为什么这个jQuery。ajax不会引发错误吗?

We had an interesting issue this morning - the details of the issue itself aren't relevant here, and I already fixed it, but I did run into something strange, to me, about jQuery.

今天早上我们遇到了一个有趣的问题——问题本身的细节在这里并不相关，我已经修复了它，但是我确实遇到了一些奇怪的东西，关于jQuery。

The site I am building internally runs on https, only, so Apache is set to redirect any inbound http request to its https equivalent. This redirect is working fine. But, I had a bug in my software where I was trying to send the following ajax request:

我正在构建的站点只在https上运行，因此Apache被设置为将任何入站http请求重定向到它的https对等服务器。这个重定向运行良好。但是，我的软件有一个bug，我想发送以下ajax请求:

jQuery.ajax({  type:       "PUT",
           url:        "http://somewhere.com/cmdt/todo_lists/8457/toggle",
           data:       { deployment_id: 827},
           dataType:   "script"});

I understand that this would fail - I'm alright with jQuery not wanting to follow a redirect. But the actual behaviour is even weirder: I never see an xhr request go out at all! And there's no javascript error! It just fails, silently. If I change the url to https, or to a relative path, it works fine, no problem. My question is, why wasn't it TRYING to send out the request before? And why didn't it raise an error?

我理解这将会失败——对于jQuery不希望遵循重定向，我没有意见。但实际的行为更奇怪:我从来没有见过xhr发出任何请求!并且没有javascript错误!它只是失败,默默地。如果我将url更改为https或相对路径，它可以正常工作，没有问题。我的问题是，为什么它之前不尝试发出请求呢?为什么它没有引起误差呢?

2 个解决方案

#1

The reason you're not getting a failure is because it's a cross-site request, and so instead of using XMLHttpRequest, it's actually generating an HTML <script> tag and dropping it into the DOM, and using that mechanism to load the file.

您没有收到失败的原因是它是一个跨站点请求，因此它不是使用XMLHttpRequest，而是生成一个HTML

This works reasonably well (considering it's a complete hack around wrong-headed browser "security" notions) but there's no way for jQuery to trap errors at that point, sadly. You will likely get a browser error if you have developer mode turned on, but that's it.

这非常有效(考虑到这是对错误的浏览器“安全性”概念的彻底破解)，但遗憾的是，jQuery在这一点上没有办法捕捉错误。如果打开了developer mode，可能会出现浏览器错误，但仅此而已。

2 个解决方案

#1

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