how to open an url and return data from there in odoo 10?

Question

I have developed simple custom odoo module. on button click action I wrote a simple method that should simply display data on the odoo screen. Module is getting installed successfully, but not performing required action so please help me. Thanks in advance.

my button code in header tags

*<header>
  <button name="get_data" type="object" string="Click" class="oe_highlight" />
</header>*

my python method inside model.py

*from odoo import models, fields, api
import requests
class gabzilAi(models.Model):
    _name = 'ai.gabzil'
    _description = 'Gabzil Odoo Module'
    fileName = fields.Text("File content")
    @api.one
    def get_data(self):
        myreq = requests.get("http://cake.gabzil.com/api/customers")
        textdata = myreq.text
        return textdata*

I am new to Odoo so not that much familiar with the things where i am making silly mistake...