OpenAPI some unkown values - swagger

Question

I'm reading this: OpenAPI 3.0 Tutorial
If I'm looking on one of the examples, there are some things I can't understand
openapi: 3.0.0
info:
version: 1.0.0
title: Simple API
description: A simple API to illustrate OpenAPI concepts
servers:
- url: https://example.io/v1
components:
securitySchemes:
BasicAuth:
type: http
scheme: basic
security:
- BasicAuth: []
paths:
/artists:
get:
description: Returns a list of artists
parameters:
- name: limit
in: query
description: Limits the number of items on a page
schema:
type: integer
- name: offset
in: query
description: Specifies the page number of the artists to be displayed
schema:
type: integer
responses:
'200':
description: Successfully returned a list of artists
content:
application/json:
schema:
type: array
items:
type: object
required:
- username
properties:
artist_name:
type: string
artist_genre:
type: string
albums_recorded:
type: integer
username:
type: string
'400':
description: Invalid request
content:
application/json:
schema:
type: object
properties:
message:
type: string
# ----- Added lines ----------------------------------------
post:
description: Lets a user post a new artist
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- username
properties:
artist_name:
type: string
artist_genre:
type: string
albums_recorded:
type: integer
username:
type: string
responses:
'200':
description: Successfully created a new artist
'400':
description: Invalid request
content:
application/json:
schema:
type: object
properties:
message:
type: string
# ---- /Added lines ----------------------------------------
Why the response of /get contains: required: username ? what is the meaning of this ?
if I don't want basic authentication, can I remove this line ?
Why do we need to write required: true for the requestBody under the post ? It's not basic that post contains body ?

Answer 1

The answer of your questions are:
Why the response of /get contains: required: username? what is the meaning of this? if I don't want basic authentication, can I remove this line?
Ans: Username is required means it's mandatory, i.e. response must contain this field with some value in it. It's not associated with basic authentication. So, yes you can remove that line if it is not used by the application.
Why do we need to write required: true for the requestBody under the post? It's not basic that post contains body?
Ans: Required: true is not mandatory to write here. It's an optional field and post must have a request body. Yeah, you are right. It's a basic thing that posts must have to contain the request body.
If you can have any confusion further then let me know. Thanks