Create REST API in ServiceNow

REST : Representational State Transformation

Representational - Same data/resource we can represent in different ways
State - state of the data
Transfer - exchanging data

API - Application Programming Interface (Interface that allow us to connect two different application)

We create interface to connect to the database to send/receive data over the internet through HTTP protocol.

Rest is all about managing resources(CRUD).

PATH parameters:

QUERY parameters

offset = starting point
limit = how many records you want

Status code help us to understand what has happened with our request.

100 - Informational Status
200 - Success Status
300 - Redirectional status
400 - Client Side Error
500 - Server Side Error

200 = Resource has been updated/created and it can return all information.
201 = Resource has been updated/created however it will return few details.
400 = Fault with client side.(Invalid request payload or headers)
409 = Entity you are creating already exists in the system.
404 = Not found error

To handle REST Error

var sn_ws_err=new sn_ws_err.ServiceError(); // Custom errors

// setStatus(code);
// setDetails(str/obj/num);
// setMessage(message);

// new sn_ws_err.ConflictError('error message'); // 409
// new sn_ws_err.NotFoundError('error message'); // 404

What are HTTP headers?
Answer: Headers are part of request which is used to exchange metadata with respect to the request, which doesn't have anything to do with actual resources.

[DonDomel]

absolutely awesome I was searching for this !