the error is specifically at this point when making the post call

def tokenRequestBody = [

code         : code,

client_id    : grailsApplication.config.google.client.id,

client_secret: grailsApplication.config.google.client.secret,

redirect_uri : grailsApplication.config.google.client.redirecturi,

grant_type   : "authorization_code"

]

def requestEntity = new HttpEntity<>(tokenRequestBody, new HttpHeaders().setContentType(MediaType._APPLICATION_FORM_URLENCODED_))

def response = restTemplate.postForEntity(grailsApplication.config.google.auth.tokenurl, requestEntity, String)