为什么angular 4中的httpclient假设请求正在发送json数据 [英] Why httpclient in angular 4 is assuming that request am sending json data

问题描述

我正在使用角度为4的HTTP客户端到返回文本数据的服务器，因此我做了如下操作

I am using angular 4 http client to a server which returns text data so for that I did something like below

this.http.get('assets/a.txt').map((res:Response) => 
res.text()).subscribe((data: any) => {
  console.log(data.text());
});

我没有告诉它响应是json格式的任何地方，但仍然引发以下错误

I did not tell it any where that the response is in json format but still it is raising the below error

SyntaxError:Object.parse位置0处的JSON中意外的令牌a ()在XMLHttpRequest.onLoad

SyntaxError: Unexpected token a in JSON at position 0 at Object.parse () at XMLHttpRequest.onLoad

这些人假设响应是json格式:)

On what basis these people assume as the response is in json format :)

推荐答案

默认情况下，新HttpClient的响应为JSON.如果要获取其他格式的响应，可以通过requestOption responseType: 'text'进行设置.以下是有关此实现的更多信息: https://angular.io/guide/http#requesting-non-json-data

The Response of new HttpClient is JSON by default. If you want to get the response in another format, you can set it via requestOption responseType: 'text'. Here is some more information about this implementation: https://angular.io/guide/http#requesting-non-json-data

一个例子:

this.http.get('assets/a.txt', { responseType: 'text' }).map((res:Response) => 
res).subscribe((data: any) => {
  console.log(data);
});

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