当API不允许Access-Control-Allow-Origin时该怎么办 [英] What to do when an API doesn't allow Access-Control-Allow-Origin

问题描述

我对所有这些同源策略的事情感到疯狂。

I'm driving crazy with all this same-origin-policy thing.

当我尝试向Google Maps API发出请求时，我没有遇到任何问题：

When I try to do a request to the Google Maps API I have no problems:

var jsonData = $.ajax({
        url:"http://maps.googleapis.com/maps/api/geocode/json?address=",
        dataType:"json",
        async:true,
        success: function(json){...}
}

我认为这是因为Google Maps API允许Access-Control-Allow-Origin。但是当我尝试使用openls.geog.uni-heidelberg.de API我得到了跨源错误：

I think that is because Google Maps API allow Access-Control-Allow-Origin. But when I try to use the openls.geog.uni-heidelberg.de API I get the cross-origin error:

var xmlData = $.ajax({
              type: "GET",
              url:"http://openls.geog.uni-heidelberg.de/route?"
              //dataType:"jsonp xml",
              dataType: "xml",
              async:true,
              crossDomain : true,
              success: function(xml){...}
}

否'Acc ess-Control-Allow-Origin'标头出现在请求的资源上。因此，不允许访问 http：// localhost 。

有人认为我不明白的是，如果openls API不允许跨源，为什么可以直接从我的浏览器直接输入请求，只需输入以下网址：

One think I dont understand is if the openls API doesn't allow cross-origin why can do a request directly from my browser just typing the url like:

http： //openls.geog.uni-heidelberg.de/route?start=9.256506,49.240011&end=8.72083,49.7606&via=&lang=de&distunit=KM&routepref=Bicycle&weighting=Shortest&avoidAreas= &安培; useTMC =假安培; noMotorways =假安培; noTollways =假安培; noUnpavedroads =假安培; noSteps =假安培; noFerries =假安培; instruc tions = false

但是我不能用jquery来做。我也尝试了jsonp解决方案，但它不能用于xml。

But I can not do it using jquery. I have also tried the jsonp solution but it's not working with xml.

对于发生了什么事情的一些想法？

Some idea of what is going on?

推荐答案

我在本地运行的两个项目（Angular App和Node.JS Webservices）的交互引起的CORS问题上花费了太长时间

i struggled for way too long with CORS issues caused by the interaction of two projects running locally (Angular App and Node.JS Webservices)

看看简单易用的解决方法：Chrome的插件AllowControlAllowOrigin。

Behold the short easy workaround : Chrome's plugin AllowControlAllowOrigin.

https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi

只需将单选按钮从红色切换为绿色，不再阻止请求，错误或警告！
我希望它能与你的API一起使用，当然它不是一个永久性的解决方案，但这是避免在那些烦人的经常性问题上浪费时间的好方法。

Just switch the radio button from red to green, and no more blocked request, error or warning ! I hope it'll work with your API, Of course it isn't a permanently solution but that's a great way to avoid loosing time on those anoying recurrent issues.

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