15:36

Convert p12 cert to pem format

Ruby, Openssl, pkcs12, apns, pem

Snippet P12 Convert PEM Cert

Posted by Calvin Chieng on May 21, 2017, 17:34

RSA public key encryption and private key decryption

With Ruby and Openssl

Guide Ruby OpenSSL Encryption Public Key

Posted by Calvin Chieng on May 18, 2017, 04:16

Basic NodeJs setup on Ubuntu 16.04

For production environment

Guide NodeJs NPM PM2 Nginx Setup

Posted by Calvin Chieng on May 8, 2017, 11:57

Removing links added when printing bootstrap pages

This only happens for bootstrap before version 4

Error Bootstrap 3 Print

Posted by Calvin Chieng on January 16, 2017, 12:26

Upgrading to Google Invisible reCaptcha

For better User Experience

Guide reCaptcha Setup Google

Posted by Calvin Chieng on December 23, 2016, 11:50

Use preconnect & dns-prefetch hint

To minimize time spent on connection setup

Article Optimization Hint Performance

Posted by Calvin Chieng on December 18, 2016, 02:54

The usage of schema.rb

A guide on when you use migration and when do you load schema

Article Database Rails Migration

Posted by Calvin Chieng on December 13, 2016, 14:32

Using delayed job in low demand system

Without using workers, but run periodically with much smaller frequency.

Guide Delayed Job Rails Cron job

Posted by Calvin Chieng on September 30, 2016, 16:37

Upgrade to Nginx mainstream 1.11.0 to solve a few http2 related problem

Use Nginx 1.11.0 if you are using http2 feature extensively in your application

Error HTTP2 Nginx iOS AFNetworking

Posted by Calvin Chieng on September 18, 2016, 16:21

TLS SSL protocols and cipher suites

Provide the correct cipher suites with the correct protocols for smooth and secure HTTPS experience.

Article SSL Security TLS

Posted by Calvin Chieng on September 17, 2016, 16:41

Whenever gem cron job bundle: command not found issue

Caused by path issue