Question

我已经使用flask建立了一个非常基本的websocket服务器。

websocket.py

from flask import Flask
from flask_uwsgi_websocket import GeventWebSocket
app = Flask(__name__)
ws = GeventWebSocket(app)
@app.route('/')
def index():
    return render_template('index.html')
@ws.route('/foobar')
def echo(wscon):
    msg = wscon.receive()
    if msg is not None:
        wscon.send(msg)
if __name__ == '__main__':
    app.run(gevent=1000, host='0.0.0.0', port=9090)

的index.html

<html>
    <head>
        <script language="Javascript">
            var s = new WebSocket("ws://192.168.3.49:9090/foobar");
            s.onopen = function() {
                alert("connected !!!");
                s.send("js send to server");
            };
            s.onmessage = function(e) {
                alert("recv message")
                var bb = document.getElementById('blackboard')
                var html = bb.innerHTML;
                bb.innerHTML = html + '<br/>' + e.data;
            };

            s.onerror = function(e) {
                alert('error');
                alert(e);
            }

            s.onclose = function(e) {
                alert("connection closed");
            }

            function invia() {
                var value = document.getElementById('testo').value;
                alert(value);
                s.send(value);
            }
        </script>
    </head>
    <body>
        <h1>WebSocket</h1>
        <input type="text" id="testo"/>
        <input type="button" value="invia" onClick="invia();"/>
        <div id="blackboard" style="width:640px;height:480px;background-color:black;color:white;border: solid 2px red;overflow:auto">
        </div>
    </body>

当我访问http://ip:9090时，我收到了打击信息：

连接!!!

recv message

连接关闭

为什么websocket自动关闭？偶尔也会出现错误

[uwsgi-http key：192.168.3.49：9090 client_addr：192.168.3.1 client_port：9177] hr_instance_read（）：由对等方重置连接 [plugins / http / http.c第646行]

Answer 1

好像你正在尝试使用echo gevent服务器。 Example code

您需要通过循环保持连接运行。改变如下：

@ws.route('/foobar') def echo(ws): while True: msg = ws.receive() print(msg) if msg is not None: ws.send(msg) else: return

为什么我的WebSocket会自动关闭使用Flask？

1 个答案: