HTTP request methods for IoT (GET, POST, PUT) in IOT Protocols - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding HTTP GET method in IoT

Which statement best describes the purpose of the HTTP GET method when used in IoT devices?

A It deletes a resource from the server.

B It requests data from a server without changing any resource on the server.

C It updates an existing resource on the server with new data.

D It sends new data to the server to create a resource.

💡 Hint

Think about when you want to read sensor data without changing anything.

The GET method is used to retrieve data from a server. It does not modify any data or resource on the server, making it safe and idempotent.

💻 Command Output

intermediate

Output of HTTP POST request in IoT

What is the typical server response status code after a successful HTTP POST request from an IoT device sending new sensor data?

A 201 Created

B 404 Not Found

C 204 No Content

D 200 OK

💡 Hint

Consider what status code means a new resource was successfully created.

HTTP 201 Created indicates that the server has successfully created a new resource as a result of the POST request.

❓ Configuration

advanced

Configuring HTTP PUT for IoT device firmware update

You want to update the firmware on an IoT device using HTTP PUT. Which of the following best describes the correct use of PUT in this context?

A PUT requests the current firmware version without changing it.

B PUT sends partial data to update only some fields of the firmware metadata.

C PUT deletes the existing firmware before uploading new firmware.

D PUT replaces the entire firmware resource on the device with the new firmware data.

💡 Hint

Think about how PUT differs from PATCH in updating resources.

PUT replaces the entire resource at the target URL. For firmware updates, this means the whole firmware is replaced with the new version.

❓ Troubleshoot

advanced

Troubleshooting HTTP POST failure in IoT sensor data upload

An IoT device tries to send sensor data using HTTP POST but receives a 405 Method Not Allowed error. What is the most likely cause?

A The server does not support POST method at the requested URL.

B The device sent data using GET instead of POST.

C The server is down and cannot process any requests.

D The device's network connection is lost.

💡 Hint

405 means the method is not allowed on the server for that URL.

A 405 error means the server understands the request method but refuses to allow it for the target resource, often because POST is not enabled there.

🔀 Workflow

expert

Choosing HTTP methods for IoT device data lifecycle

Arrange the HTTP methods in the correct order to represent a typical IoT device data lifecycle: retrieving current data, sending new data, and updating existing data.

A 1,3,2

B 2,1,3

C 1,2,3

D 3,2,1

💡 Hint

Think about the natural flow: first read, then create, then update.

The typical flow is GET to retrieve data, POST to send new data, and PUT to update existing data.