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How to setup a practically free CDN using Backblaze B2 and Cloudflare

⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,

In some cases, only these lines will work

for product in IntelliJIdea WebStorm DataGrip PhpStorm CLion PyCharm GoLand RubyMine; do
    rm -rf ~/.config/$product*/eval 2> /dev/null
    rm -rf ~/.config/JetBrains/$product*/eval 2> /dev/null
done

But if not, try these

This script is also on greasyfork!

How to check file integrity with shasum

For verifying the integrity (but not authenticity of data, i.e., who authored it or the origin of the file) of a file, it is necessary to run a checksum function on the file which will output a value and compare it to a previously stored checksum value; if both values match, we can be relatively confident that the file hasn't been tampered with or altered.

You might be asked to verify a file's sha1sum or sha2sum–-all this means is calculating and verifying the cryptographic sha1 or sha2 hash value or digest included in the file.

Various commands and methods for verifying shasum 1 or 2:

Organic:
In terminal run:

	# mihomo (Clash Meta) 懒人配置
	# 版本 V1.5-240507
	# https://gist.github.com/liuran001/5ca84f7def53c70b554d3f765ff86a33
	# https://obdo.cc/meta
	# 作者: 笨蛋ovo (bdovo.cc)
	# Telegram: https://t.me/baka_not_baka
	# 关注我的 Telegram 频道谢谢喵 https://t.me/s/BDovo_Channel
	# 修改自官方示例规则 https://wiki.metacubex.one/example/#meta
	# 转载请保留此注释
	# 尽量添加了较为详尽的注释，不理解的地方建议对照虚空终端 (Clash Meta) Docs 进行理解

	package main

	import (
	"fmt"
	)

	type ErrNegativeSqrt float64

	func (e ErrNegativeSqrt) Error() string {
	return fmt.Sprintf("cannot Sqrt negative number: %v", float64(e))

	var socket = null;

	function bootstrap() {

	// 適当な図形を描画
	var c = document.getElementById('mycanvas');
	var ctx = c.getContext('2d');
	ctx.globalalpha = 0.3;
	for(var i=0; i<1000; i++) {
	ctx.beginPath();

	# mihomo (Clash Meta) 懒人配置
	# 版本 V1.5-240507
	# https://gist.github.com/liuran001/5ca84f7def53c70b554d3f765ff86a33
	# https://obdo.cc/meta
	# 作者: 笨蛋ovo (bdovo.cc)
	# Telegram: https://t.me/baka_not_baka
	# 关注我的 Telegram 频道谢谢喵 https://t.me/s/BDovo_Channel
	# 修改自官方示例规则 https://wiki.metacubex.one/example/#meta
	# 转载请保留此注释
	# 尽量添加了较为详尽的注释，不理解的地方建议对照虚空终端 (Clash Meta) Docs 进行理解

	.pointer-events-none { pointer-events : none }
	.pointer-events-auto { pointer-events : auto }
	.visible { visibility : visible }
	.invisible { visibility : hidden }
	.collapse { visibility : collapse }
	.static { position : static }
	.fixed { position : fixed }
	.absolute { position : absolute }
	.relative { position : relative }
	.sticky { position : sticky }

	# 東日本
	0000,2020/09/17 09:23:31
	1111,2404:01a8:7e00:0000:0000:0000:0000:0000/40
	1211,2404:01a8:0000:0000:0000:0000:0000:0000/32
	1212,2001:0c90:0000:0000:0000:0000:0000:0000/33
	1311,2408:0210:0000:0000:0000:0000:0000:0000/30
	1411,2400:2410:0000:0000:0000:0000:0000:0000/30
	1412,2409:0010:0000:0000:0000:0000:0000:0000/30
	1413,240b:0010:0000:0000:0000:0000:0000:0000/30
	1414,2404:7a80:0000:0000:0000:0000:0000:0000/30