Computer Science
Grade 10
20 min
2. Types of APIs: RESTful APIs
Introduce different types of APIs, focusing on RESTful APIs and their principles.
What you'll learn
- Identify the key components of a RESTful API request (HTTP method, endpoint, headers, body) and response (status code, headers, body) in at least 3 different examples with 100% accuracy.
- Explain the purpose of each HTTP method (GET, POST, PUT, DELETE) commonly used in RESTful APIs and provide a real-world scenario where each would be appropriately applied with a clear justification.
- Apply knowledge of RESTful API principles to analyze a given API documentation excerpt and determine the correct HTTP method and endpoint required to retrieve specific data, achieving success in at least 2 out of 3 provided scenarios.
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Define REST and its role as an architectural style for APIs.
Identify the key components of a RESTful API request: the endpoint, HTTP method, and headers.
Differentiate between the four most common HTTP methods: GET, POST, PUT, and DELETE.
Explain the structure and purpose of JSON as a data format for API communication.
Construct a simple GET request URL to retrieve data from a specified endpoint.
Interpret a simple JSON response to extract specific pieces of information.
Ever wonder how your weather app instantly knows the temperature, or how a game displays your friend's high score? 🤔 Let's pull back the curtain on the magic that makes it happen!
This lesson introduces RESTful APIs, the most common type of API used on the web. You'll le...
2
Key Concepts & Vocabulary
TermDefinitionExample
REST (REpresentational State Transfer)An architectural style, or a set of rules, for designing networked applications. It's not a language, but a guide that makes communication between a client (like your browser) and a server (where data is stored) simple and standardized.Think of it like the standardized layout of a library. You know where to find the fiction section, the non-fiction section, and the front desk, making it easy to navigate and find what you need.
ResourceAny piece of information that an API can provide. In Object-Oriented Programming terms, you can think of a resource as an object or a collection of objects.In a social media API, a 'user', a 'post', or a 'comment' would each be a resource. A specific user like `use...
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Core Syntax & Patterns
RESTful URL Structure
Base URL + API Version + Resource Name
RESTful URLs are designed to be predictable. They start with the base address of the server, often include a version number (like /v1/), and end with the plural name of the resource you want to access.
HTTP Method Usage
GET: Read | POST: Create | PUT: Update | DELETE: Remove
This pattern, often called CRUD (Create, Read, Update, Delete), maps directly to HTTP methods. Always choose the method that semantically matches the action you want to perform on the resource.
JSON Syntax
Data is in key-value pairs. Keys are strings in double quotes. Values can be strings, numbers, booleans, arrays, or other objects.
When sending data (e.g., with POST or PUT) or receiving data, it must be formatted as valid JSON. A sin...
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Challenging
A social media API has an endpoint `https://api.social.com/v2/users/123/friends`. If a client sends a DELETE request to this endpoint, what is the most likely and logical outcome based on REST principles?
A.It deletes the user with ID 123.
B.It removes all friends associated with user 123.
C.It returns a list of all friends for user 123.
D.It deletes the entire `/friends` resource for all users.
Challenging
A developer needs to completely replace a user's profile at `/users/50` with a new set of data. Another developer wants to add a new photo to a user's album at `/users/50/photos`. Which HTTP methods are most appropriate for these two tasks, respectively?
A.PUT for replacing the profile; POST for adding a new photo.
B.POST for replacing the profile; PUT for adding a new photo.
C.PUT for both tasks.
D.POST for both tasks.
Challenging
A junior developer designs an API where getting a user is `GET /getUser?id=42` and deleting a user is `POST /deleteUser?id=42`. Based on REST principles, what is the primary critique of this design?
A.The API version is missing from the URL.
B.The use of query parameters (`?id=42`) is not allowed in REST.
C.The design is perfect and follows all RESTful conventions.
D.The URLs contain verbs ('get', 'delete') and the incorrect HTTP method is used for deletion.
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2. Types of APIs: RESTful APIs is a Grade 10 Computer Science lesson on ExcelOS.
What will I learn in 2. Types of APIs: RESTful APIs?
You'll be able to: Identify the key components of a RESTful API request (HTTP method, endpoint, headers, body) and response (status code, headers, body) in at least 3 different examples with 100% accuracy; Explain the purpose of each HTTP method….
Is "2. Types of APIs: RESTful APIs" free to practice?
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How many practice questions are included with 2. Types of APIs: RESTful APIs?
This lesson includes 25 practice questions across multiple difficulty levels, each with instant feedback and explanations.