Pass value to server add extra character in iPhone 6s, 6s Plus

Hello
I have sent value to server. In iPhone 6s, 6s plus pass extra additional character. In my parameter add “d” character in iPhone 6s, 6s plus. i have pass value from input field to server. I have passed value like

$http({
method: ‘POST’,
url: ‘url’,
params: {userId:reg.userid, email:reg.email
},
headers : { ‘Content-Type’: ‘application/json’ }
}).success(function(data, status, headers, config) {
// success
}).error(function(data, status, headers, config) {
})

Note: other iPhone it is working without iPhone 6s, 6s Plus . I am facing peculiar problem.

Please suggest me…
advance thanks

var myParams = {‘userId’:reg.userid,‘email’:reg.email};

$http({
method: ‘POST’,
url: ‘url’,
params: myParams
},
headers : { ‘Content-Type’: ‘application/json’ }
}).success(function(data, status, headers, config) {
// success
}).error(function(data, status, headers, config) {
})