python之为什么这个程序挂起

我正在粘贴整个代码，因为我认为它尽可能短；

import socket 
 
def recv_all(sock): 
    parts = [] 
    while True: 
        msg = "" 
        msg = sock.recv(4096) 
        print "recieved", len(msg), "bytes." 
        if not msg: 
            break 
        parts.append(msg) 
    return "".join(parts) 
 
http_request = """GET / HTTP/1.1 
Host: {} 
User-Agent: Opera/9.80 (Windows NT 6.1; WOW64; U; tr) Presto/2.10.229 Version/11.64 
Accept: text/html, application/xml;q=0.9, application/xhtml xml, image/png, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1 
Accept-Language: en 
Accept-Charset: iso-8859-1, utf-8, utf-16, *;q=0.1 
Accept-Encoding: deflate, gzip, x-gzip, identity, *;q=0 
Connection: Keep-Alive, TE 
TE: deflate, gzip, chunked, identity, trailers 
 
 
""" 
site = "www.google.com.tr" 
print "creating connection" 
conn = socket.create_connection((site,80)) 
print "sending data" 
conn.sendall(http_request.format(site)) 
print "recieving response" 
response = recv_all(conn) 
print "closing connection" 
conn.close() 
 
print response 

当我运行它时，我得到了这个输出；

creating connection 
sending data 
recieving response 
recieved 3743 bytes. 
recieved 4096 bytes. 
recieved 4096 bytes. 
recieved 4096 bytes. 
recieved 3472 bytes. 
recieved 1648 bytes.

我期望它做的是在读取最后一个 block (在本例中为 1648)后读取 0 个字节。但它一直在等待。

我在 Windows 7 上使用 Python 2.7。

我在这里做错了什么？我应该怎么做才能使其按预期工作？