I write an API to create user in odoo database

if I enter username and password for existing user at first time I receive the message that i add in this case in second time i receive conflict message and status code and the server stop receive any thing what ever I request I receive conflict and the problem need restart the server 

any solution ??

my code:

 @http.route('/register',  auth="public",csrf=False, website=True, methods=['POST'],type="json")

    defregister(self,idd= None, **kw):

        un='perla'

        password1 = 'perla'

        db = 'perla'

        body = request.jsonrequest

        username = body['body']['username']

        password = body['body']['password']

        common = xmlrpclib.ServerProxy('{}/xmlrpc/2/common'.format(self.url))

        print(common)

        g = True

        try:

            print('uid')
            uid = common.authenticate(db,un, password1, {})

            print(uid)

            print('uid')

        except:

            response = json.dumps({ 'jsonrpc': '2.0', 'message': 'Unauthorized!'})

            return Response(            response, status=401,            headers=[('Content-Type', 'application/json'), ('Content-Length', 100)]                )

           
        if(g== False):

            print("false")

            print(Response)

                     print('false 222 ')

            # return Response

            response = json.dumps({ 'jsonrpc': '2.0', 'message': 'Unauthordecfedceized!'})

            returnResponse(            response, status=401,            headers=[('Content-Type', 'application/json'), ('Content-Length', 100)]

                )

                    else:

            print("else")
            models = xmlrpclib.ServerProxy('{}/xmlrpc/2/object'.format(self.url))

            print("EMP")

        try:

            print('try')

            is_there= models.execute_kw(self.db, uid, self.password, 'res.users', 'search_count', [[['login', '=', username]]])

            ifis_there :

                response=json.dumps({ 'jsonrpc': '2.0', 'message': 'This User is already exist'})

                Response.status = '409'

                returnresponse

            else :

                user_id = models.execute_kw(self.db, uid, password1, 'res.users', 'create', [{'name': username, 'password' : password, 'login' :username ,'sel_groups_1_9_10':9, 'sel_groups_25_26_27' : 26,'is_active' :False}])

            print('user_id' + str(user_id))

        exceptExceptionase :

                        response=json.dumps({ 'jsonrpc': '2.0', 'message': 'This User is already exist'})            Response.status = '409'

            return Response( response, status=409,            headers=[('Content-Type', 'application/json'), ('Content-Length', 100)]                )

        ifuser_id :

            date_now = str(datetime.today())

            print('date_now  >>>'  +str(date_now))

            payload = {                'id': user_id,

                'username': username, 

               'password': password,

                'login' :username ,

                'is_active':False,

                'timestamp' : date_now,}

            # user_details = '{"id" :"%s" , "username" : "%s" , "timestamp":"%s"}'  %(user_id ,username,date_now)

            SECRET='ali.ammar'

            enc = jwt.encode(payload, SECRET)

              new_user_id_count =models.execute_kw(self.db, uid, password1, 'user.token', 'search_count', [[['name' , '=', user_id]]])

              create_user_verification = models.execute_kw(self.db, uid, password1, 'user.verification', 'create', [{'name': user_id,'is_valid' : True}])

            print("create_user_verification" + str(create_user_verification))

            ifnew_user_id_count:

                models.execute_kw(self.db, uid, password1, 'user.token', 'write', [['name' , '=' , user_id], {'token': enc}])

            else :

                models.execute_kw(self.db, uid, password1, 'user.token', 'create', [{'name': user_id, 'token': enc }])

            uid=0

            return json.dumps({"details":payload})

                    else:

            return json.dumps({'Error': "Invalid credentials"})