HTTP triggered functions in GCP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an HTTP triggered Cloud Function in Python.

GCP

def hello_world(request):
    return [1]('Hello, World!')

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

AResponse

Bstr

Cmake_response

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of returning a response

Returning a plain string without wrapping in a response

The function must return a proper HTTP response. make_response creates a valid HTTP response object.

2fill in blank

medium

Complete the code to extract a query parameter named 'name' from the HTTP request.

GCP

def greet(request):
    name = request.args.get([1], 'Guest')
    return f'Hello, {name}!'

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

A'user'

B'name'

C'id'

D'guest'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong parameter name

Forgetting to provide a default value

The query parameter to extract is named 'name'. Using request.args.get('name') retrieves it.

3fill in blank

hard

Fix the error in the code to correctly handle JSON data from the HTTP POST request.

GCP

def process_json(request):
    data = request.[1]
    return f"Received: {data['message']}"

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

Aget_json

Bjson

Cjson_data

Djson()

Attempts:

3 left

💡 Hint

Common Mistakes

Calling get_json() on request.json which is already parsed

Using incorrect attribute names

The request object has a get_json() method that parses the JSON data. Using request.json is also valid but here the correct fix is to use get_json().

4fill in blank

hard

Fill both blanks to create a Cloud Function that returns a JSON response with a status code 200.

GCP

from flask import jsonify, make_response

def json_response(request):
    data = {'message': 'Success'}
    response = make_response([1](data), [2])
    return response

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

Ajsonify

B404

C200

Djson

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong status code

Not converting data to JSON properly

jsonify converts the dictionary to a JSON response. The status code 200 means success.

5fill in blank

hard

Fill all three blanks to create a Cloud Function that reads a JSON field 'name', returns a greeting, and sets content type.

GCP

from flask import make_response, jsonify

def greet_user(request):
    data = request.[1]
    name = data.get([2], 'Guest')
    response = make_response(jsonify({'greeting': f'Hello, {name}!'}))
    response.headers['[3]'] = 'application/json'
    return response

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

Ajson

B'name'

CContent-Type

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using request.args instead of request.json

Forgetting to set the content type header

Using wrong key names

request.json accesses JSON data. The key to get is 'name'. The header to set content type is 'Content-Type'.

Practice

1. What happens when an HTTP triggered function in GCP receives a web request?

easy

A. The function only logs the request but does not respond.

B. The function stores the request without running any code.

C. The function runs the code and sends back a response.

D. The function waits for a manual trigger to run.

Solution

1. Step 1: Understand the trigger type

   HTTP triggered functions run automatically when they receive a web request.

2. Step 2: Identify the function behavior

   They process the request and return a response to the caller.

3. Final Answer:

   The function runs the code and sends back a response. -> Option C

4. Quick Check:

   HTTP trigger = runs code + responds [OK]

Hint: HTTP trigger means code runs on web request [OK]

Common Mistakes:

• Thinking the function only logs requests
• Assuming manual trigger is needed
• Believing the function stores requests without running

2. Which of the following is the correct way to define an HTTP triggered function in Python for GCP Cloud Functions?

easy

A. def my_function(data, context):

B. def my_function(event, context):

C. def my_function():

D. def my_function(request):

Solution

1. Step 1: Recall function signature for HTTP triggers

   HTTP triggered functions accept a single 'request' parameter representing the web request.

2. Step 2: Match the correct signature

   Only 'def my_function(request):' matches this pattern.

3. Final Answer:

   def my_function(request): -> Option D

4. Quick Check:

   HTTP function signature = def func(request) [OK]

Hint: HTTP functions take one 'request' parameter [OK]

Common Mistakes:

• Using event and context parameters (for background triggers)
• Defining function without parameters
• Using wrong parameter names

3. Given this Python HTTP function code snippet, what will be the HTTP response body when a GET request is made?

def hello_world(request):
    if request.method == 'GET':
        return 'Hello, World!'
    else:
        return 'Unsupported method', 405

medium

A. "Hello, World!"

B. "Unsupported method"

C. Error: Missing return statement

D. Empty response

Solution

1. Step 1: Check the request method

   The function checks if the request method is 'GET'.

2. Step 2: Determine response for GET

   For 'GET', it returns the string 'Hello, World!'.

3. Final Answer:

   "Hello, World!" -> Option A

4. Quick Check:

   GET request returns greeting [OK]

Hint: GET request returns 'Hello, World!' string [OK]

Common Mistakes:

• Confusing method names case sensitivity
• Expecting a JSON response without formatting
• Ignoring else branch

4. Identify the error in this HTTP triggered function code snippet:

def process_request(request):
    if request.method == 'POST'
        return 'Received POST'
    else:
        return 'Only POST allowed', 405

medium

A. Missing colon ':' after if statement

B. Incorrect return type for HTTP function

C. Wrong parameter name for request

D. No error in the code

Solution

1. Step 1: Check syntax of if statement

   The if statement is missing a colon ':' at the end.

2. Step 2: Confirm syntax error impact

   Without the colon, the code will cause a syntax error and fail to deploy.

3. Final Answer:

   Missing colon ':' after if statement -> Option A

4. Quick Check:

   if statement needs ':' [OK]

Hint: Check colons after if statements [OK]

Common Mistakes:

• Ignoring syntax errors
• Assuming return types are wrong
• Confusing parameter names

5. You want to create an HTTP triggered function that accepts JSON data in a POST request and returns the value of the 'name' field. Which code snippet correctly handles this in Python?

hard

A. def get_name(request):
data = request.get_json()
return f"Hello, {data.name}!"

B. def get_name(request):
data = request.get_json()
return f"Hello, {data['name']}!"

C. def get_name(request):
data = request.get_json
return f"Hello, {data['name']}!"

D. def get_name(request):
data = request.json()
return f"Hello, {data.name}!"

Solution

1. Step 1: Use correct method to parse JSON

   request.get_json() is the correct method to parse JSON body in GCP HTTP functions.

2. Step 2: Access JSON data correctly

   JSON data is a dictionary, so access fields with data['name'], not data.name.

3. Final Answer:

   def get_name(request): data = request.get_json() return f"Hello, {data['name']}!" -> Option B

4. Quick Check:

   Use get_json() and dict access [OK]

Hint: Use get_json() and dict keys for JSON data [OK]

Common Mistakes:

• Using request.json() instead of get_json()
• Accessing JSON fields with dot notation
• Forgetting parentheses on get_json