Angular 6无法使用代理从外部服务器API获取数据

Question

我正在使用本地 Angular 应用程序，但在从外部服务器上的 API 获取数据时遇到问题。我尝试使用代理，所以我创建了文件 proxyconfig.json 并通过

将它包含在命令行中

ng serve --proxy-config proxyconfig.json

这是内容：

{
    "/api/*": {
    "target": "https://bittrex.com/api/v1.1/public/",
        "secure": false,
        "pathRewrite": {
            "^/api": ""
        },
        "changeOrigin": true
    }
}

我需要传递变量，所以我创建了服务 OrderBookService：

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { OrderBook } from './order-book.model';


@Injectable({
    providedIn: 'root',
  })
export class OrderBookService {
    constructor(private httpClient: HttpClient) {

    }
    getOrderBookBittrex(currency1: string, currency2: string): Observable<OrderBook[]> {
        const url = `http://localhost:4200/api/getorderbook?market=${currency1}-${currency2}&type=both`;
        return this.httpClient.get<OrderBook[]>(url);
    }
}

问题是当我想获取这些数据并将其保存到组件中的变量时，路径未正确转换：它正在向 http://localhost:4200/api/getorderbook?market=BTC-LTC&type=both 发送请求，而不是 https://bittrex.com/api/v1.1/public/getorderbook?market=BTC-LTC&type=both：

  private getTransfers(): void {
    const currency1 = 'BTC';
    const currency2 = 'LTC';
    this.orderBookService.getOrderBookBittrex(currency1, currency2)
      .subscribe(orders => {
        this.orderBook = orders;
      });
  }

有人知道如何正确操作吗？

当我像这样将所有路径放入 proxconfig.json 时，它工作正常：

{
    "/api/*": {
        "target": "https://bittrex.com/api/v1.1/public/getorderbook?market=BTC-LTC&type=both",
        "secure": false,
        "pathRewrite": {
            "^/api": ""
        },
        "changeOrigin": true
    }
}

但我需要传递变量。

Answer 1

你编码

getOrderBookBittrex(currency1: string, currency2: string): Observable<OrderBook[]> {
    const url = `http://localhost:4200/api/getorderbook?market=${currency1}-${currency2}&type=both`;
    return this.httpClient.get<OrderBook[]>(url);
}

只需更改网址即可

getOrderBookBittrex(currency1: string, currency2: string): Observable<OrderBook[]> {
    const url = `/api/getorderbook?market=${currency1}-${currency2}&type=both`;
    return this.httpClient.get<OrderBook[]>(url);
}

您不需要在代码中使用http://localhost:4200。

还有"pathRewrite": { "^/api": "" }, 也不需要