Link headers for navigation in Rest API - Mini Project: Build & Apply

Link headers for navigation

📖 Scenario: You are building a simple REST API that returns a list of items. To help clients navigate through pages of results, you will add Link headers for navigation.

🎯 Goal: Create a REST API response with a Link header that includes URLs for the next and prev pages.

📋 What You'll Learn

Create a dictionary called items with keys page and data.

Create a variable called current_page set to 2.

Create a string variable called link_header that contains the Link header with next and prev URLs using current_page.

Print the link_header string.

💡 Why This Matters

🌍 Real World

Link headers help clients navigate pages of data in APIs, like moving between pages of search results or product lists.

💼 Career

Understanding how to create and use Link headers is important for backend developers building REST APIs that support pagination.

1

DATA SETUP: Create the items dictionary

Create a dictionary called items with the keys page set to 1 and data set to a list of strings ["item1", "item2", "item3"].

Rest API

# Your code here

Need a hint?

Use curly braces to create a dictionary with the keys and values exactly as shown.

2

CONFIGURATION: Set the current page number

Create a variable called current_page and set it to the integer 2.

Rest API

items = {"page": 1, "data": ["item1", "item2", "item3"]}
# Your code here

Need a hint?

Just assign the number 2 to the variable current_page.

3

CORE LOGIC: Create the Link header string

Create a string variable called link_header that contains the Link header with URLs for the next page (which is current_page + 1) and the prev page (which is current_page - 1). Use the format: <http://api.example.com/items?page=X>; rel="next", <http://api.example.com/items?page=Y>; rel="prev" where X and Y are the page numbers.

Rest API

items = {"page": 1, "data": ["item1", "item2", "item3"]}
current_page = 2
# Your code here

Need a hint?

Use an f-string to insert the page numbers into the URLs inside angle brackets, followed by rel="next" and rel="prev".

4

OUTPUT: Print the Link header

Write a print statement to display the value of the link_header variable.

Rest API

items = {"page": 1, "data": ["item1", "item2", "item3"]}
current_page = 2
link_header = f'; rel="next", ; rel="prev"'
# Your code here

Need a hint?

Use print(link_header) to show the navigation links.