假设我有一个 Tornado Web 服务器 (localhost) 和一个网页 (othermachine.com),后者包含需要对 Tornado 服务器进行跨域 ajax 调用的 javascript。
所以我这样设置我的龙卷风:
class BaseHandler(tornado.web.RequestHandler):
def set_default_headers(self):
self.set_header("Access-Control-Allow-Origin", "http://www.othermachine.com")
self.set_header("Access-Control-Allow-Credentials", "true")
self.set_header("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE,OPTIONS")
self.set_header("Access-Control-Allow-Headers",
"Content-Type, Depth, User-Agent, X-File-Size, X-Requested-With, X-Requested-By, If-Modified-Since, X-File-Name, Cache-Control")
我的 javascript 进行了 jQuery 调用:
$.ajax({
type: 'GET',
url: "http://localhost:8899/load/space",
data: { src: "dH8b" },
success: function(resp){
console.log("ajax response: "+resp);
},
dataType: 'json',
beforeSend: function ( xhr ) {
xhr.setRequestHeader('Content-Type', 'text/plain');
xhr.setRequestHeader('Access-Control-Request-Method', 'GET');
xhr.setRequestHeader('Access-Control-Request-Headers', 'X-Requested-With');
xhr.withCredentials = true;
}
});
但我得到了可爱的XMLHttpRequest cannot load http://localhost:8899/load/space?src=dH8b. Origin http://www.othermachine.com is not allowed by Access-Control-Allow-Origin
错误。我无法判断 jQuery / Tornado 的哪一侧(或两者?)我没有正确设置。
根据开发工具,这些是 jQuery 请求发送的标头:
请求标头
Accept:*/*
Origin:http://www.othermachine.com
Referer:http://www.othermachine.com/athletes.html?src=BCYQ&msgid=6xjb
User-Agent:Mozilla/5.0 ...
如果我只是从浏览器的 url 字段中发出请求,我会得到“200 OK”:
响应标头
Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:Content-Type, User-Agent, X-Requested-With, X-Requested-By, Cache-Control
Access-Control-Allow-Methods:GET,POST
Access-Control-Allow-Origin:http://www.othermachine.com
Content-Length:0
Content-Type:text/html; charset=UTF-8
Server:TornadoServer/2.2.1
这是否意味着 Tornado 正在做它的工作?我试图遵循所有 stackoverflow CORS+jQuery 帖子(例如this)的建议,但无济于事。概念上的 CORS 似乎很简单,但也许我从根本上误解了 CORS 交易中应该发生的事情......请帮忙!提前致谢。