CORS issue asp.net core web api. No 'Access-Control-Allow-Origin' header is present [closed] - asp.net-core

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I am using asp net core 2.1 and I have an account controller with following methods:
[HttpPost("login")]
public async Task<object> Login([FromBody] IdentityUserForLoginDto userForLogin)
{...}
[HttpPost("register")]
public async Task<object> Register([FromBody] IdentityClientForRegistrationDto userForRegistration)
{...}
When I fetch data on login method, everything works fine and user normally logs in, but when I try to register new user I get CORS issue:
Access to fetch at 'http://localhost:53531/api/account/register' from origin 'http://localhost:3001' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
and:
POST http://localhost:53531/api/account/register net::ERR_FAILED
In my backend I tried every possible combination of enabling CORS and for now I have this:
ConfigureServices:
services.AddCors(options => options.AddPolicy("ApiCorsPolicy", builder =>
{
builder
.WithOrigins("http://localhost:3000", "http://localhost:3001")
.AllowAnyHeader().AllowCredentials()
.AllowAnyMethod();
}));
Configure
app.UseCors("ApiCorsPolicy");
Client-side data fetching:
fetch(`http://localhost:53531/api/account/register`, {
method: 'POST',
headers: { 'Content-Type': 'application/json'},
body: JSON.stringify(values)
})
.then(handleResponse)
.then(user => {
localStorage.setItem('currentUser', JSON.stringify(user));
currentUserSubject.next(user);
return user;
});
Both of them are placed before Add/UseMvc.
I've tried with AllowAnyOrigin, [EnableCors] etc..but always the same.
I want to point out that I've also tried with disabling cors from client but in that case I get text/plain media type and I explicitly want application/json.
Also, when I make the same request in postman everything works great..
Does anyone have any idea how to fix that issue?

Answer 1

I solved this. Problem was in data that was sent to server..it wasn't in format that server expected it to be