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MARP Rresentations

marp: true theme: gaia class: invert paginate: true title: "Understanding RESTful APIs" author: "Your Name" date: "CS PhD Seminar" style: | section { font-family: 'Arial, sans-serif'; color: #ddd; } h1, h2, h3 { color: #4CAF50; } .columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }

Understanding RESTful APIs

CS PhD Seminar

What is a RESTful API?

  • API (Application Programming Interface): A set of rules and protocols for building and interacting with software applications.
  • REST (Representational State Transfer): An architectural style for designing networked applications.
  • RESTful API: An API that adheres to the principles of REST.

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Principles of REST

  1. Statelessness
  2. Client-Server Architecture
  3. Cacheability
  4. Layered System
  5. Uniform Interface

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Statelessness

  • Each request from a client to a server must contain all the information needed to understand and process the request.
  • The server should not store any context about the client between requests.

Client-Server Architecture

  • The client and server operate independently.
  • The client makes requests, and the server processes them and returns the appropriate responses.

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Cacheability

  • Responses from the server should be explicitly labeled as cacheable or non-cacheable.
  • This allows clients to cache responses and reduce the need to make additional requests.

Layered System

  • A client cannot ordinarily tell whether it is connected directly to the end server or an intermediary.
  • This promotes scalability by allowing load balancing and shared caching.

Uniform Interface

  • Simplifies and decouples the architecture, which enables each part to evolve independently.
  • Key constraints:
    • Identification of resources (URI)
    • Manipulation of resources through representations (HTTP methods)
    • Self-descriptive messages
    • Hypermedia as the engine of application state (HATEOAS)

HTTP Methods in REST

GET

  • Retrieve data from a specified resource.
  • Example: GET /api/users

POST

  • Submit data to be processed to a specified resource.
  • Example: POST /api/users

PUT

  • Update a specified resource.
  • Example: PUT /api/users/1

DELETE

  • Delete a specified resource.
  • Example: DELETE /api/users/1

RESTful API Example

GET /api/books/1 HTTP/1.1
Host: example.com

Response:

{
  "id": 1,
  "title": "RESTful APIs",
  "author": "John Doe"
}

Advantages of RESTful APIs

  • Scalability: Stateless nature helps in scaling.
  • Flexibility: Can handle different types of calls and return different data formats.
  • Independence: Separation of client and server.

Disadvantages of RESTful APIs

  • Overhead: HTTP methods and headers add extra overhead.
  • Statelessness: Requires every request to be self-contained.
  • Complexity: Properly designing and documenting a RESTful API can be complex.

Conclusion

  • RESTful APIs are a powerful way to design web services that are scalable, flexible, and maintainable.
  • Understanding the principles and constraints of REST is crucial for designing effective APIs.

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Thank you!

Q&A

References


This presentation covers the fundamental aspects of RESTful APIs, using a dark theme and incorporating images, code snippets, and a two-column layout. This format should be engaging and informative for a group of CS PhD students.

---

---
marp: true
theme: gaia
class: invert
paginate: true
title: "Basic CSS Refresher"
author: "Your Name"
date: "CS PhD Seminar"
style: |
  section {
    font-family: 'Arial, sans-serif';
    color: #ddd;
  }
  h1, h2, h3 {
    color: #4CAF50;
  }
  code {
    background: #333;
    color: #eee;
    padding: 0.2em;
    border-radius: 5px;
  }
  .columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }
---

# Basic CSS Refresher

## CS PhD Seminar

---

# What is CSS?

- **CSS (Cascading Style Sheets)**: A language used to describe the presentation of a document written in HTML or XML.
- **Purpose**: CSS handles the visual and aural layout, including colors, fonts, and spacing.

![bg](https://via.placeholder.com/800x600)

---

# CSS Syntax

- **Selector**: Specifies the HTML element(s) to be styled.
- **Declaration Block**: Contains one or more declarations separated by semicolons.
- **Declaration**: Consists of a property and a value, separated by a colon.

```css
selector {
  property: value;
}

Selectors

  • Element Selector: Selects all elements of a given type.

    p {
  color: blue;
}

  • Class Selector: Selects elements with a specific class.

    .classname {
  color: green;
}

  • ID Selector: Selects an element with a specific ID.

    #idname {
  color: red;
}

Colors and Backgrounds

  • Color Property: Sets the text color.

    p {
  color: blue;
}

  • Background Color:

    body {
  background-color: #333;
}

  • Background Image:

    body {
  background-image: url('background.jpg');
}

Fonts and Text

  • Font Family:

    p {
  font-family: 'Arial, sans-serif';
}

  • Font Size:

    h1 {
  font-size: 2em;
}

  • Text Alignment:

    h1 {
  text-align: center;
}

Box Model

  • Content: The innermost part where text and images appear.
  • Padding: Clears an area around the content.
  • Border: Goes around the padding.
  • Margin: Clears an area outside the border.
div {
  padding: 20px;
  border: 5px solid #ccc;
  margin: 10px;
}

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Layout and Positioning

  • Display Property: Specifies how an element is displayed.

    .inline {
  display: inline;
}
.block {
  display: block;
}

  • Position Property: Specifies the type of positioning method.

    .relative {
  position: relative;
  top: 10px;
  left: 10px;
}
.absolute {
  position: absolute;
  top: 10px;
  left: 10px;
}

Flexbox

  • Container:

    .flex-container {
  display: flex;
}

  • Items:

    .flex-item {
  flex: 1;
}

bg right

Grid Layout

  • Container:

    .grid-container {
  display: grid;
  grid-template-columns: auto auto auto;
}

  • Items:

    .grid-item {
  padding: 20px;
}

Pseudo-classes and Pseudo-elements

  • Pseudo-class: Applies to elements based on their state.

    a:hover {
  color: red;
}

  • Pseudo-element: Styles specific parts of an element.

    p::first-line {
  color: blue;
}

Conclusion

  • CSS Basics: Essential for designing and styling web pages.
  • Selectors: Fundamental for targeting HTML elements.
  • Box Model: Crucial for layout and design.
  • Advanced Layouts: Flexbox and Grid offer powerful ways to create complex layouts.

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Thank you!

Q&A

References


This presentation covers the fundamental aspects of CSS, using a dark theme and incorporating images, code snippets, and a two-column layout. This format should be engaging and informative for a group of CS PhD students.