Python 3.x Python3：从套接字读取线路时由对等方重置连接

运行此python3脚本时，我收到一条由对等方重置连接的

错误消息：

import struct, socket

HOST = "127.0.0.1"
PORT = 64012

# read bytes from socket and return it as ascii representation
def read_line_from_socket(s): 
    buf= ""
    while True:
        byteData = s.recv(1)
        if byteData == b"\n":
            break
        buf += byteData.decode("ascii")
    return buf

def read_four_longs_for_addition(s):
    sum = 0
    counter = 1
    while counter <= 4:
        sum += struct.unpack("I", s.recv(4))[0]
        counter += 1 # python does not support ++, += 1 has to be used
    print(sum) # sum overflows int (number > 32 bit)
    return sum

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST,PORT))
    print(read_line_from_socket(s))
    print(read_line_from_socket(s))
    s.send(struct.pack("l", read_four_longs_for_addition(s)))
    # print(s.recv(32)) # receives "You have succes..", NOT resulting in an Connection reset by peer which indicates success
    print(read_line_from_socket(s)) # results in "Connection reset by peer"
    s.close()

查看带有
strace python3 nameOfPythonScript.py
的流程，我看不出任何问题，一切都应该正常工作：

recvfrom(3, "n", 1, 0, NULL, NULL)      = 1
recvfrom(3, "e", 1, 0, NULL, NULL)      = 1
recvfrom(3, "!", 1, 0, NULL, NULL)      = 1
recvfrom(3, "\n", 1, 0, NULL, NULL)     = 1
write(1, "You have successfully passed thi"..., 52You have successfully passed this level, well done!
) = 52
close(3)                                = 0
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7ffff7bcd0c0}, {sa_handler=0x5555557d8980, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7ffff7bcd0c0}, 8) = 0
munmap(0x7ffff6c0e000, 262144)          = 0
exit_group(0)                           = ?
+++ exited with 0 +++

我的问题:

为什么会发生连接重置？它是否与
返回0有关在服务器程序代码中？请注意，如果我
recv
一个固定的字节数，而不是尝试读取完整的最后一行，则不会发生错误（请参阅脚本代码中的注释）

Welcome to phoenix/net-two, brought to you by https://exploit.education
For this level, sizeof(long) == 4, keep that in mind :)
9057758327
Traceback (most recent call last):
  File "net-2.py", line 31, in <module>
    print(read_line_from_socket(s))
  File "net-2.py", line 10, in read_line_from_socket
    byteData = s.recv(1)
ConnectionResetError: [Errno 104] Connection reset by peer


recvfrom(3, "n", 1, 0, NULL, NULL)      = 1
recvfrom(3, "e", 1, 0, NULL, NULL)      = 1
recvfrom(3, "!", 1, 0, NULL, NULL)      = 1
recvfrom(3, "\n", 1, 0, NULL, NULL)     = 1
write(1, "You have successfully passed thi"..., 52You have successfully passed this level, well done!
) = 52
close(3)                                = 0
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7ffff7bcd0c0}, {sa_handler=0x5555557d8980, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7ffff7bcd0c0}, 8) = 0
munmap(0x7ffff6c0e000, 262144)          = 0
exit_group(0)                           = ?
+++ exited with 0 +++