Use*_*175 4 python cherrypy cors
创建从我的网站到运行 CherryPy 的 Python 服务器的发布请求时，我收到错误Access to XMLHttpRequest has been blocked by CORS policy: Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response.. 我可以使用“CORS Everywhere”浏览器扩展程序之一暂时解决问题，但是
这是相关的代码：
从网站发布请求调用的 CherryPy Python 函数
@cherrypy.expose
@cherrypy.tools.json_in()
def add_meeting(self):
data = None
id = None
start_time = None
end_time = None
title = None
userlist = None
result = {"operation": "request", "result": "success"}
if cherrypy.request.method == "POST":
data = cherrypy.request.json
id = data["id"]
start_time = data["start_time"]
end_time = data["end_time"]
title = data["title"]
userlist = data["userlist"]
# Rest of relevant code in function is left out, to take up less
# space and not post irrelevant code. That being said, I am
# positive the logic is correct, as it originally ran smoothly
# with a "Cors Everywhere" Browser Extension.
return result
这是我设置和运行 CherryPy 的区域
def main():
# Create the configuration file parser object and start the CherryPy server
config = ConfigParser.ConfigParser()
config.read(CONFIG_FILE)
port = config.getint('Meta', 'port')
host = config.get('Meta', 'host')
cherrypy.config.update({'server.socket_port': port,
'server.socket_host': host,
'tools.CORS.on': True})
cherrypy.quickstart(Coordinator(config))
main()
这是上面代码中提到的配置文件（CONFIG_FILE）
[Meta]
host = 0.0.0.0
port = 3000
# Rest is left out, as it is irrelevant with problem
[Meta]
host = 0.0.0.0
port = 3000
# Rest is left out, as it is irrelevant with problem
使用cherrypy.tools.CORS = cherrypy.Tool('before_handler', CORS)
2. 在上面的cherrypy.config.update 中添加“ 'cors.expose.on': True ”
3. 使用我在网上找到的这个cherrypy-cors Python 库: https://pypi.org/project/cherrypy-cors/
4. 在 Python 文件的 config.update 部分包含头文件
5. 添加 "@cherrypy.tools.accept(media='application/json') " 在 "def add_meeting" 之前
我已经分别尝试了上面的解决方案，有些有没有其他的，但我仍然被卡住了。也许其中一些解决方案是部分正确的，我的代码还需要一些额外的东西。我不确定; 我只是无法让它工作。在此之前，我在 Web 开发方面没有太多经验，所以也许（并且希望）解决方案非常简单。我知道代码有效，但如果没有为每个用户提供有效的“Cors Everywhere”浏览器扩展，我就无法运行它。
至于我正在运行的版本：我使用的是 CherryPy 14.2.0 和 Python 2.7.6
任何帮助对我来说都意味着绝对的世界，谢谢。
所以首先，您需要在处理OPTIONS请求时设置飞行前标头，您可以在那里列出允许的方法。然后，您还需要启用该cors.expose工具。
的文档字符串中cherrypy-cors有一些使用提示。例如，当使用 a 时MethodDispatcher，您可以只装饰一个OPTIONS处理程序方法，@cherrypy_cors.tools.preflight()而不是在每个 HTTP 处理程序中都这样做。
这是一个简单的遍历示例（没有方法调度程序）。要测试它，请访问http://127.0.0.1/，它将向http://localhost:3333/add_meeting发出请求，这Origin在 CORS ( 'localhost' != '127.0.0.1')方面有所不同。
"""Example of CORS setup using cherrypy-cors library."""
import cherrypy
import cherrypy_cors
# Python 2 compat: make all classes new-style by default
__metaclass__ = type # pylint: disable=invalid-name
class WebRoot:
"""Root node for HTTP handlers."""
@cherrypy.expose
def index(self): # pylint: disable=no-self-use
"""Render a web page handling request against ``/``.
Contains client JS snippet which will query the API endpoint.
It will be executed by the browser while loading the page.
"""
return """<html>
<script type="text/javascript">
async function addMeeting() {
/*
* Example coroutine for querying /add_meeing
* HTTP endpoint. It uses localhost as in the URL.
* For testing CORS, make sure to visit
* http://127.0.0.1/ which is a different origin
* from browser's perspective.
* /
const request_payload = {
some: 'data',
listed: ['h', 'er', 'e'],
}
try {
const resp = await fetch(
'http://localhost:3333/add_meeting',
{
method: 'POST',
mode: 'cors', // Required for customizing HTTP request headers
credentials: 'same-origin',
headers: {
'Content-Type': 'application/json; charset=UTF-8', // Required for ``cherrypy.tools.json_in`` to identify JSON payload and parse it automatically
},
body: JSON.stringify(request_payload),
},
)
const json_resp = await resp.json()
console.log(json_resp) // Will print: {"method": "POST", "payload": {"listed": ["h", "er", "e"], "some": "data"}}
} catch (e) {
console.warn('Exception: ' + e)
}
}
async function main() {
await addMeeting()
}
main() // Entry point
</script>
</html>""" # noqa: E501
@cherrypy.expose
@cherrypy.tools.json_in() # turn HTTP payload into an object; also checking the Content-Type header
@cherrypy.tools.json_out() # turn ``return``ed Python object into a JSON string; also setting corresponding Content-Type
def add_meeting(self):
"""Handle HTTP requests against ``/add_meeting`` URI."""
if cherrypy.request.method == 'OPTIONS':
# This is a request that browser sends in CORS prior to
# sending a real request.
# Set up extra headers for a pre-flight OPTIONS request.
cherrypy_cors.preflight(allowed_methods=['GET', 'POST'])
if cherrypy.request.method == 'POST':
return {'method': 'POST', 'payload': cherrypy.request.json}
return {'method': 'non-POST'}
def main():
"""Set up and run the web app.
Initializes CORS tools.
Sets up web server socket.
Enables the CORS tool.
"""
cherrypy_cors.install()
cherrypy.config.update({
'server.socket_host': '127.0.0.1',
'server.socket_port': 3333,
'cors.expose.on': True,
})
cherrypy.quickstart(WebRoot())
__name__ == '__main__' and main() # pylint: disable=expression-not-assigned
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