Angular 2 Token:预检的响应具有无效的HTTP状态代码400

Question

我有一个运行Visual Studio Code的Angular2/TypeScript应用程序.

在VS 2015中运行的API.这是API项目:http://www.asp.net/web-api/overview/security/individual-accounts-in-web-api

我可以使用API​​并创建新用户,但是当我尝试登录(使用令牌功能)时,我收到以下错误: XMLHttpRequest无法加载https:// localhost:44305/Token.预检的响应具有无效的HTTP状态代码400

标题看起来像这样:

Request URL:https://localhost:44305/Token
Request Method:OPTIONS
Status Code:400 
Remote Address:[::1]:44305
Response Headers
cache-control:no-cache
content-length:34
content-type:application/json;charset=UTF-8
date:Wed, 10 Aug 2016 19:12:57 GMT
expires:-1
pragma:no-cache
server:Microsoft-IIS/10.0
status:400
x-powered-by:ASP.NET
x-sourcefiles:=?UTF-8?B?QzpcQ2hlY2tvdXRcQVBJXzJ2czJcQVBJXEFQSVxUb2tlbg==?=
Request Headers
:authority:localhost:44305
:method:OPTIONS
:path:/Token
:scheme:https
accept:*/*
accept-encoding:gzip, deflate, sdch, br
accept-language:en-US,en;q=0.8,da;q=0.6,nb;q=0.4
access-control-request-headers:authorization
access-control-request-method:POST
cache-control:no-cache
origin:http://evil.com/
pragma:no-cache
referer:http://localhost:3000/signin
user-agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36

我的角度服务看起来像这样:

 loginAccount(account: Account): Observable<string> {        
    var obj = { Email: account.Email, Password: account.Password, grant_type: 'password' };
        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions( {method: RequestMethod.Post, headers: headers });

        let body = JSON.stringify(obj);
        console.log('loginAccount with:' + body);

         return this._http.post('https://localhost:44305/Token',  body, options)
                             .map(this.extractData)
                             .catch(this.handleError);
}

当我在API项目中使用AJAX函数时:http://www.asp.net/web-api/overview/security/individual-accounts-in-web-api然后它工作得很好?? 我在Angular POST请求中做错了什么？

Answer 1

我找到了解决方案.感谢API网站上的评论:http://www.asp.net/web-api/overview/security/individual-accounts-in-web-api

我必须为application/x-www-form-urlencoded设置正确的标头; charset = UTF-8并序列化我发布的对象.我找不到Angular序列化器方法,所以我在JavaScript中创建了自己的(从另一个stackoverflow站点复制).

以下是用户登录API并在使用Angular2和TypeScript时请求令牌的最终调用:

 loginAccount(account: Account): Observable<string> {        
    var obj = { UserName: account.Email, Password: account.Password, grant_type: 'password' };

        let headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' });
        let options = new RequestOptions( {method: RequestMethod.Post, headers: headers });

        let body = this.serializeObj(obj);

         return this._http.post('https://localhost:44305/Token',  body, options)
                             .map(this.extractData)
                             .catch(this.handleError);
}

private serializeObj(obj) {
    var result = [];
    for (var property in obj)
        result.push(encodeURIComponent(property) + "=" + encodeURIComponent(obj[property]));

    return result.join("&");
}