Learn Http, Mdx and Parti-corgi

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How to Livestream Code and Design on Twitch

In this course, we will learn the fundamentals of the Hypertext Transport Protocol (HTTP) by exploring several popular HTTP APIs such as the GitHub API. Starting with the basic structure of an HTTP request and response, we will then delve into the specifics of each element of the request/response messages. Using concrete examples from these APIs, we will cover request methods, response status codes, messages headers, and message bodies. Along the way, you'll learn about specific message headers, such as `Cache-Control`, and `Cookie`  and how they control the behavior of clients/browsers and HTTP API services.

This course uses HTTPie, if you would like to follow along with the instructor you can download the client [here](https://httpie.org/).

The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. It is a generic, stateless, protocol which can be used for many tasks beyond its use for hypertext, such as name servers and distributed object management systems, through extension of its request methods, error codes and headers.

http

Understand the Basics of HTTP

As developers, we're often working closely with APIs to make requests in the browser or on the backend with a server, but we might not always know exactly how those requests work or how they should look.

Postman is a tool that lets us create, manage, and test API endpoints all within a UI so we can wrangle our APIs and understand how they work.

Create, Manage, and Test API Requests with Postman

MDX has grown rapidly since the first commit two and a half years ago. We'd like to celebrate our accomplishments so far, and talk about what lies ahead. We've got lots of plans.
Learn how MDX increases developer productivity, improves educational content authoring, and even peek behind the curtains to see how MDX works.

MDX is an authorable format that lets you seamlessly use JSX in your markdown documents. You can import components, like interactive charts or notifications, and export metadata. This makes writing long-form content with components a blast.



MDX Conf 2020

The HTTP GET & HEAD methods are used to retrieve information about a resource. The GET method will retrieve the metadata about the resource, encoded in the HTTP headers, as well as a representation of the resource itself in the message body (e.g. a JSON document with fields that describe a user). The HEAD method behaves like GET, but only retrieves the status and headers; this can be useful when you need some metadata about a resource (e.g. the Last-Modification time), but don't want to waste time or bandwidth fetch the resource itself in the message body. Finally, we discuss the idempotent and safe natures of these HTTP methods.

Use HTTP GET & HEAD Methods

The 2xx family of status codes are used in HTTP responses to indicate success. Beyond the generic `200 OK` status code, there are a set of more specific success status codes that provide additional context or details about the specific nature of the successful request/response. We will explore the available success status codes, and what additional information they convey.

Understand 2xx HTTP Status Code Responses

The body of an HTTP request or response can serve many functions, from including the input data to a POST request, to returning varied representations of a resource in response to a GET request. This lesson details how message bodies are handled in requests and responses, and the associated HTTP headers that provide metadata about the included message body.

Examine HTTP Message Bodies

The HTTP DELETE method is used to request that the server perform a delete operation on the specified resource with resource specific semantics. Behind the scenes, the delete operation may result in a removal of a file from the filesystem, or an update to the database to reflect the change. Because multiple requests to delete the same resource has the same effect as a single one, the DELETE method is considered ‘idempotent’, but not considered safe.

Use HTTP DELETE Method

The HTTP OPTIONS method is used to request information about the communication options available for the target resource. The response may include an Allow header indicating allowed HTTP methods on the resource, or various Cross Origin Resource Sharing headers. The HTTP OPTIONS method is both safe and idempotent, as it is intended only for use in querying information about ways to interact with a resource.

Use HTTP OPTIONS Method

The HTTP PATCH method is used to make modifications to existing resources. In particular, it is designed for "partial updates", as opposed to replacing an entire resource using the HTTP PUT method. Although certain HTTP PATCH requests may behave idempotently, this is not true of all possible PATCH requests, so this request method is not idempotent, nor considered safe. The request body of a PATCH request may be simple `application/json`, or a more specialized type, such as `application/json-patch+json`.

Use HTTP PATCH Method

The HTTP POST method is used to request the resource process the included request message body representation according to resource specific semantics. HTTP POST is loosely defined by definition, and can be used in many different scenarios, such as creating a new resource based on the request representation, appending data to an existing representation, or generic processing of an HTML form submission. Due to the nature of POST performing arbitrary resource specific processing, it is considered neither ‘safe’, nor ‘idempotent’.

Use HTTP POST Method

The 4xx family of status codes are used in HTTP responses to inform the client/browser of an error relating to the user’s request. The status codes in this family are intended to indicate a problem that should be possible to fix or remedy by the user or developer. For example, a 401 Unauthorized status code lets the user/developer know they need to provide authorization information with their request; should they re-submit the request with the additional authorization header, the request may succeed. We will explore the available client error status codes, and what additional information they convey.

Understand HTTP 4xx Client Error Response Codes

The 5xx family of status codes are used in HTTP responses to inform the client that the server experienced an error. The status codes in this family are intended to indicate server or network errors that do not pertaining to a problem with client or the client’s request. For example, a response with a 503 Service Unavailable status code is unlikely to be resolved by resubmitting the request with different content type or additional headers. We will explore the available server error status codes, and what additional information they convey.

Understand 5xx Server Error Response Codes

Previously to tackle manual restarts due to server crashes , process management tools were used. 

Forever is one such module that is runs on the node ecosystem. So, we need not move away from the rich ecosystem of Node.js.

Use ``` npm install --global forever ``` to install forever module globally.
 

Running your server forever using forever in Node.js

Understand the three basic parts of making HTTP requests in Elm: 1) Building the request, 2) Writing a JSON decoder, 3) Sending the request using the Elm runtime, and reacting to the results with messages.

HTTP requests are just pieces of data in Elm. When we want to send them, we hand them off to Elm's runtime, and it notifies us when the request is done. An important part of working with HTTP requests that fetch JSON is JSON decoding, the process by which we can turn untyped JSON data into Elm types that are safe to work with.

Specs:

- Editor: Atom
- Theme: [Nebula (with Nebula syntax theme)](https://atom.io/themes/nebula-ui)
- Font: [Iosevka with ligatures enabled](https://github.com/be5invis/Iosevka)
- Plugin used for imports: [Elmjutsu](https://atom.io/packages/elmjutsu)
- Plugin used for formatting: [Elm-format](https://atom.io/packages/elm-format)
- Plugin used for linting: [linter-elm-make](https://atom.io/packages/linter-elm-make)


Make an HTTP Request in Elm

The 3xx family of status codes are used in HTTP responses to inform the client/browser should look somewhere else for the requested resource. Most often, this is used to indicate a resource is temporarily or permanently found at a new URL, but it may also be used to inform the client that the client’s own cache is the other location where the requested resource can be found. We will explore the available redirection status codes, and what additional information they convey.

Understand HTTP 3xx Redirection Response Codes

Let's look at several HTTP requests to learn the basic structure of these messages, and how the various elements communicate important information from the client/browser to the API service. 
Follow the instructions at [HTTPie](https://httpie.org/) to download the CLI tool and follow along.

Understand what an HTTP Request is

Let's look at several HTTP responses to learn the basic structure of these messages, and how the various elements communicate important information from the API service to the client/browser.

Understand what an HTTP Response is

`curl` is how you make HTTP requests from the command line. It's awesome for testing out APIs because you have full control over all the headers that are sent, and you don't have to interact with a UI to send a request. 

We’ll learn how to make requests and change the HTTP method, set headers, and send JSON and url encoded form data. We'll also see how to increase readability by splitting long requests into multiple lines and formatting JSON responses with `jsome`, a node module.

Make HTTP Requests in Bash with `curl`

Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications.

express

In this lesson, we'll learn how to add https (and remove http) support to the localhost version of our express application. By adding https support, we'll be able to prevent a MITM (in this case Charles Proxy) from reading our session id, mitigating the attack known as "session hijacking".

Add https to a Localhost Express App to Prevent MITM Attacks

In this lesson, we'll learn how to use Charles Proxy to “sniff” the web traffic flowing an example website using an attack known as a Man in the Middle attack, or MITM. Because our example website is using http and not https, you'll “discover” a vulnerable piece of user data called a session id being transmitted in cleartext across every request. This info will become the central piece of data that we'll learn how to protect throughout this course.