如何调试“http失败响应(未知url):0未知错误”[重复]

我的API操作:

[HttpGet]
public ActionResult<IEnumerable<Loan>> Get()
{
    return _context.Loans;
}

洛坎

public class Loan
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string BorrowerName { get; set; }
    public decimal RepaymentAmount { get; set; }
    public decimal FundingAmount { get; set; }
}

洛恩斯

export class Loan {
    constructor(
        public Id : number,
        public BorrowerName : string,
        public RepaymentAmount : number,
        public FundingAmount : number
    ) { }
}

贷款.component.ts

我可以看到 http get确实正在调用我的api,它正在返回预期的数据。

import { Component, OnInit } from '@angular/core';
import {HttpClient, HttpHeaders} from '@angular/common/http';
import { Loan } from '../loan';
import { Observable } from 'rxjs';

@Component({
  selector: 'app-loans',
  templateUrl: './loans.component.html',
  styleUrls: ['./loans.component.css']
})
export class LoansComponent implements OnInit {

  loans: Loan[];

  constructor(private http:HttpClient) {

    this.getLoans().subscribe((loans) => {
      this.loans = loans;
      console.log(loans);
    })
  }

  getLoans() {
    return <Observable<Loan[]>> this.http.get('http://localhost:1113/api/loans');
  }

  ngOnInit() {
  }
}

我在控制台中看到这个错误:

我怎么才能搞清楚这件事呢?