Setting response headers in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the Content-Type header to 'application/json'.

Node.js

res.setHeader('Content-Type', [1]);

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

A'application/xml'

B'text/html'

C'text/plain'

D'application/json'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'text/html' instead of 'application/json' for JSON data.

Forgetting to put the header value in quotes.

The setHeader method sets the HTTP header. Here, we set the Content-Type to application/json to indicate JSON data.

2fill in blank

medium

Complete the code to set the 'Cache-Control' header to 'no-cache'.

Node.js

res.setHeader('Cache-Control', [1]);

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

A'private'

B'public'

C'no-cache'

D'max-age=3600'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'max-age=3600' which allows caching for 1 hour.

Using 'public' which allows caching by any cache.

The 'Cache-Control' header controls caching behavior. 'no-cache' tells browsers not to cache the response.

3fill in blank

hard

Fix the error in setting multiple headers by completing the method name.

Node.js

res.[1](200, {'Content-Type': 'text/html', 'X-Custom-Header': 'value'});

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

AwriteHead

BsetHeaders

CwriteHeaders

DsetHeader

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setHeader' which only sets one header at a time.

Using non-existent methods like 'setHeaders' or 'writeHeaders'.

The writeHead method sets multiple headers at once along with the status code.

4fill in blank

hard

Fill both blanks to set the status code to 404 and the Content-Type header to 'text/plain'.

Node.js

res.[1](404, [2]);

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

AwriteHead

B{'Content-Type': 'text/plain'}

C{'Content-Type': 'application/json'}

DsetHeader

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setHeader' which cannot set status code.

Passing headers as a string instead of an object.

writeHead sets the status code and headers together. Here, 404 means 'Not Found' and the content is plain text.

5fill in blank

hard

Fill all three blanks to set status 200, Content-Type 'application/json', and a custom header 'X-Powered-By' with value 'NodeJS'.

Node.js

res.setHeader([3], 'NodeJS'); res.[1](200, [2]);

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

AwriteHead

B{'Content-Type': 'application/json'}

C'X-Powered-By'

DsetHeader

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to set all headers with setHeader only.

Passing header names without quotes.

First, setHeader adds a custom header. Then, writeHead sets status and main headers.