Web notes

Writing folder and file names lowercase with no spaces and with words separated by hyphens

• Internet work?

Protocol Layer: Application Protocols Layer: WWW, e-mail, FTP, etc. Transmission Control Protocol Layer: TCP derict to [port] (some application) Internet Protocol Layer: IP Hardware Layer: Converts binary packet data to network signals and back. (telecomunacation)

• HTTP?

A typical HTTP request contains:

• HTTP version type
• a URL
• an HTTP method
• HTTP request headers
• Optional HTTP body

HTTP status code

• 1xx Informational
• 2xx Success
• 3xx Redirection
• 4xx Client Error
• 5xx Server Error

HTTP is stateless, but not sessionless

Chrome run multiple instances of the rendering engine: one for each tab. Each tab runs in a separate process.

• The user interface: this includes the address bar, back/forward button, bookmarking menu, etc. Every part of the browser display except the window where you see the requested page.
• The browser engine: marshals actions between the UI and the rendering engine.
• The rendering engine : responsible for displaying requested content. For example if the requested content is HTML, the rendering engine parses HTML and CSS, and displays the parsed content on the screen.
• Networking: for network calls such as HTTP requests, using different implementations for different platform behind a platform-independent interface.
• UI backend: used for drawing basic widgets like combo boxes and windows. This backend exposes a generic interface that is not platform specific. Underneath it uses operating system user interface methods.
• JavaScript interpreter: Used to parse and execute JavaScript code.
• Data storage: This is a persistence layer. The browser may need to save all sorts of data locally, such as cookies. Browsers also support storage mechanisms such as localStorage, IndexedDB, WebSQL and FileSystem.