Python网络服务器未正常运行

Question

我正在构建一个基本的python web服务器，但我一直遇到一个问题，即它不发送任何数据（通过访问与它运行在同一台计算机上的网站的方式，我有服务器尝试访问的文件），下面是我的代码：

import socket

HOST, PORT = '', 80

def between(left,right,s):
    before,_,a = s.partition(left)
    a,_,after = a.partition(right)
    return a

filereq = ""
listen_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
listen_socket.bind((HOST, PORT))
lines = []
print("Started!")
listen_socket.listen(1)
print("Listening")
while True:
        try:
                lines = []
                client_connection, client_address = listen_socket.accept()
                print("Connected")
                request = client_connection.recv(1024)
                print("Received Data!")
                filereq = between("GET /", " HT", request)
                print(filereq)
                filereq = open(filereq)
                for line in filereq:
                        lines.append(line)
                print(lines)
                sendata = ''.join(lines)
                print(sendata)
                http_response = """\
                HTTP/1.1 200 OK 

                {}
                """.format(sendata)
                print(http_response)
                client_connection.sendall(http_response)
                print("Sent the Data!")
                client_connection.close()
                print("Connection Closed!")
        except:
                5+5

Answer 1

问题是服务器是用Python3实现的，但是代码混合了字节和字符串，这在Python2中有效，但在Python3中无效。你知道吗

这会导致between函数出错，因为正在对bytes对象调用partition，但提供了str分隔符值。你知道吗

>>> data = b'abc'
>>> data.partition('b')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: a bytes-like object is required, not 'str'

要解决此问题，请在从套接字读取时将数据从bytes解码到str，然后在发送响应之前将数据编码回bytes（socket.sendall期望bytes作为参数）。你知道吗

另外，打印出发生的任何异常，以便可以调试它们。你知道吗

import socket
import sys
import traceback

HOST, PORT = '', 80

def between(left,right,s):
    before,_,a = s.partition(left)
    a,_,after = a.partition(right)
    return a

filereq = ""
listen_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
listen_socket.bind((HOST, PORT))
lines = []
print("Started!")
listen_socket.listen(1)
print("Listening")
while True:
        try:
                lines = []
                client_connection, client_address = listen_socket.accept()
                print("Connected")
                request = client_connection.recv(1024)
                print("Received Data!")

                # Decode the data before processing.
                decoded = request.decode('utf-8')
                filereq = between("GET /", " HT", decoded)
                print(filereq)
                filereq = open(filereq)
                for line in filereq:
                        lines.append(line)
                print(lines)
                sendata = ''.join(lines)
                print(sendata)
                http_response = """\
                HTTP/1.1 200 OK 

                {}
                """.format(sendata)
                print(http_response)

                # Encode the response before sending.
                encoded = http_response.encode('utf-8')
                client_connection.sendall(encoded)
                print("Sent the Data!")
                client_connection.close()
                print("Connection Closed!")
        except Exception:
                # Print the traceback if there's an error.
                traceback.print_exc(file=sys.stderr)