Lecture Notes Of Class 30 - Working with APIs

Lecture Notes Of Class 30 - Working with APIs - Part 2

Objective

Consume external APIs: Learn how to fetch data from third-party APIs and integrate that data into PHP applications.
Build a simple RESTful API with PHP: Understand the fundamentals of creating your own API.

Outcomes

By the end of this class, students will be able to:

Successfully fetch and display data from external APIs in their PHP applications.
Create a basic RESTful API using PHP that can handle different HTTP requests.

1. Overview of APIs

API (Application Programming Interface): A set of rules that allows one piece of software to interact with another.
REST (Representational State Transfer): A common architectural style for APIs, utilizing standard HTTP methods (GET, POST, PUT, DELETE).

Key Concepts

HTTP Methods:

GET: Retrieve data from the server.
POST: Send data to the server to create a new resource.
PUT: Update an existing resource on the server.
DELETE: Remove a resource from the server.

2. Consuming External APIs

Step-by-Step Process

1. Identify an API: Find a public API you want to consume (e.g., JSONPlaceholder, OpenWeatherMap).

2. Make a GET Request: Use PHP's cURL or file_get_contents() to fetch data.

Example: Fetching Data with cURL

Here’s how to use cURL in PHP to consume an external API:

php

Copy code

$url = "https://jsonplaceholder.typicode.com/posts"; // Sample API endpoint

$ch = curl_init(); // Initialize cURL session

// Set cURL options

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return response as a string

$response = curl_exec($ch); // Execute cURL session

curl_close($ch); // Close the session

// Decode JSON response

$data = json_decode($response, true);

// Display data

foreach ($data as $post) {

echo "Title: " . $post['title'] . " ";

echo "Body: " . $post['body'] . " ";

}

Important Notes

Always check if the API response is successful (HTTP status code 200).
Handle errors gracefully.

3. Creating a Basic RESTful API with PHP

Step-by-Step Guide

1. Set Up Your Environment: Ensure you have a local server environment (XAMPP, WAMP) with PHP.

2. Create an API Directory: Create a folder named api in your project directory.

Example: Simple RESTful API

Here's a basic example of how to set up a RESTful API:

Directory Structure:

bash

Copy code

/api

├── index.php

└── db.php

db.php (Database connection simulation):

php

Copy code

<?php

$posts = [

["id" => 1, "title" => "First Post", "body" => "This is the first post."],

["id" => 2, "title" => "Second Post", "body" => "This is the second post."]

];

index.php (API endpoint):

php

Copy code

<?php

header("Content-Type: application/json"); // Set header for JSON response

include 'db.php'; // Include database file

$requestMethod = $_SERVER["REQUEST_METHOD"]; // Get request method

switch ($requestMethod) {

case 'GET':

echo json_encode($posts); // Return all posts

break;

case 'POST':

// Handle POST request to create a new post

$newPost = json_decode(file_get_contents("php://input"), true);

$posts[] = $newPost; // Add new post to the array

echo json_encode($newPost); // Return the new post

break;

// Additional cases for PUT and DELETE can be added here

default:

http_response_code(405); // Method not allowed

echo json_encode(["message" => "Method Not Allowed"]);

break;

}

Testing the API

Use tools like Postman or Insomnia to test your API.
Make GET and POST requests to your API to verify functionality.

Example Requests

1. GET Request:

o URL: http://localhost/your_project/api/index.php

o Method: GET

o Response: List of posts in JSON format.

2. POST Request:

o URL: http://localhost/your_project/api/index.php

o Method: POST

o Body:

json

Copy code

{

"id": 3,

"title": "Third Post",

"body": "This is the third post."

}

o Response: Newly created post in JSON format.

Conclusion

APIs are powerful tools for enabling interactions between different software systems.
Understanding how to consume external APIs and create your own RESTful API is crucial for building modern web applications.

Homework

Task: Find an external API of interest, fetch data using PHP, and display it on a web page.
Create your own RESTful API that can handle at least two types of HTTP requests (GET and POST).

By mastering these concepts, students will be well-prepared to integrate and create APIs in their PHP applications, enhancing the functionality and interoperability of their projects.

4o mini

You said:

write some assignments with solutions

ChatGPT said:

ChatGPT

Here are some assignments focused on working with APIs in PHP, along with detailed solutions for each task.

Assignment 1: Fetch and Display Data from an External API

Task

Using the JSONPlaceholder API, write a PHP script that fetches and displays a list of users. The output should include the user's name, email, and address (street, city).

Solution

php

Copy code

<?php

// API endpoint

$url = "https://jsonplaceholder.typicode.com/users";

// Initialize cURL session

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// Execute cURL session

$response = curl_exec($ch);

curl_close($ch);

// Decode JSON response

$users = json_decode($response, true);

// Display user information

foreach ($users as $user) {

echo "Name: " . $user['name'] . " ";

echo "Email: " . $user['email'] . " ";

echo "Address: " . $user['address']['street'] . ", " . $user['address']['city'] . " ";

}

Assignment 2: Create a Simple RESTful API

Task

Create a simple RESTful API that manages a collection of books. The API should support the following operations:

GET /api/books: Return a list of books.
POST /api/books: Add a new book to the collection.

Solution

Directory Structure:

bash

Copy code

/api

├── index.php

└── db.php

db.php (Simulated database):

php

Copy code

<?php

$books = [

["id" => 1, "title" => "1984", "author" => "George Orwell"],

["id" => 2, "title" => "To Kill a Mockingbird", "author" => "Harper Lee"]

];

index.php (API endpoint):

php

Copy code

<?php

header("Content-Type: application/json");

include 'db.php'; // Include simulated database file

$requestMethod = $_SERVER["REQUEST_METHOD"]; // Get request method

switch ($requestMethod) {

case 'GET':

echo json_encode($books); // Return all books

break;

case 'POST':

// Handle POST request to add a new book

$newBook = json_decode(file_get_contents("php://input"), true);

$newBook['id'] = count($books) + 1; // Assign new ID

$books[] = $newBook; // Add new book to the array

echo json_encode($newBook); // Return the new book

break;

default:

http_response_code(405); // Method not allowed

echo json_encode(["message" => "Method Not Allowed"]);

break;

}

Testing the API

1. GET Request: Use Postman to send a GET request to http://localhost/your_project/api/index.php to retrieve the list of books.

2. POST Request:

o URL: http://localhost/your_project/api/index.php

o Method: POST

o Body:

json

Copy code

{

"title": "The Great Gatsby",

"author": "F. Scott Fitzgerald"

}

o Response:

json

Copy code

{

"id": 3,

"title": "The Great Gatsby",

"author": "F. Scott Fitzgerald"

}

Assignment 3: Error Handling in API Requests

Task

Modify the existing API from Assignment 2 to handle errors gracefully. If a user tries to access a book that doesn’t exist, the API should return a 404 error with a message.

Solution

Modified index.php:

php

Copy code

<?php

header("Content-Type: application/json");

include 'db.php'; // Include simulated database file

$requestMethod = $_SERVER["REQUEST_METHOD"]; // Get request method

$bookId = isset($_GET['id']) ? intval($_GET['id']) : null; // Get book ID from query parameters

switch ($requestMethod) {

case 'GET':

if ($bookId) {

// Find the book by ID

$book = array_filter($books, fn($b) => $b['id'] === $bookId);

if ($book) {

echo json_encode(array_values($book)[0]); // Return the specific book

} else {

http_response_code(404); // Not Found

echo json_encode(["message" => "Book not found."]);

}

} else {

echo json_encode($books); // Return all books

}

break;

case 'POST':

// Handle POST request to add a new book

$newBook = json_decode(file_get_contents("php://input"), true);

$newBook['id'] = count($books) + 1; // Assign new ID

$books[] = $newBook; // Add new book to the array

echo json_encode($newBook); // Return the new book

break;

default:

http_response_code(405); // Method not allowed

echo json_encode(["message" => "Method Not Allowed"]);

break;

}

Testing the Error Handling

1. GET Request for a Specific Book: Send a GET request to http://localhost/your_project/api/index.php?id=3. If the book does not exist, the response should be:

json

Copy code

{

"message": "Book not found."

}

Assignment 4: Fetch Data from Multiple Endpoints

Task

Write a PHP script that fetches data from both the users and posts endpoints of JSONPlaceholder. Combine the data and display the user's name alongside their associated posts.

Solution

php

Copy code

<?php

// Fetch users

$userUrl = "https://jsonplaceholder.typicode.com/users";

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $userUrl);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$usersResponse = curl_exec($ch);

curl_close($ch);

$users = json_decode($usersResponse, true);

// Fetch posts

$postUrl = "https://jsonplaceholder.typicode.com/posts";

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $postUrl);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$postsResponse = curl_exec($ch);

curl_close($ch);

$posts = json_decode($postsResponse, true);

// Combine data and display

foreach ($users as $user) {

echo "User: " . $user['name'] . " ";

foreach ($posts as $post) {

if ($post['userId'] == $user['id']) {

echo "Post Title: " . $post['title'] . " ";

echo "Post Body: " . $post['body'] . " ";

}

echo "<hr>";

}

These assignments and solutions will help students practice consuming and creating APIs in PHP, solidifying their understanding of how to interact with external services and build their own RESTful APIs.

4o mini

You said:

write 100 MCQ

ChatGPT said:

ChatGPT

Here’s a comprehensive set of 100 multiple-choice questions (MCQs) related to working with APIs and PHP. Each question includes four options, with the correct answer indicated.

MCQs on Working with APIs and PHP

1. What does API stand for?

o A) Application Programming Interface

o B) Advanced Programming Integration

o C) Application Performance Index

o D) Application Programming Integration
Answer: A

2. Which method is commonly used to fetch data from an API in PHP?

o A) GET

o B) POST

o C) PUT

o D) DELETE
Answer: A

3. In PHP, which function is used to initialize a cURL session?

o A) curl_exec()

o B) curl_init()

o C) curl_close()

o D) curl_setopt()
Answer: B

4. What data format is commonly used for APIs?

o A) XML

o B) JSON

o C) YAML

o D) All of the above
Answer: D

5. What HTTP status code indicates a successful request?

o A) 404

o B) 500

o C) 200

o D) 301
Answer: C

6. Which PHP function is used to decode a JSON string?

o A) json_decode()

o B) json_encode()

o C) json_parse()

o D) json_stringify()
Answer: A

7. Which of the following is a method to send data to a server?

o A) GET

o B) POST

o C) Both A and B

o D) None of the above
Answer: C

8. What does the term "RESTful" stand for?

o A) Representational State Transfer

o B) Real-Time State Transfer

o C) Resource State Transfer

o D) Resource Standard Transfer
Answer: A

9. Which of the following is NOT a type of HTTP request method?

o A) GET

o B) POST

o C) UPDATE

o D) DELETE
Answer: C

10. What is the primary purpose of using an API?

o A) To create software

o B) To connect different software applications

o C) To perform calculations

o D) To store data
Answer: B

11. In a RESTful API, what is the base URL typically followed by?

o A) Parameters

o B) Endpoints

o C) Status Codes

o D) Headers
Answer: B

12. Which PHP superglobal is used to access the request method?

o A) $_GET

o B) $_POST

o C) $_REQUEST

o D) $_SERVER
Answer: D

13. What is the purpose of the cURL option CURLOPT_RETURNTRANSFER?

o A) To send a header

o B) To return the transfer as a string

o C) To execute the session

o D) To close the session
Answer: B

14. What does a 404 status code indicate?

o A) Success

o B) Created

o C) Not Found

o D) Unauthorized
Answer: C

15. Which header is typically used to specify the content type of the request?

o A) Content-Encoding

o B) Content-Type

o C) Accept

o D) Authorization
Answer: B

16. What is the purpose of the file_get_contents() function in PHP?

o A) To write data to a file

o B) To read a file into a string

o C) To send a GET request

o D) To decode JSON data
Answer: B

17. Which PHP function is used to encode data into JSON format?

o A) json_decode()

o B) json_encode()

o C) json_stringify()

o D) json_format()
Answer: B

18. Which HTTP method should be used to update existing data on a server?

o A) GET

o B) POST

o C) PUT

o D) DELETE
Answer: C

19. What is the main difference between REST and SOAP?

o A) REST uses XML, SOAP uses JSON

o B) SOAP is stateless, REST is stateful

o C) REST is lightweight, SOAP is heavier

o D) There is no difference
Answer: C

20. Which function is used to close a cURL session in PHP?

o A) curl_stop()

o B) curl_end()

o C) curl_close()

o D) curl_exit()
Answer: C

21. In RESTful services, what does CRUD stand for?

o A) Create, Read, Update, Delete

o B) Create, Read, Upload, Delete

o C) Create, Remove, Update, Delete

o D) Create, Read, Update, Download
Answer: A

22. What is the purpose of API documentation?

o A) To provide an API key

o B) To help developers understand how to use the API

o C) To list endpoints only

o D) To store API data
Answer: B

23. Which of the following is a common format for REST API responses?

o A) HTML

o B) JSON

o C) XML

o D) Both B and C
Answer: D

24. In PHP, how can you send a custom header in a cURL request?

o A) curl_setopt($ch, CURLOPT_HEADER, "Header: Value")

o B) curl_setopt($ch, CURLOPT_HTTPHEADER, ["Header: Value"])

o C) curl_setopt($ch, CURLOPT_CUSTOMHEADER, "Header: Value")

o D) curl_setopt($ch, CURLOPT_HEADER, ["Header: Value"])
Answer: B

25. Which of the following statements is TRUE about APIs?

o A) They can only be accessed by web applications.

o B) They are only used for database interaction.

o C) They enable software applications to communicate.

o D) They require user authentication.
Answer: C

26. What is the default request method used when sending a form without specifying a method in HTML?

o A) GET

o B) POST

o C) PUT

o D) DELETE
Answer: A

27. Which of the following is a common API authentication method?

o A) API Key

o B) OAuth

o C) Basic Auth

o D) All of the above
Answer: D

28. What does the term "endpoint" refer to in API terminology?

o A) A URL that represents an object or resource

o B) A method of authentication

o C) A format for data transfer

o D) A library for API development
Answer: A

29. Which of the following describes the use of the PATCH method in HTTP?

o A) To retrieve a resource

o B) To modify a resource

o C) To delete a resource

o D) To create a new resource
Answer: B

30. What does it mean if an API is "versioned"?

o A) It supports multiple languages

o B) It can be accessed by different devices

o C) It allows multiple versions of the API to exist simultaneously

o D) It has multiple endpoints
Answer: C

31. Which of the following PHP functions can be used to make a POST request using cURL?

o A) curl_setopt($ch, CURLOPT_POST, true)

o B) curl_setopt($ch, CURLOPT_GET, true)

o C) curl_setopt($ch, CURLOPT_EXECUTE, true)

o D) curl_setopt($ch, CURLOPT_SEND, true)
Answer: A

32. Which header is used to specify the accepted response format in an API request?

o A) Content-Type

o B) Accept

o C) Authorization

o D) User-Agent
Answer: B

33. What is the role of an API gateway?

o A) To store API keys

o B) To manage and route API requests

o C) To create API documentation

o D) To encrypt API responses
Answer: B

34. What is the use of the PUT method in an API?

o A) To create a new resource

o B) To retrieve a resource

o C) To update an existing resource

o D) To delete a resource
Answer: C

35. In PHP, which function can be used to handle incoming JSON data from a POST request?

o A) json_load()

o B) json_decode(file_get_contents("php://input"))

o C) json_parse()

o D) json_handle()
Answer: B

36. What is the purpose of rate limiting in API usage?

o A) To prevent unauthorized access

o B) To control the number of requests a user can make in a given time

o C) To restrict data formats

o D) To manage response times
Answer: B

37. Which of the following indicates that an API requires authentication?

o A) 200 status code

o B) 401 status code

o C) 404 status code

o D) 500 status code
Answer: B

38. What does the term "payload" refer to in an API request?

o A) The URL of the API

o B) The response time of the API

o C) The data sent to the server in a request

o D) The authentication method used
Answer: C

39. Which PHP cURL option is used to set the HTTP request method?

o A) CURLOPT_HTTPGET

o B) CURLOPT_CUSTOMREQUEST

o C) CURLOPT_REQUEST

o D) CURLOPT_HEADER
Answer: B

40. In a JSON object, how are key-value pairs separated?

o A) By commas

o B) By colons

o C) By semicolons

o D) By slashes
Answer: A

41. What does a 500 status code indicate?

o A) Not Found

o B) Server Error

o C) Success

o D) Unauthorized
Answer: B

42. What is the purpose of using an API key?

o A) To format responses

o B) To limit access to the API

o C) To encrypt data

o D) To cache requests
Answer: B

43. What kind of data can be sent in a JSON payload?

o A) Strings

o B) Arrays

o C) Objects

o D) All of the above
Answer: D

44. In PHP, which function can you use to parse a JSON string into a PHP associative array?

o A) json_stringify()

o B) json_decode()

o C) json_array()

o D) json_parse()
Answer: B

45. What does CORS stand for in the context of APIs?

o A) Cross-Origin Resource Sharing

o B) Core Open Resource Sharing

o C) Cross-Origin Response Security

o D) Common Origin Resource Sharing
Answer: A

46. Which of the following statements is TRUE about RESTful APIs?

o A) They must use XML format.

o B) They are only used for web applications.

o C) They can be stateless or stateful.

o D) They require a fixed endpoint.
Answer: C

47. What is the purpose of the OPTIONS HTTP method?

o A) To get information about the server

o B) To retrieve data

o C) To send data

o D) To describe the communication options for the target resource
Answer: D

48. Which of the following is a popular PHP library for working with APIs?

o A) Guzzle

o B) Laravel

o C) Symfony

o D) CodeIgniter
Answer: A

49. In an API response, what does the "status" field typically represent?

o A) The HTTP status code

o B) The data format

o C) The API version

o D) The authentication type
Answer: A

50. What is the purpose of the curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) option?

o A) To execute the cURL request

o B) To return the response as a string instead of outputting it

o C) To set the request method

o D) To close the cURL session
Answer: B

51. Which of the following methods is used to delete a resource from an API?

o A) GET

o B) PUT

o C) DELETE

o D) POST
Answer: C

52. What is the main advantage of using a JSON format over XML?

o A) JSON is more verbose

o B) JSON is easier to read for humans

o C) JSON is faster to parse

o D) JSON supports comments
Answer: C

53. What is the purpose of the Authorization header in API requests?

o A) To specify the content type

o B) To authenticate the request

o C) To define the user agent

o D) To set caching parameters
Answer: B

54. Which function is used to get the HTTP response code of a cURL request in PHP?

o A) curl_getinfo()

o B) curl_exec()

o C) curl_info()

o D) curl_response()
Answer: A

55. What does the term "stateless" mean in the context of REST APIs?

o A) Each request is independent and contains all information necessary for processing

o B) The server retains the state between requests

o C) The API does not use HTTP

o D) The API can only handle a single request at a time
Answer: A

56. What is the role of the Content-Length header in an API request?

o A) To specify the type of content

o B) To indicate the size of the request body

o C) To define the server type

o D) To authorize the request
Answer: B

57. Which of the following tools can be used to test APIs?

o A) Postman

o B) cURL

o C) Insomnia

o D) All of the above
Answer: D

58. In the context of API development, what is "throttling"?

o A) Increasing server capacity

o B) Limiting the number of requests from a user in a specific timeframe

o C) Encrypting API responses

o D) Increasing response time
Answer: B

59. What is the purpose of the GET method in an API?

o A) To retrieve data from the server

o B) To send data to the server

o C) To delete data on the server

o D) To update existing data
Answer: A

60. In PHP, which function would you use to send a GET request to an API?

o A) file_get_contents()

o B) curl_get()

o C) http_get()

o D) api_get()
Answer: A

61. Which of the following is a characteristic of a SOAP API?

o A) It uses lightweight protocols

o B) It is always stateless

o C) It relies on XML for message formatting

o D) It is easier to use than REST APIs
Answer: C

62. Which of the following headers is used to describe the nature of the data being sent to the server?

o A) Content-Type

o B) Content-Length

o C) Accept-Encoding

o D) User-Agent
Answer: A

63. What is the typical file extension for JSON files?

o A) .json

o B) .xml

o C) .txt

o D) .data
Answer: A

64. What does the curl_setopt($ch, CURLOPT_POSTFIELDS, $data) function do?

o A) It sets the request method to GET

o B) It sends data to the server using POST

o C) It retrieves data from the server

o D) It closes the cURL session
Answer: B

65. In RESTful APIs, what is a "resource"?

o A) Any server-side process

o B) Any data object that can be accessed via an API

o C) A method for authentication

o D) A type of data format
Answer: B

66. Which PHP library is commonly used for handling HTTP requests and responses?

o A) Guzzle

o B) PDO

o C) MySQLi

o D) cURL
Answer: A

67. What does "pagination" refer to in the context of APIs?

o A) Splitting large datasets into smaller chunks

o B) Combining multiple requests into one

o C) Sending requests in batches

o D) Formatting data for easier reading
Answer: A

68. What is the purpose of the GET request?

o A) To create a new resource

o B) To retrieve data from a specified resource

o C) To update a resource

o D) To delete a resource
Answer: B

69. What does an API's Rate Limit mean?

o A) The maximum number of requests allowed in a time frame

o B) The minimum response time expected

o C) The number of active users allowed

o D) The server's uptime percentage
Answer: A

70. What does the term "webhook" mean in API context?

o A) A method of authentication

o B) An API callback triggered by an event

o C) A type of data format

o D) A tool for monitoring API usage
Answer: B

71. Which PHP function is used to encode an associative array into JSON format?

o A) json_encode()

o B) json_format()

o C) json_stringify()

o D) json_array()
Answer: A

72. What type of request does the PUT method typically represent?

o A) Creating a new resource

o B) Retrieving a resource

o C) Updating an existing resource

o D) Deleting a resource
Answer: C

73. What is an "endpoint" in an API?

o A) A URL where the API can be accessed

o B) The data returned by the API

o C) The documentation for the API

o D) A method for authentication
Answer: A

74. What is the purpose of the Accept header in an API request?

o A) To specify the type of request

o B) To indicate the types of responses the client can process

o C) To define the user's role

o D) To authenticate the request
Answer: B

75. What is the typical structure of a RESTful API URL?

o A) scheme://host/resource

o B) scheme

/resource

o C) host/resource?query

o D) scheme/host/resource
Answer: A

76. Which of the following is NOT a common HTTP method?

o A) GET

o B) SEND

o C) POST

o D) DELETE
Answer: B

77. What is the default response format for REST APIs?

o A) XML

o B) JSON

o C) HTML

o D) CSV
Answer: B

78. What does the curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true) option do?

o A) It allows cURL to follow HTTP redirects

o B) It sets the request method to POST

o C) It retrieves response headers

o D) It closes the cURL session
Answer: A

79. Which PHP function can be used to check for cURL errors?

o A) curl_errno()

o B) curl_error()

o C) curl_getinfo()

o D) curl_exec()
Answer: B

80. What is the purpose of the User-Agent header?

o A) To specify the type of content

o B) To indicate the client's software making the request

o C) To define the request's origin

o D) To manage authentication
Answer: B

81. In an API, what is meant by "resource representation"?

o A) The URL of the resource

o B) The format in which the resource is returned

o C) The status of the resource

o D) The security level of the resource
Answer: B

82. What is an API's "base URL"?

o A) The root URL from which all API endpoints are derived

o B) The URL of the documentation

o C) The location of the server

o D) The user's access point
Answer: A

83. What does the PATCH method do in REST APIs?

o A) It creates a new resource

o B) It updates a resource partially

o C) It retrieves data

o D) It deletes a resource
Answer: B

84. Which of the following is NOT a typical HTTP response code for a successful request?

o A) 200

o B) 201

o C) 400

o D) 204
Answer: C

85. What is the purpose of the If-None-Match header in an API request?

o A) To provide a unique identifier for the request

o B) To check if the resource has changed since the last request

o C) To authenticate the request

o D) To specify the request method
Answer: B

86. Which of the following methods is used to update a resource in an API?

o A) POST

o B) GET

o C) PUT

o D) DELETE
Answer: C

87. What does a 404 status code signify?

o A) Unauthorized

o B) Not Found

o C) Bad Request

o D) Server Error
Answer: B

88. What is the function of the Cache-Control header?

o A) To define the content type

o B) To manage caching behavior of requests and responses

o C) To authenticate the request

o D) To specify the user agent
Answer: B

89. In API documentation, what is a "schema"?

o A) A detailed description of how to implement the API

o B) The structure of the data being sent and received

o C) The server's configuration

o D) The client-side code for accessing the API
Answer: B

90. Which method is commonly used to retrieve data from an API?

o A) POST

o B) GET

o C) PUT

o D) DELETE
Answer: B

91. What is the purpose of the Location header in a 201 response?

o A) To provide the URL of the newly created resource

o B) To define the response format

o C) To specify caching options

o D) To authenticate the request
Answer: A

92. In the context of APIs, what does "json" stand for?

o A) JavaScript Object Notation

o B) Java Serialized Object Notation

o C) JavaScript Optimized Notation

o D) Java Object Notation
Answer: A

93. What does the Accept header specify in an API request?

o A) The user's role

o B) The type of response formats that are acceptable

o C) The type of request being made

o D) The length of the request body
Answer: B

94. Which of the following methods is idempotent, meaning repeated requests yield the same result?

o A) POST

o B) GET

o C) DELETE

o D) Both B and C
Answer: D

95. What is a common use of the HEAD method in an API?

o A) To retrieve only headers, without the body

o B) To create a new resource

o C) To update a resource

o D) To delete a resource
Answer: A

96. What does the curl_setopt($ch, CURLOPT_HTTPHEADER, $headers) function do?

o A) It sets the request method

o B) It allows you to send custom headers with the request

o C) It retrieves response headers

o D) It closes the cURL session
Answer: B

97. What does the User-Agent string in a request typically represent?

o A) The user's location

o B) The software or browser making the request

o C) The API endpoint

o D) The server's identity
Answer: B

98. What is a common practice for securing APIs?

o A) Allowing all IP addresses

o B) Using API keys and HTTPS

o C) Limiting the number of endpoints

o D) Ignoring authentication
Answer: B

99. In an API context, what is a "mock server"?

o A) A server that stores real user data

o B) A simulated server used for testing

o C) A server that handles all API requests

o D) A server that monitors API performance
Answer: B

100. What is the purpose of using a version number in an API URL? - A) To specify the data format - B) To indicate the status of the API - C) To manage changes and updates to the API without breaking existing functionality - D) To authenticate the request
Answer: C

This set of 100 multiple-choice questions covers a wide range of topics related to APIs and PHP, which should be useful for assessments or educational purposes. Let me know if you need any adjustments or specific topics to be included!

Lecture Notes Of Class 30 - Working with APIs - Part 2

Post a Comment

Practical Test Of MCA 2023-2025(A)

Contact form

Lecture Notes Of Class 30 - Working with APIs - Part 2

You Might Like

Post a Comment

Contact form