Sample GET request spec with custom headers

products_spec.rb

require 'rails_helper'

RSpec.describe Api::V1::ProductsController, type: :request do
  describe 'GET#index' do
    it 'list all products' do
      # you can add more headers in that hash
      headers = {
        'ACCEPT' => 'application/json',
        'CONTENT_TYPE' => 'application/json',
      }
      
      # Setup specs, create data
      get '/api/v1/products', params: nil, headers: headers, as: :json
    end
  end
end