HTTP requests from Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of making HTTP requests from an Arduino?

To communicate with web servers or online services by sending or receiving data over the internet.

beginner

Which Arduino library is commonly used to make HTTP requests over WiFi?

The WiFiClient library combined with HTTPClient is commonly used for HTTP requests on WiFi-enabled Arduino boards.

intermediate

What is the basic sequence to perform an HTTP GET request on Arduino?

1. Connect to WiFi network.<br>2. Create an HTTPClient object.<br>3. Begin the request with the URL.<br>4. Send the GET request.<br>5. Read the response.<br>6. End the connection.

intermediate

Why is it important to call http.end() after an HTTP request?

Calling http.end() frees resources and closes the connection properly to avoid memory leaks and connection issues.

beginner

What is the difference between HTTP GET and POST requests on Arduino?

GET requests retrieve data from a server, while POST requests send data to the server, often used to submit form data or update information.

Which Arduino library helps you make HTTP requests over WiFi?

A HTTPClient

B Servo

C Wire

D SPI

HTTPClient is designed for making HTTP requests, while Servo, Wire, and SPI are for other hardware functions.

What function do you use to start an HTTP request with a URL in Arduino's HTTPClient?

A http.begin(url)

B http.start(url)

C http.open(url)

D http.connect(url)

The correct method to initialize the HTTP request is http.begin(url).

After sending an HTTP request, which function reads the response code?

A http.get()

B http.GET()

C http.getResponse()

D http.responseCode()

The http.GET() function sends the GET request and returns the response code.

Why should you call http.end() after an HTTP request?

A To start a new request

B To reset the Arduino board

C To free resources and close the connection

D To send data to the server

http.end() cleans up and closes the connection to avoid memory leaks.

Which HTTP method is used to send data to a server from Arduino?

A PUT

B GET

C DELETE

D POST

POST is used to send data to the server, while GET is for retrieving data.

Explain the steps to perform an HTTP GET request from an Arduino board.

Think about how you connect, ask for data, and then close the connection.

Describe the difference between HTTP GET and POST requests when used on Arduino.

One asks for information, the other sends information.