How to make something like remote method on loop-back middleware?

Question

In fallowing code i want to make something like remote method on middleware in loopback to post values to calculate for example: in app :

submitForm() {
    let headers = new Headers(
      {
        'Content-Type': 'application/json',
        'Accept': 'application/json'
      });
    let options = new RequestOptions({ headers: headers });

    let data = JSON.stringify({
      Value1: this.form.value1,
      Value2: this.form.value2,
      Value3: this.form.value3
    });   
    console.log(data);

    let url = 'http://localhost:3000/calculate';
console.log(url);
    return new Promise((resolve, reject) => {
      this.http.post(url, data, options)
        .toPromise()
        .then((response) => {
          console.log('API Response : ', response.status);
          resolve(response.json());
        })
        .catch((error) => {
          console.error('API Error : ', error.status);
          console.error('API Error : ', JSON.stringify(error));
          reject(error.json());
        });
    });
  }

and in remote method or anything like that, I used such this code but totally fails:

module.exports = function () {
    accepts: [{arg: 'val1', type: 'number'},{arg: 'val2', type: 'number'}],
  returns: {arg: val1+val2, type: 'number'},
  http: {path: '/calculate', verb: 'get'}
});
};

Answer 1

Example remote method that I used correctly

module.exports = function (TeamRole) {
      TeamRole.getUsers = function (id, cb) {
        TeamRole.find({
          where: {
            teamId: id
          }
        }, function (err, users) {
          cb(null, users);
        });
      };

      TeamRole.remoteMethod('getUsers', {
        accepts: {
          arg: "id",
          type: "string",
          required: true
        },
        returns: {
          arg: 'users',
          type: 'Array'
        },
        http: {
          path: '/:id/users',
          verb: 'get'
        }
      });
}

As above example you can define remote method correctly to achieve you task.

cheers.