Samsung Just Made a Significant Memory Chip Breakthrough

If there is one thing that Samsung has managed to surpass its competitors in, it’s memory chips. The South Korean tech giant has made a lot of progress in advancing RAM technology and this has what has allowed smartphones to be as powerful as they are now while at the same time being quite thin and...

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by Zia Muhammad via Digital Information World

Twitter has officially rebranded ‘Retweets with comment’, introduced ‘Quote Tweets’ instead for all users

Twitter has been testing a way to change its ‘Retweet with comment’ feature for a much precise and better name. Recently, it came up with ‘Quotes’ and now, it has officially launched the rebranded name ‘Quote Tweets’ in the place of ‘Retweets with comment.’ Before this official launch, Quotes...

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by Arooj Ahmed via Digital Information World

Researchers Conducted An Endurance Test To Determine The Best Security Product For Android: Avira, Bitdefender, G Data, Norton Trend Micro Are On Top, Google's Performance Is Still Not Satisfactory

Many people still believe that it is enough to always download applications from Google’s Play Store (as the tech giant has its top notch security systems in place) to stay protected on Android devices. However, security experts recommend that you should download a dedicated software solution that...

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by Arooj Ahmed via Digital Information World

Building Microservices with Deno, Reno, and PostgreSQL

In this tutorial, we show you how to go about building microservices with Deno, and introduce you to Reno — a thin routing library for Deno. We’ll explore how we can use this newer JavaScript platform to build a microservice that exposes endpoints for acting on a database.

Deno is a JavaScript and TypeScript runtime from Node.js creator Ryan Dahl that aims to address some of the latter technology’s shortcomings, such as simplifying the module path lookup algorithm and more closely aligning the core APIs with their browser-based equivalents. Despite these fundamental differences, the potential applications of Deno and Node.js are mostly identical. One of Node’s core strengths lies in building HTTP services, and the same can be argued for Deno.

Writing HTTP Servers with std/http

Before we introduce a routing library or contemplate our data access layer, it would be useful to step back and build a simple HTTP server with the std/http module, which is part of Deno’s standard library. If you haven’t already, install Deno. In a Unix-type operating system, you can run:

$ curl -fsSL https://deno.land/x/install/install.sh | sh -s v1.3.0

Note that this tutorial has been developed against 1.3.0 (and std 0.65.0 as we’ll see later), but any later 1.x versions you may be using should be compatible. Alternatively, if you’re running an older version of Deno, you can upgrade to 1.3.0 with the deno upgrade command:

deno upgrade --version 1.3.0

You can verify that the expected Deno version has been installed with deno --version.

We’re now in a position to build an HTTP server. Create a directory, within your usual development directory, named deno-hello-http, and open it in your editor. Then, create a file called server.ts, and use the listenAndServe function within std/http to build our server:

import { listenAndServe } from "https://deno.land/std@0.65.0/http/mod.ts";

const BINDING = ":8000";

console.log(`Listening on ${BINDING}...`);

await listenAndServe(BINDING, (req) => {
  req.respond({ body: "Hello world!" });
});

Developer Experience Protips

If you’re using VS Code, I’d heavily recommend the official Deno extension, which provides support for Deno’s path resolution algorithm. Additionally, you can run deno cache server.ts to install the dependencies and their TypeScript definitions, the latter serving as an invaluable API guide when writing your code.

We can start our server by running deno run --allow-net server.ts in our shell. Note the --allow-net permissions flag, granting our program with network access. Once listening on port 8000, we can target it with a HTTP request:

$ curl -v http://localhost:8000/ ; echo

> GET / HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.58.0
> Accept: */*
>
< HTTP/1.1 200 OK
< content-length: 12
<

Hello world!

Great! With a few lines of TypeScript, we’ve been able to implement a simple server. That said, it isn’t particularly well-featured at this point. Given that we consistently serve "Hello world!" from our callback function, the same response will be returned for any endpoint or HTTP method. If we hit a server with POST /add, we’ll receive the same headers and body:

$ curl -v -d '{}' http://localhost:8000/add ; echo

> POST /add HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.58.0
> Accept: */*
> Content-Length: 2
> Content-Type: application/x-www-form-urlencoded
>
< HTTP/1.1 200 OK
< content-length: 12
<

Hello world!

We can limit the existing response to GET / by conditionally checking the url and method properties of our callback’s req parameter:

import {
  listenAndServe,
  ServerRequest,
} from "https://deno.land/std@0.65.0/http/mod.ts";

const BINDING = ":8000";

console.log(`Listening on ${BINDING}...`);

function notFound({ method, url }: ServerRequest) {
  return {
    status: 404,
    body: `No route found for ${method} ${url}`,
  };
}

await listenAndServe(BINDING, (req) => {
  const res = req.method === "GET" && req.url === "/"
    ? { body: "Hello world" }
    : notFound(req);

  req.respond(res);
});

If we restart our server, we should observe that GET / works as expected, but any other URL or method will result in a HTTP 404:

$ curl -v -d '{}' http://localhost:8000/add ; echo

> POST /add HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.58.0
> Accept: */*
> Content-Length: 2
> Content-Type: application/x-www-form-urlencoded
>
< HTTP/1.1 404 Not Found
< content-length: 28
<

No route found for POST /add

std/http Beyond Simple Services

Bootstrapping trivial HTTP servers with Deno and std/http has proven to be relatively straightforward. How does this approach scale for more complex services?

Let’s consider a /messages endpoint that accepts and returns user-submitted messages. Following a RESTful approach, we can define the behavior of this endpoint and of our service overall:

Continue reading Building Microservices with Deno, Reno, and PostgreSQL on SitePoint.

by James Wright via SitePoint

The Psychological Factors Leading to Viral Misinformation

Misinformation has always been a serious problem on social media. It has lead to scientifically false narratives such as the anti-vaccination movement among other things, but in the age of the coronavirus pandemic this problem has started to seem even more serious than before. Big social media...

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by Zia Muhammad via Digital Information World

Google Is Working On A New Web Standard Called WebBundles Which Is Dangerous To The Privacy Of Internet Users, Security Researchers Warned

Google is proposing a new web standard that allows sites to ‘bundle’ an entire webpage into a single file, and it could made it impossible for web browsers to process sub-resources by Uniform Resource Locator (URL). Called the WebBundles, it is dangerous to transparency as well as the privacy of...

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by Arooj Ahmed via Digital Information World

Here Are the Countries With the Best (and Worst) Wi-Fi Access

The internet is no longer a luxury or an oddity. It is now an essential part of modern living. It gives ready access to information, can facilitate business and can allow people to stay connected with one another. However, a lot of countries don’t have very good internet, whereas others might have...

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by Zia Muhammad via Digital Information World