Hope this will helps you:

# -*- coding: utf-8 -*-
from openerp import http
from openerp.http import Controller, route, request
import json
import ast
import yaml
import time
from datetime import datetime



class ObeAttendanceApi(http.Controller):
    @http.route('/api/attendance/', auth='public', methods=['POST'], type='http')
    def index(self, **kw):
        data = request.httprequest.data
        data_in_json = yaml.load(data)	
		# use "data_in_json" according to your requirement

Reference: http://learnopenerp.blogspot.com