我正在使用的握手来自 http://en.wikipedia.org/w/index.php?title=WebSockets&oldid=372387414.
握手本身似乎有效,但是当我点击发送时,我收到一个javascript错误：
Uncaught Error: INVALID_STATE_ERR: DOM Exception 11
这是html：
<!doctype html>
<html>
<head>
<title>ws_json</title>
</head>
<body onload="handleLoad();" onunload="handleUnload();">
<input type="text" id='input' />
<input type="button" value="submit" onclick="handleSubmit()" />
<div id="display"></div>
<script type="text/javascript">
function showmsg(str){
display = document.getElementById("display");
display.innerHTML += "<p>" + str + "</p>";
}
function send(str){
ws.send(str.length);
ws.send(str);
}
function handleSubmit(){
input = document.getElementById('input');
send(input.value);
input.focus();
input.value = '';
}
function handleLoad(){
ws = new WebSocket("ws://localhost:8888/");
ws.onopen = function(){
showmsg("websocket opened.");
}
ws.onclose = function(){
showmsg("websocket closed.");
}
}
function handleUnload(){
ws.close();
}
</script>
</body>
</html>
这是python代码：
import socket
import threading
import json
PORT = 8888
LOCATION = "localhost:8888"
def handler(s):
print " in handler "
ip,_ = s.getpeername()
print "New connection from %s" % ip
request = s.recv(1024)
print "\n%s\n" % request
print s.getpeername()
# send response
response = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n"
response += "Upgrade: WebSocket\r\n"
response += "Connection: Upgrade\r\n"
try:
peername = s.getpeername()
response += "Sec-WebSocket-Origin: http://%s\r\n" % peername[0] # % request[request.index("Origin: ")+8:-4]
except ValueError:
print "Bad Request"
raise socket.error
response += "Sec-WebSocket-Location: ws://%s\r\n" % LOCATION
response += "Sec-WebSocket-Protocol: sample"
response = response.strip() + "\r\n\r\n"
print response
s.send(response)
while True:
length = s.recv(1)
print length
if not length:
break
length = int(length)
print "Length: %i" % length
data = s.recv(length)
print "Received: %s" % data
print ""
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
s.bind(('localhost',PORT))
s.listen(5)
print "server is running..."
while True:
sock,addr = s.accept()
threading.Thread(target=handler,args=(sock,)).start()
有谁知道我在这里做错了什么？
解决方法
Firefox can’t establish a connection
to the server at ws://localhost:8888/.
这可能是WebSocket对象被销毁的原因.我怀疑你的握手响应丢失了,所以Firefox正在关闭套接字.
来自Wikipedia上关于Websockets的文章：
The Sec-WebSocket-Key1 and
Sec-WebSocket-Key2 fields and the
eight bytes after the fields are
random tokens which the server uses to
construct a 16 byte token at the end
of its handshake to prove that it has
read the client’s handshake.
您的服务器响应底部没有此特殊编号,因此我认为我们需要弄清楚如何生成它并包含它.
编辑：如何生成该数字
让我们从key1,key2和握手结束时的8个字节开始
key1 = "18x 6]8vM;54 *(5: { U1]8 z [ 8"
key2 = "1_ tx7X d < nw 334J702) 7]o}` 0"
end8 = "Tm[K T2u"
我们通过忽略每个不是数字0-9的字符为每个键创建一个数字.在Python中：
def numFromKey(key):
return int(filter(lambda c: c in map(str,range(10)),key))
接下来我们将该数字除以原始键字符串中的空格数,因此这里是一个计算字符串中空格的函数.
def spacesIn(key):
return len(filter(lambda c: c==' ',key))
键产生的两个数字是：
pkey1 = numFromKey(key1)/spacesIn(key1) pkey2 = numFromKey(key2)/spacesIn(key2)
现在我们需要连接pkey1,pkey2和end8的字节.处理后的密钥需要表示为32位Big-Endian数字.
from struct import pack
catstring = pack('>L',pkey1) + pack('>L',pkey2) + end8
然后我们采用这些字节的md5哈希值来获得在握手结束时我们处理的幻数
import md5 magic = md5.new(catstring).digest()
多数民众赞成我认为它至少有用
