角4：“对（未知URL）：0未知错误的Http失败响应”； [英] Angular 4: "Http failure response for (unknown URL): 0 Unknown Error"

问题描述

我正在尝试使用API​​ URL。我正在使用以下代码调用API。

I am trying to consume an API URL. I am calling the API with the below code.

import {HttpClient, HttpClientModule, HttpParams} from "@angular/common/http";

@Injectable()
export class PropertyPrefService {

    constructor(private http: HttpClient,
                private configurationService:Configuration) {}

    public searchProjects(propFilter:string):any{
        let temp:any;
        const options = propFilter ?
        {
            params: new HttpParams().set('query', propFilter)
        } : {};

        return this.http.get<any>(this.configurationService.propertySystemApiUrl, options)
                    .subscribe((results:any) => {
                        console.log(results);
                    });
    }

在Angular代码中，我没有得到任何响应，并且得到了一个错误：

In the Angular code I am not getting any response and am getting an error:

（未知网址）的HTTP失败响应：0未知错误。

Http failure response for (unknown url): 0 Unknown Error".

但是，当我在Chrome上打开开发人员工具时发出请求时，我看到从服务器收到了响应。

However, when I make a request if I open up developer tools on Chrome, I see that the response is received from the server.

URL是 https：// ... URL，而不是 http：// ...。

The URL is the "https://..." URL and not "http://...".

推荐答案

问题是Angular Universal使用Express，并且安全性验证了服务器的SSL证书；我使用了自签名SSL证书。

The problem is Angular Universal used Express, and the security validates the SSL certificate to the server; I used a self-signed SSL certificate.

解决方案是添加 NODE_TLS_REJECT_UNAUTHORIZED = 0 添加到您的环境以禁用Node.js中的SSL验证。您应该仅在开发中进行设置；在生产中这非常危险

The solution is to add NODE_TLS_REJECT_UNAUTHORIZED=0 to your environment to disable the SSL verification in Node.js. You should only set this in development; in production it is very risky.

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