HTTPClient POST 尝试解析非 JSON 响应 [英] HTTPClient POST tries to parse a non-JSON response

问题描述

我正在尝试在 Angular 中发出请求，我知道 HTTP 响应将不在 JSON 中，而是在文本中.但是，Angular 似乎期待 JSON 响应，因为错误如下:

I'm trying to make a request in Angular and I know that the HTTP response will not be in JSON but in text. However, Angular seems to be expecting a JSON response since the error is the following:

语法错误:意外的标记

在 JSON.parse 的位置 0 处() 在 XMLHttpRequest.c

SyntaxError: Unexpected token < in JSON at position 0 at JSON.parse () at XMLHttpRequest.c

以及

解析 http://localhost:9...

这是post方法:

return this.http.post(this.loginUrl, this.createLoginFormData(username, password), this.httpOptions)
  .pipe(
    tap( // Log the result or error
      data => console.log(data);
      error => console.log(error)
    )
  );

和标题.

private httpOptions = {

  headers: new HttpHeaders({
    'Accept': 'text/html, application/xhtml+xml, */*',
    'Content-Type': 'application/x-www-form-urlencoded',
    responseType: 'text'
  },

) };

我认为 responseType: 'text' 足以让 Angular 期待一个非 JSON 响应.

I thought that responseType: 'text' would be enough to make Angular expect a non JSON response.

推荐答案

您将 responseType: 'text' 放在了 httpOptions 的错误部分 - 它应该坐在headers的外面，像这样:

You've put responseType: 'text' in the wrong section of your httpOptions - It should sit outside of headers, like so:

private httpOptions = {
  headers: new HttpHeaders({
    'Accept': 'text/html, application/xhtml+xml, */*',
    'Content-Type': 'application/x-www-form-urlencoded'
  }),
  responseType: 'text'
};

根据您之前的情况，responseType 的请求标头被发送到服务器，而不是简单地向 Angular 发出指令以实际将响应视为文本.

With what you had before, a request header of responseType was being sent to the server, rather than simply having an instruction to Angular to actually treat the response as text.

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