Webhook registration endpoint in Rest API - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this webhook registration response?

Consider a webhook registration endpoint that returns a JSON response confirming the registration. What will be the output of the following code snippet when the webhook is successfully registered?

Rest API

response = {
  "status": "success",
  "message": "Webhook registered successfully",
  "webhook_id": 12345
}
print(response)

A {"status": "success", "message": "Webhook registered successfully", "webhook_id": 12345}

B {'status': 'success', 'message': 'Webhook registered successfully', 'webhook_id': 12345}

C Webhook registered successfully with ID 12345

D Error: webhook_id missing

💡 Hint

Look at how Python prints dictionaries.

The code prints the Python dictionary as is, which uses single quotes for keys and string values.

🧠 Conceptual

intermediate

Which HTTP method is typically used to register a webhook?

When creating a webhook registration endpoint, which HTTP method should be used to send the registration request?

A POST

B GET

C DELETE

D PUT

💡 Hint

Think about sending data to create a new resource.

POST is used to create new resources or submit data to the server, which fits webhook registration.

🔧 Debug

advanced

What error does this webhook registration code raise?

This Python Flask code snippet is intended to register a webhook but raises an error. What error does it raise?

Rest API

from flask import Flask, request, jsonify
app = Flask(__name__)

@app.route('/register_webhook', methods=['POST'])
def register_webhook():
    data = request.json
    url = data['url']
    if not url.startswith('http'):
        return jsonify({'error': 'Invalid URL'}), 400
    # Save webhook logic here
    return jsonify({'status': 'success', 'webhook_url': url})

# Missing app.run() call

A TypeError: 'str' object is not callable

B RuntimeError: Working outside of request context

C AttributeError: 'NoneType' object has no attribute 'startswith'

D No error, runs successfully

💡 Hint

Check what happens if request.json is None.

If the request body is empty or not JSON, request.json is None, so data['url'] raises TypeError because None is not subscriptable. But here the error is AttributeError because url is None and calling startswith on None fails.

📝 Syntax

advanced

Which option contains the correct JSON schema snippet for webhook registration?

You want to define a JSON schema for validating webhook registration data. Which option is syntactically correct?

A

{
  "type": "object",
  "properties": {
    "url": {"type": "string", "format": "uri"},
    "events": {"type": "array", "items": {"type": "string"}}
  },
  "required": [url, events]
}

B

{
  type: "object",
  properties: {
    url: {type: "string", format: "uri"},
    events: {type: "array", items: {type: "string"}}
  },
  required: ["url", "events"]
}

C

{
  "type": "object",
  "properties": {
    "url": {"type": "string", "format": "uri"},
    "events": {"type": "array", "items": {"type": "string"}}
  },
  required: ["url", "events"]
}

D

{
  "type": "object",
  "properties": {
    "url": {"type": "string", "format": "uri"},
    "events": {"type": "array", "items": {"type": "string"}}
  },
  "required": ["url", "events"]
}

💡 Hint

JSON keys and string values must be in double quotes.

Option D uses correct JSON syntax with double quotes around keys and string values, including the required array.

🚀 Application

expert

What is the number of unique events registered after these webhook registrations?

Assume a webhook registration system where each registration includes a list of events. Given these three registrations, how many unique events are registered in total? Registration 1: events = ["create", "update"] Registration 2: events = ["delete", "update"] Registration 3: events = ["create", "archive"]

A 4

B 5

C 3

D 6

💡 Hint

Count each event only once across all registrations.

The unique events are create, update, delete, archive. That's 4 unique events, but careful: create, update, delete, archive = 4, so answer is 4.