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Assume the user is on a mobile device iOS Safari (Or other browser), but you want a link to open into any other specific mobile browser app like Chrome, Safari, Firefox, Opera, Arc... How do you do that?

Chrome

To open on Chrome

<a href="googlechrome://example.com">try it on Chrome</a>

check out Chrome iOS Docs for more information

Redis in Production at Smyte

To be clear we continue to run many Redis services in our production environment. It’s a great tool for prototyping and small workloads. For our use case however, we believe the cost and complexity of our setup justifies urgently finding alternate solutions.

Each of our Redis servers are clearly numbered with a current leader in one availability zone, and a follower in another zone.
The servers run ~16 different individual Redis processes. This helps us utilize CPUs (as Redis is single-threaded) but it also means we only need an extra 1/16th memory in order to safely perform a BGSAVE (due to copy-on-write), though in practice it’s closer to 1/8 because it’s not always evenly balanced.
Our leaders do not every run BGSAVE unless we’re bringing up a new slave which is carefully done manually. Since issues with the slave should not affect the leader and new slave connections might trigger an unsafe BGSAVE on the leader, slave Redis processes are set to not automatically rest

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

	package main

	import (
	"context"
	"flag"
	"fmt"
	"io"
	"net"
	"net/http"
	"os"

	package main

	import (
	"encoding/binary"
	"io"
	"log"
	"os"

	"github.com/go-audio/audio"
	"github.com/go-audio/wav"

	package main

	import (
	"bufio"
	"fmt"
	"hash/fnv"
	"io"
	"os"
	)

	from flask import Flask, request, jsonify, json, abort
	from flask_cors import CORS, cross_origin

	import pandas as pd

	app = Flask(__name__)

	cors = CORS(app)
	app.config['CORS_HEADERS'] = 'Content-Type'

	// ==UserScript==
	// @name sinaimg
	// @namespace http://tampermonkey.net/
	// @version 0.1
	// @description try to take over the world!
	// @author You
	// @match ://.sinaimg.cn/*
	// @grant none
	// ==/UserScript==

	iplist=['192.168.1.33','10.5.1.3','10.5.2.4','202.98.96.68','133.120.1.1','192.168.1.22']
	import socket
	print sorted(iplist, key=socket.inet_aton)

	################################################################################
	# Method 1: Install using rpm packages (credit to DarkMukke)
	#

	rpm -Uvh http://mirror.ghettoforge.org/distributions/gf/gf-release-latest.gf.el7.noarch.rpm
	rpm --import http://mirror.ghettoforge.org/distributions/gf/RPM-GPG-KEY-gf.el7

	# WARNING: removing vim-minimal uninstalls `sudo` if you skip the second step
	# make sure to at least run `yum install sudo`
	yum -y remove vim-minimal vim-common vim-enhanced