CORS sync sends OPTIONS request instead of POST

Question

I'm trying to use the POST API Call in Angular Component . I got the following request headers which are far from my expectations:

 

Here is a code:

 

postAccount(occount:OAccount){

var body=JSON.stringify(oaccount);

var headerOptions=new Headers({'Content-Type':'application/json'});

var requestOptions=new RequestOptions({method:RequestMethod.Post,headers:headerOptions,withCredentials:true})

return this.http.post(this.API_ENDPOINT + 'OAccount',body,requestOptions).map(x=>x.json());

}

 

Request URL:http://localhost:5000/api/Account

Request method:OPTIONS

Remote address:07.0.0.0:0000

Status code:

401

Version:HTTP/1.1

Referrer Policy:no-referrer-when-downgrade

Response headers (390 B)

Raw headers

Cache-Control

private

Content-Length

6143

Content-Type

text/html; charset=utf-8

Date

Wed, 31 Jul 2019 17:04:16 GMT

Server

Microsoft-IIS/10.0

WWW-Authenticate

Negotiate

WWW-Authenticate

NTLM

X-Powered-By

ASP.NET

X-SourceFiles

=?UTF-8?B?QzpcVXNlcnNcMzUxNzU2…2lvblxhcGlcT3NhQWNjb3VudA==?=

Request headers (417 B)

Raw headers

Accept

*/*

Accept-Encoding

gzip, deflate

Accept-Language

en-US,en;q=0.5

Access-Control-Request-Headers

content-type

Access-Control-Request-Method

POST

Connection

keep-alive

Host

localhost:5000

Origin

http://localhost:4000

Referer

http://localhost:4000/accounts

User-Agent

Mozilla/5.0 (Windows NT 10.0; …) Gecko/20100101 Firefox/68.0