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[Meta] Introduction to Front-End Development

[Meta] Introduction to Front-End Development

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Chaewon Jamie Yoon
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summary of the first chapter "Introduction to Front-End Development"

  • "The internet" = Interconnected Network

    a network is made up of at least two devices that connect and communicate via a wire or wireless connection.

  • "Web Server"

    server is a computer that runs applications and services.

    web server stores and delivers the content for a website to clients that request it.

  • "Web Page"

    a document that displays images, texts, videos and other content in the web browser.

  • "Web Site"

    a collection of webpages that link together.

  • "Web Browser"

    a software application that you use to browse The World Wide Web.

  • "IP Address" = Internet Protocol Address

    every computer on a network is assigned an IP Address.

    when you send a data across a network, IP Packets are sent.

    IP Packets contain header, payload(data), destination & source IP address.

    • TCP (Transmission Control Protocol) : slow but correct
      ex. text, image

    • UDP (User Datagram Protocol) : fast but can be lost

      ex. voice calls, live video streaming

  • "HTTP" = Hypertext Transfer Protocol

    a protocol used by web clients and web servers.

    core operational protocol of the world wide web.

    a request & response based protocol

    • "HTTPS"
      the secure version of HTTP

      before the content is sent, it is turned into a secret code.

  • Requests and responses share a common structure in HTTP

  • Request

    • Method

      • GET: to retrieve information from the server (request)

      • POST: to send data to the server (submit)

      • PUT: updates whatever currently exists on the web server (replace)

      • DELETE: removes the resource (delete)

    • / (path): representation of where the resource is stored on the server.

      ex. example.com/images/image.jpg

    • version: versions of the HTTP protocol (1.1, 2.0 are the most used)

    • headers: contains additional information

  • Response

    • HTTP Status Code

      • 1XX - Informational responses
        100 continue

      • 2XX - Successful responses
        200 OK

      • 3XX - Redirection responses
        301 Moved Permanently,
        302 Found

      • 4XX - Client error responses
        400 Bad Request: submitted bad data to the web server
        401 Unauthorized: user must log into an account before the request can be processed
        403 Forbidden: web server is refusing to process it (user doesn't have sufficient permissions)
        404 Not Found: the request was not found on the web server

      • 5XX - Server error responses
        500 Internal server error: the server failed to process the request

webserverwebpagewebsitenetworkhttp