龙卷风，JavaScript，本地主机，空响应
[英]tornado, javascript, localhost, empty responce
问题描述
I have a simple local tornado server with python code: 
我有一个带有python代码的简单本地龙卷风服务器：
import tornado.ioloop
import tornado.web
from tornado.options import define, options, parse_command_line
define("port", default=8888, help="run on the given port", type=int)
class MainHandler(tornado.web.RequestHandler):
@tornado.web.asynchronous
def get(self):
self.write("This is your response. " + self.get_argument("a", "hi"))
self.finish()
app = tornado.web.Application([
(r'/', MainHandler),
])
if __name__ == '__main__':
parse_command_line()
app.listen(options.port)
tornado.ioloop.IOLoop.instance().start()
and html-page: 和html页：
<html>
<head>
<script type="text/javascript">
function confirmGetMessage() {
var xhr = new XMLHttpRequest();
xhr.open("GET", "http://127.0.0.1:8888/?a=mytest", true);
xhr.onreadystatechange = function() {
alert("resp text = " + xhr.responseText);
alert("state = " + xhr.readyState);
alert("status = " + xhr.status);
}
xhr.send();
}
</script>
</head>
<body>
<form>
<input type="button" onclick="confirmGetMessage()" value="Click me for some reason" />
</form>
</body>
</html>
If I open this page in the browser and press the button, the result is: 如果我在浏览器中打开此页面并按下按钮，则结果为：
resp text =
state = 4
status = 0
But if I go to http://127.0.0.1:8888/?a=test in the browser, I have a text "This is your response. test". 但是，如果我在浏览器中转到http://127.0.0.1:8888/?a=test ，则会显示文本“这是您的响应。测试”。
I tried to put javascript function into an external file, but the result is the same. 我试图将javascript函数放到一个外部文件中，但是结果是一样的。 Why I can't get answer through XMLHttpRequest and what should I do to get it? 为什么我无法通过XMLHttpRequest得到答案，应该怎么做？
1 个解决方案
解决方案1
0 2015-11-01 22:17:36
I added 我加了
def set_default_headers(self):
self.add_header('Access-Control-Allow-Origin', self.request.headers.get('Origin', '*'))
self.add_header('Access-Control-Request-Method', 'POST')
to MainHandler. 到MainHandler。
self.add_header('Access-Control-Request-Method', 'POST')
resolved this problen and 解决了这个问题
self.add_header('Access-Control-Allow-Origin', self.request.headers.get('Origin', '*'))
allowed me to work with tornado from chrome extension. 允许我与Chrome扩展程序中的龙卷风一起工作。 Actually, I don't understand exactly what it means. 其实，我不知道这到底意味着什么。
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