How do I send a Google API POST request using Jmeter?

Question

I have never used Jmeter before. I have been trying to use Jmeter to send an HTTP request to Google Vision API - but it's returning a FORBIDDEN (403) error. My request as well as required response is in JSON format.
I have attached below the:
a) HTTP Request
b) Response Error

Other than this, in HTTP Header Manager I have set:
Content-Type: application/json

What is wrong with the attached request?
Request image..
Response error image

Answer 1

According to Authenticating to the Cloud Vision API article you might require to provide OAuth token, it can be done via HTTP Header Manager like:

• Name: Authorization
• Value: Bearer YOUR_ACCESS_TOKEN

See How to Run Performance Tests on OAuth Secured Apps with JMeter article for more details on interacting with OAuth-protected web applications in JMeter tests.