Question

我正在用python3构建一个非常基本的留言板服务器。 POST请求用于向服务器提交消息。服务器向客户端提供包含消息内容的新页面。当我将文本字段留空并且实际上没有为我的请求后提交数据时，会出现问题。出于某种原因，我在POST处理程序方法中出错。服务器出现以下错误，但未退出：

Exception happened during processing of request from ('127.0.0.1', 61710)
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 317, in _handle_request_noblock
    self.process_request(request, client_address)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 348, in process_request
    self.finish_request(request, client_address)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 361, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 696, in __init__
    self.handle()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/server.py", line 418, in handle
    self.handle_one_request()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/server.py", line 406, in handle_one_request
    method()
  File "MessageboardPartThree.py", line 30, in do_POST
    message = parse_qs(data)["message"][0]
KeyError: 'message'
----------------------------------------
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 61713)
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 317, in _handle_request_noblock
    self.process_request(request, client_address)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 348, in process_request
    self.finish_request(request, client_address)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 361, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/socketserver.py", line 696, in __init__
    self.handle()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/server.py", line 418, in handle
    self.handle_one_request()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/server.py", line 406, in handle_one_request
    method()
  File "MessageboardPartThree.py", line 30, in do_POST
    message = parse_qs(data)["message"][0]
KeyError: 'message'
----------------------------------------

浏览器出现以下错误：

此页面无效 localhost没有发送任何数据。

代码：

Python 3：

from http.server import HTTPServer, BaseHTTPRequestHandler
from urllib.parse import parse_qs


class MessageHandler(BaseHTTPRequestHandler):
    def do_POST(self):
        # 1. How long was the message?
        length = int(self.headers.get('Content-length', 0))

        # 2. Read the correct amount of data from the request.
        data = self.rfile.read(length).decode()

        # 3. Extract the "message" field from the request data.
        message = parse_qs(data)["message"][0]

        # Send the "message" field back as the response.
        self.send_response(200)
        self.send_header('Content-type', 'text/plain; charset=utf-8')
        self.end_headers()
        self.wfile.write(message.encode())

if __name__ == '__main__':
    server_address = ('', 8000)
    httpd = HTTPServer(server_address, MessageHandler)
    httpd.serve_forever()

HTML：

<!DOCTYPE html>
  <title>Message Board</title>
  <form method="POST" action="http://localhost:8000/">
    <textarea name="message"></textarea>
    <br>
    <button type="submit">Post it!</button>
  </form>

POST处理程序方法错误

0 个答案: