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CORS没有'Access-Control-Allow-Origin'标头存在，但OPTIONS和POST请求却得到200，但

[英]CORS Getting No 'Access-Control-Allow-Origin' header is present but OPTIONS and POST request get 200 but

原文 2017-05-28 01:28:45 1 1 javascript/ php/ api

I cannot get a CORS request to work and this is day 4 battling with it. 我无法收到CORS的要求来工作，今天是第4天。 I am getting a 200 on my OPTIONS request and also a 200 on my POST request and all of the headers look like it should work, but I am still getting the error No 'Access-Control-Allow-Origin' header is present . 我在OPTIONS请求上收到200，在POST请求上收到200，所有标头看起来都应该正常工作，但是仍然出现错误No 'Access-Control-Allow-Origin' header is present 。

I am using Laravel (PHP) and the Fetch API in a React app. 我在React应用程序中使用Laravel（PHP）和Fetch API。

Here is a screenshot of my OPTIONS request and the following POST request: 这是我的OPTIONS请求和以下POST请求的屏幕截图：

OPTIONS request 选项要求

POST request POST请求

1 个解决方案

What it ended up being was I had dd(variable) which is a dump and die, in my controller. 最终结果是我的控制器中有dd(variable) ，这是一个转储而死。 For some reason, this was causing the CORS error, which can be explained better here: look for this comment: davidnknight commented on Sep 26, 2014 由于某种原因，这导致了CORS错误，可以在此处进行更好的解释：查找此评论：davidnknight于2014年9月26日发表评论

To paraphrase: If your backend is throwing errors or not completing successfully, you will get CORS errors because the correct headers are not being sent. 解释一下：如果后端抛出错误或未成功完成，则将收到CORS错误，因为未发送正确的标头。

So, make sure your backend is working properly. 因此，请确保您的后端工作正常。