使用标头呈现JSON [英] Render JSON with header

问题描述

我想在控制器中使用以下 cors 标头呈现JSON：

I want to render JSON with the following cors header in my controller:

'Access-Control-Allow-Origin' = '*'.

我试过这个：

def my_action
  render(json: some_params)
  response.headers['Access-Control-Allow-Origin'] = '*'
end

但我有一个 AbstractController :: DoubleRenderError 。有没有方法用头来渲染JSON？

but I got an AbstractController::DoubleRenderError. Are there ways to render JSON with headers?

推荐答案

渲染后不能设置标题，因为响应是发送的。

You can't set a header after render, because the response is sent. So change the headers after makes no sense and you get this error.

尝试：

def my_action
  response.headers['Access-Control-Allow-Origin'] = '*'
  render(json: some_params)
end

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