仅在Chrome中使用超慢速预检选项 [英] Super slow preflight OPTIONS in Chrome only

问题描述

我最近一直在苦苦挣扎，只在Chrome中出现了一个超级奇怪的问题：由于我的API（NodeJS）位于不同的子域，所以我需要使用CORS从我的前端（EmberJS）访问它。 / p>

它工作得很好，但我经常（95％的时间）拥有非常慢的OPTIONS查询，将任何API调用延迟了大约3秒。

大部分时间都花在下载一个空的内容：

它变得更加怪异当我在另一个网站上尝试使用类似的架构时，遇到了完全相同的问题。

d：

• 我一直在用Firefox和Safari试试这个功能，并没有得到任何延迟。 b
• 我一直试图在本地或在生产中尝试相同的延迟。
  
• 我一直在使用隐身模式（无扩展名）尝试此操作，并且我确切地同样的问题。

我们在后端NodeJS上使用

这是完全相同的服务响应两个名称，所以我测试完全相同的请求，客户端和服务器代码（DNS名称是可互换的）

经过测试

• Chrome 61.0.3163.100（Windows） - > DELAY


• Chrome 62.0.3202.84（Android） - > DELAY


• Chrome 62.0.3202.84（iOS-Ipad） - >确定!!!


• Firefox - >确定


• 边缘 - >确定

解决方法（在我的情况下）。在我的主机中创建一个代理来响应相同的原始DNS并避免CORS

I've been struggling recently with a super-weird problem only happening in Chrome: as my API (NodeJS) is on a different subdomain, I need to use CORS to reach it from my front-end (EmberJS).

It's working pretty well but I'm very frequently (95% of the time) having very very slow OPTIONS queries, delaying any API calls by about 3 seconds.

Most of this time is spent downloading an empty content:

It gets even weirder when I'm trying this on another website we made using a similar architecture, experiencing the exact same problem.

A few other things I tried:

• I've been trying this with Firefox and Safari, and didn't get any delay.
• I've been trying this locally or in production, experimenting the same delay.
• I've been trying this with incognito mode (no extensions), and I have the exact same problem.

We're using on the back-end NodeJS with the CORS package.

Now, I have no idea if the problem is on either Chrome 60, NodeJS, the CORS package or EmberJS + jQuery.

Anyone experienced this too?

解决方案

Just as a note: It seems a chrome bug

I reproduced the issue using a server with two DNS names using a service in a unique domain

https://domain1.com  --> https://domain1.com (No CORS, no delay)
https://domain2.com  --> https://domain1.com (CORS, delay)

It is exactly the same service responding to two names, so I am testing exactly the same request, client and server code (DNS names are interchangeable)

Tested with

• Chrome 61.0.3163.100 (Windows) -->DELAY
• Chrome 62.0.3202.84 (Android) -->DELAY
• Chrome 62.0.3202.84 (iOS-Ipad) -->OK!!!
• Firefox-->OK
• Edge --> OK

Workaround (in my case). Create a proxy in my host to respond to the same origin DNS and avoid CORS

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