Cherrypy _cp_dispatch 带有不带斜杠的 url 的奇怪行为：POST 然后 GET答案

【问题标题】：Cherrypy _cp_dispatch strange behaviour with url without trailing slash: POST then GETCherrypy _cp_dispatch 带有不带斜杠的 url 的奇怪行为：POST 然后 GET
【发布时间】：2014-09-30 17:19:47
【问题描述】：

我正在使用 _cp_dispatch 测试 CherryPy。但是，当我发送 1 个帖子时，_cp_dispatch 会被调用两次，而不是一次。首先是预期的帖子，然后是第二次获取：为什么？

代码：

import os
import cherrypy

class WebServerApp:

    def __init__(self):
        self.index_count = 0
        self.cpdispatch_count = 0

    def __del__(self):
        self.exit()

    def _cp_dispatch(self, vpath):
        self.cpdispatch_count += 1
        cherrypy.log.error('_cp_dispatch: ' + str(vpath) + ' - index count:' + str(self.cpdispatch_count))

        if len(vpath) == 0:
            return self

        if len(vpath) == 2:
            vpath.pop(0)
            cherrypy.request.params['id'] = vpath.pop(0)
            return self
        return vpath

    @cherrypy.expose
    def index(self, **params):
        try:
            self.index_count += 1
            cherrypy.log.error('Index: received params' + str(params) + ' - index count:' + str(self.index_count))
        except Exception as e:
            cherrypy.log.error(e.message)

    def exit(self):
        cherrypy.log.error('Exiting')

    exit.exposed = True

ws_conf = os.path.join(os.path.dirname(__file__), 'verybasicwebserver.conf')
if __name__ == '__main__':
    cherrypy.quickstart(WebServerApp(), config=ws_conf)

配置文件：

[global]
server.socket_host = "127.0.0.1"
server.socket_port = 1025
server.thread_pool = 10
log.screen = True
log.access_file = "/Users/antoinebrunel/src/Rankings/log/cherrypy_access.log"
log.error_file = "/Users/antoinebrunel/src/Rankings/log/cherrypy_error.log"

有要求的帖子：

r = requests.post("http://127.0.0.1:1025/id/12345")

日志结果显示 cp_dispatch 被调用了 3 次：启动时 1 次，post 时调用 2 次p>

pydev debugger: starting (pid: 5744)
[30/Sep/2014:19:16:29] ENGINE Listening for SIGUSR1.
[30/Sep/2014:19:16:29] ENGINE Listening for SIGHUP.
[30/Sep/2014:19:16:29] ENGINE Listening for SIGTERM.
[30/Sep/2014:19:16:29] ENGINE Bus STARTING
[30/Sep/2014:19:16:29]  _cp_dispatch: ['global', 'dummy.html'] - _cp_dispatch count:1
[30/Sep/2014:19:16:29] ENGINE Started monitor thread '_TimeoutMonitor'.
[30/Sep/2014:19:16:29] ENGINE Started monitor thread 'Autoreloader'.
[30/Sep/2014:19:16:29] ENGINE Serving on http://127.0.0.1:1025
[30/Sep/2014:19:16:29] ENGINE Bus STARTED
[30/Sep/2014:19:16:34]  _cp_dispatch: ['id', '12345'] - _cp_dispatch count:2
127.0.0.1 - - [30/Sep/2014:19:16:34] "POST /id/12345 HTTP/1.1" 301 117 "" "python-requests/2.4.0 CPython/3.4.1 Darwin/13.3.0"
[30/Sep/2014:19:16:34]  _cp_dispatch: ['id', '12345'] - _cp_dispatch count:3
[30/Sep/2014:19:16:34]  Index: received params{'id': '12345'} - index count:1
127.0.0.1 - - [30/Sep/2014:19:16:34] "GET /id/12345/ HTTP/1.1" 200 - "" "python-requests/2.4.0 CPython/3.4.1 Darwin/13.3.0"

知道为什么 _cp_dispatch 会为单个帖子调用两次吗？

-- 编辑我怀疑某些 301 重定向出现在内部，因为它出现在日志中。

【问题讨论】：

标签： rest python-3.x cherrypy

【解决方案1】：

在cherrypy中，当url不以斜杠结尾时会发生内部重定向。 https://cherrypy.readthedocs.org/en/3.3.0/refman/_cprequest.html#cherrypy._cprequest.Request.is_index

有两种方法可以解决“问题”：

首先显然是发帖到http://example.com/id/12345/

其次是在配置文件中添加以下内容：

tools.trailing_slash.on = False

https://cherrypy.readthedocs.org/en/3.2.6/concepts/config.html

【讨论】：

tools.trailing_slash.on = False 是我所追求的。谢谢！（上下文：我不想让客户端记住斜杠，尤其是从匿名用户的浏览器调用时）。