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非阻塞IO发送http请求

import socket
from urllib.parse import urlparse
from selectors import DefaultSelector, EVENT_READ, EVENT_WRITE
def get_url(url):
#通过socket请求html
url = urlparse(url)
host = url.netloc
path = url.path
if path == "":
path = "/"

#建立socket连接
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.setblocking(False)
try:
#如果不try的话 则会有异常,因为链接还没建立好
#BlockingIOError: [WinError 10035] 无法立即完成一个非阻止性套接字操作。
client.connect((host, 80)) #阻塞不会消耗cpu
except BlockingIOError as e:
pass

#不停的询问连接是否建立好, 需要while循环不停的去检查状态
#做计算任务或者再次发起其他的连接请求

while True:
try:
#发送http请求
#请求行\r\n请求头\r\n\r\n请求体
client.send("GET {} HTTP/1.1\r\nHost:{}\r\nConnection:close\r\n\r\n".format(path, host).encode("utf8"))
break
except OSError as e:
pass


data = b""
while True:
try:
d = client.recv(1024)
except BlockingIOError as e:
continue
if d:
data += d
else:
break

data = data.decode("utf8")
html_data = data.split("\r\n\r\n")[1]
print(html_data)
client.close()


get_url('http://www.baidu.com')

 响应结果:

响应行\r\n

响应头\r\n

...........\r\n

...........\r\n

...........

\r\n\r\n

响应体


"C:\Program Files\python3.5\python.exe" E:/pythoncode/day07/01.py
HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: no-cache
Content-Length: 14615
Content-Type: text/html
Date: Thu, 16 Aug 2018 08:52:32 GMT
Etag: "5b56b4a8-3917"
Last-Modified: Tue, 24 Jul 2018 05:10:00 GMT
P3p: CP=" OTI DSP COR IVA OUR IND COM "
Pragma: no-cache
Server: BWS/1.1
Set-Cookie: BAIDUID=DCD58464E426E409DBF02803181718DB:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: BIDUPSID=DCD58464E426E409DBF02803181718DB; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: PSTM=1534409552; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Vary: Accept-Encoding
X-Ua-Compatible: IE=Edge,chrome=1
Connection: close

<!DOCTYPE html><!--STATUS OK-->
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<link rel="dns-prefetch" href="//s1.bdstatic.com"/>
<link rel="dns-prefetch" href="//t1.baidu.com"/>
<link rel="dns-prefetch" href="//t2.baidu.com"/>
<link rel="dns-prefetch" href="//t3.baidu.com"/>
<link rel="dns-prefetch" href="//t10.baidu.com"/>
<link rel="dns-prefetch" href="//t11.baidu.com"/>
<link rel="dns-prefetch" href="//t12.baidu.com"/>
<link rel="dns-prefetch" href="//b1.bdstatic.com"/>


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