Rest API calls

import { Injectable } from '@angular/core';
import { Http } from "@angular/http";
import { Student } from "./student";
import { Observable } from "rxjs";
import "rxjs/add/operator/map";
@Injectable()
export class StudentService {
    constructor(private http:Http) { }
    insertStudent(student:Student){
        return this.http.post("http://localhost:3000/students",student).
                map((response) => response.json());
    }
    getStudents()
    {
        return this.http.get("http://localhost:3000/students").
                map((response) => response.json());
    }
    getStudentById(id:number)
    {
      return this.http.get("http://localhost:3000/students/"+id).
                map((response) => response.json());
    }
    deleteStudent(student:Student){
      return this.http.delete("http://localhost:3000/students/"+student.id).
                map((response) => response.json());
    }
    updateStudent(student:Student){
      return this.http.put("http://localhost:3000/students/"+student.id,student).
                map((response) => response.json());
    }
}