I am trying to get this to work in Odoo CE 12 but without success. My code is given below. Can anyone provide any suggestion?

def button(self):
    _logger.info('Button for printing')
    url = 'http://192.168.2.121:8069/hw_proxy/print_xml_receipt'
    data = {
        "jsonrpc": "2.0",
        "params": {
            'receipt': '<receipt><h1>Company</h1><br/><div font="a"><br/>Test</div></receipt>'}
    }
    result = urllib.request.Request(url, json.dumps(data), headers={"Content-Type":"application/json"})

Help me Mario.

have a problem, my code is following suit. As follow: .

import urllib2 
import json

def prinPdf(self,cr,uid,context=None): 
        url = 'http://10.0.137.46:8069/hw_proxy/print_xml_receipt'
        data = {
                "jsonrpc": "2.0",
                "params": {"receipt": "<h1>Company</h1>"},
            }
        req = urllib2.Request(url,json.dumps(data), headers={"Content-Type":"application/json",})
        result = urllib2.urlopen(req)
        return result

I got an error of the following type:

2015-04-30 18:54:22,561 8891 ERROR None openerp.http: Exception during JSON request handling.
Traceback (most recent call last):
  File "/opt/odoo/ferca/openerp/http.py", line 530, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/opt/odoo/ferca/openerp/http.py", line 1399, in _dispatch_nodb
    func, arguments = self.nodb_routing_map.bind_to_environ(request.httprequest.environ).match()
  File "/usr/lib/python2.7/dist-packages/werkzeug/routing.py", line 1433, in match
    raise NotFound()
NotFound: 404: Not Found

My configuration file is:

[options]
; This is the password that allows database operations:
admin_passwd = admin
db_host = False
db_port = False
db_user = testdb
db_password = 123123
addons_path = /opt/odoo/test/addons
xmlrpc_port = 8069
logfile = /var/log/odoo/odoo-test.log
log_level = debug