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我是 Angular 5 的新手，我想发送 http 请求，但它在检查元素中返回 CORS 错误。
错误
XMLHttpRequest cannot load http://example.com/account/create. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access. The response had HTTP status code 403.
下面是我的代码:
postFormData(apiUrl: string, value: Object): Observable<any> {
const body = value;
const headers = new Headers();
const utcOffset = -(new Date().getTimezoneOffset());
headers.append('Content-Type', 'application/json');
headers.append('utc-offset', utcOffset.toString());
headers.append('platform', 'WEB');
headers.append('app-version', '1.00');
headers.append('version', '1.0');
headers.append('accept', 'application/json');
headers.append('Access-Control-Allow-Origin', '*');
headers.append('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
headers.append('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
if (localStorage.getItem('user')) {
const user = JSON.parse(localStorage.getItem('user'));
headers.append('token', user.token);
headers.append('session', user.session);
}
// const options = new RequestOptions({ headers: headers });
return this.http.post(apiUrl, body, { headers: headers })
.map(this.extractData)
.catch(this.handleServerError);
}