Man Vuong kidlab

Upload a file with $.ajax to AWS S3 with a pre-signed url

When you read about how to create and consume a pre-signed url on this guide, everything is really easy. You get your Postman and it works like a charm in the first run.

Then you open your browser, try your usual $.ajax() and send your PUT operation, and you hit the cold iced wall of AWS error message, a simple <Code>SignatureDoesNotMatch</Code> that will steal hours from your productivity.

So here I come to save you and give you a free working example of how to upload a file directly to AWS S3 from your browser. You are wellcome :).

Forcing HTTPS Redirection and Cloudflare’s Flexible SSL

If you force http to https redirection on your website, while using CloudFlare, with the following normal methods, a loop redirection occurs.

RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule .* https://%{SERVER_NAME}%{REQUEST_URI} [R=301,L]

Normal Redirect via PHP

This runs a build for a small elixir (phoenix) project in about 40 seconds by caching as much of the compiled files as possible.

We've been using this for months in multiple projects without any issues. Please ping be if there is any issues with this script and I'll update it.

It should be generic enough to work on any elixir app using mix.

If you have a elixir_buildpack.config, then enable that section in the build script to keep versions in sync!

2016-08-09: Updated to newer Erlang and Elixir and fixed curl command.

This list is based on aliases_spec.rb.

You can see also Module: RSpec::Matchers API.

matcher	aliased to	description
a_truthy_value	be_truthy	a truthy value
a_falsey_value	be_falsey	a falsey value
be_falsy	be_falsey	be falsy
a_falsy_value	be_falsey	a falsy value

Add the utf8_sanitizer.rb to your Rails 3.2 project in app/middleware. Instead of removing the invalid request characters and continuing the request (as some gems do) it returns a 400 error.

Add the following line to your config/application.rb:

config.middleware.use 'Utf8Sanitizer'

If you only need it in production add to config/environments/production.rb. This can be without quotes:

config.middleware.use Utf8Sanitizer

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	#!/bin/sh

	#Check the Drive Space Used by Cached Files
	du -sh /var/cache/apt/archives

	#Clean all the log file
	#for logs in `find /var/log -type f`; do > $logs; done

	logs=`find /var/log -type f`
	for i in $logs

	# ActiveRecord's find_each and find_in_batches ported to Sequel.
	# Sequel's paged_each is not practical when converting large data due to its use of transaction and offset.
	#
	# Usage:
	#
	# SequelEachInBatches.find_each(dataset, keys) { \|record\| ... }
	#
	# It can also monkey patch Sequel::Dataset:
	#
	# Sequel::Dataset.send(:include, SequelEachInBatches)

	BEHAVIOUR:
	http://reka.co -> https://reka.co
	http://www.reka.co -> https://reka.co
	https://www.reka.co -> https://reka.co

	MAKE SURE YOU SET CLOUDFLARE SLL TO (FULL STRICT)
	upstream unicorn {
	server unix:/tmp/unicorn.appsname.sock fail_timeout=0;
	}

	class Person {
	class func classString() -> String {
	return NSStringFromClass(self)
	}
	}


	Person.classString() // "_TtC11lldb_expr_06Person"