OpenAPI Spec Connection Refused - swagger

Question

I am having problem with my OpenAPI spec file. I am trying to call an exposed url to 'GET' an id but every time i port forward the service to my local and then try to send request through API document my connection is refused. I would appreciate any help. The id that i am expecting would be in JSON format. Below is my spec file
openapi: "3.0.0"
info:
version: 1.0.0
title: Id Generator
servers:
url: www.someurl.com
paths:
/posts:
get:
summary: Get Id
operationId: id
tags:
- posts
responses:
200:
description: successful operation
content:
application/json:
schema:
$ref: "#/definition/Post"
default:
description: unexpected error
content:
application/json:
schema:
$ref: "#/definition/Error"
definition:
Post:
type: object
properties:
id:
type: string
Error:
properties:
id:
type: string

Answer 1

As of June 21 2017, OpenAPI Specification 3.0 is not out yet and Swagger UI does not support OpenAPI 3.0 yet, so your example can't possibly work. Keep an eye on Swagger UI releases page to know when support for OpenAPI 3.0 is available.
Also, you'll need to fix the errors in your spec to make it a valid OpenAPI 3.0 spec:
servers is an array, so change that to:
servers:
- url: http://www.someurl.com
Response status codes must be quoted: "200" or '200'.
Indent the $ref under schemas:
schema:
$ref: "#/definition/Post"
...
schema:
$ref: "#/definition/Error"
Change definition to components->schemas and fix the indentation for Post:
components:
schemas:
Post:
type: object
properties:
id:
type: string
Error:
properties:
id:
type: string