仅针对一个用户的随机 CORS 预检问题 [英] random CORS preflight problem only for one user

问题描述

我有一个使用 angular 8 开发的应用程序.它使用 httpClient 与后端通信并使用身份验证.

I have an application developed with angular 8. It uses httpClient to comunicate with the backend and uses autentication.

我有一个奇怪的问题，经过长时间的研究，我可以找到解决方案.

I have a weird problem I can find the solution after long research.

我的用户遍布世界各地，但只有其中一个失败.

I have users all over the world, and it only fails for one of them.

对于一个特定用户和(显然)随机，API 被拒绝，至少正如控制台中所说的那样，因为预检 CORS 问题:

For one particular user and (apparently) randomly, the APIs are rejected, and at least as it's said in the console, because of a preflight CORS issue:

Access to XMLHttpRequest 'myAPIip.com" from origin 'myip.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource

在控制台中，出现错误:

In the console, there is the error:

Error: Uncaught (in promise): EmptyError: no elements in sequence↵

以及所有这些堆栈跟踪.

and all this stack trace.

没有防火墙.

有人遇到过类似的情况吗?会发生什么?

Does anybody face similar situation? what can be happening?

推荐答案

FWIW，我们也面临着类似的问题.我们最终将其缩小到包含 unicode 字符的用户信息.例如，收到错误的用户的姓氏类似于:

FWIW, we were also facing a similar problem. We eventually narrowed it down to the user info containing a unicode character. For example, the user getting the error had a last name similar to:

• 弗朗索瓦
• 索里娜
• 努涅斯

我们使用的 HTTP 代理无法处理此类 unicode 字符.希望这对未来的人有所帮助.

The HTTP proxy that we were using couldn't handle such unicode characters. Hope this helps someone in the future.

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