HTTP requests from Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the library needed for HTTP requests.

Arduino

#include <[1]>

void setup() {
  Serial.begin(9600);
}

Drag options to blanks, or click blank then click option'

AWire.h

BWiFi.h

CSPI.h

DHTTPClient.h

Attempts:

3 left

💡 Hint

Common Mistakes

Including WiFi.h instead of HTTPClient.h

Forgetting to include any HTTP-related library

The HTTPClient.h library is needed to make HTTP requests from Arduino.

2fill in blank

medium

Complete the code to start an HTTP GET request to the URL.

Arduino

HTTPClient http;
http.begin("[1]");
int httpCode = http.GET();

Drag options to blanks, or click blank then click option'

ASerial.begin(9600)

Bhttp://example.com

Cdelay(1000)

DWiFi.begin()

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a function call instead of a URL string

Forgetting to put the URL in quotes

The http.begin() function needs the URL string to start the HTTP request.

3fill in blank

hard

Fix the error in reading the HTTP response payload.

Arduino

if (httpCode > 0) {
  String payload = http.[1]();
  Serial.println(payload);
}

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AgetResponse

BreadPayload

CgetString

DreadString

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent function like getResponse()

Using readString() which is not part of HTTPClient

The correct function to get the response body as a string is getString().

4fill in blank

hard

Fill both blanks to properly close the HTTP connection and free resources.

Arduino

http.[1]();
http.[2]();

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Aend

Bclose

Cdisconnect

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'close' or 'stop' which are not functions of HTTPClient

Not calling end() to free resources

The end() function closes the connection and frees resources. It should be called once after the request.

5fill in blank

hard

Fill all three blanks to create a dictionary of HTTP headers and print a specific header value.

Arduino

http.begin("http://example.com");
http.addHeader([1], [2]);
String headerValue = http.header([3]);
Serial.println(headerValue);

Drag options to blanks, or click blank then click option'

A"Content-Type"

B"application/json"

D"Authorization"

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong header keys or values

Mixing up the order of key and value in addHeader

You add a header with key "Content-Type" and value "application/json". Then you get the header value by key "Content-Type".