python - 通过 python 从 HTTP 检索图像

Question

我对 Python 有点陌生，但我真的很想知道，那是什么意思。

在我的书中，我有一个代码:

import socket
import time
HOST = 'data.pr4e.org'
PORT = 80
mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
mysock.connect((HOST, PORT))
mysock.sendall(b'GET http://data.pr4e.org/cover3.jpg HTTP/1.0\r\n\r\n')
count = 0
picture = b""
while True:
    data = mysock.recv(5120)
    if len(data) < 1: break
    #time.sleep(0.25)
    count = count + len(data)
    print(len(data), count)
    picture = picture + data
    mysock.close()
    # Look for the end of the header (2 CRLF)
    pos = picture.find(b"\r\n\r\n")
    print('Header length', pos)
    print(picture[:pos].decode())
    # Skip past the header and save the picture data
    picture = picture[pos+4:]
    fhand = open("stuff.jpg", "wb")
    fhand.write(picture)
    fhand.close()

响应是:

$ python urljpeg.py
5120 5120
5120 10240
4240 14480
5120 19600
...
5120 214000
3200 217200
5120 222320
5120 227440
3167 230607
Header length 393
HTTP/1.1 200 OK
Date: Wed, 11 Apr 2018 18:54:09 GMT
Server: Apache/2.4.7 (Ubuntu)
Last-Modified: Mon, 15 May 2017 12:27:40 GMT
ETag: "38342-54f8f2e5b6277"
Accept-Ranges: bytes
Content-Length: 230210
Vary: Accept-Encoding
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Connection: close
Content-Type: image/jpeg

我想知道: - 响应开头的这些数字是什么意思？ - 谁能推荐一个资源来阅读有关为假人检索图像的信息？

Answer 1

它们是

的结果

print(len(data), count)

分别是数据的长度和目前为止接收到的数据总数。