If-None-Match and 304 responses in Rest API - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the client's ETag matches the server's ETag.

Rest API

if request.headers.get('If-None-Match') == [1]:
    return '', 304

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

Aserver_etag

Bclient_etag

Cetag_value

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using the client's ETag variable instead of the server's ETag for comparison.

Comparing to None instead of the server's ETag.

The server compares the client's If-None-Match header with its own server_etag to decide if the resource has changed.

2fill in blank

medium

Complete the code to set the ETag header in the server's response.

Rest API

response.headers['ETag'] = [1]

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

Aserver_etag

BNone

Cetag_value

Dclient_etag

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the ETag header to the client's ETag value.

Leaving the ETag header unset.

The server sets the ETag header to its current resource version server_etag so clients can cache it.

3fill in blank

hard

Fix the error in the code that returns a 304 response when ETags match.

Rest API

if request.headers.get('If-None-Match') == [1]:
    return '', 304

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

Aetag_value

Bclient_etag

Cserver_etag

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Returning 200 instead of 304 when ETags match.

Comparing to the wrong ETag variable.

The code should return a 304 status code (Not Modified) when the ETags match, not 200.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps resource IDs to their ETags only if the ETag length is greater than 10.

Rest API

etag_map = {resource_id: [1] for resource_id, [2] in resources.items() if len(etag) > 10}

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

Aetag

Betag_value

Dresource_etag

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names for ETag in the comprehension.

Using the wrong variable in the if condition.

The comprehension maps resource_id to etag for each resource where the ETag length is greater than 10.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase resource IDs to their ETags only if the ETag starts with 'W/'.

Rest API

etag_map = { [1]: [2] for resource_id, etag in resources.items() if etag.[3]('W/') }

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

Aresource_id.upper()

Betag

Cstartswith

Dendswith

Attempts:

3 left

💡 Hint

Common Mistakes

Using endswith instead of startswith.

Not converting resource IDs to uppercase.

The comprehension maps uppercase resource_id to etag only if the ETag starts with 'W/'.