wireshark 抓本地回环包抓不到。安装一个插件就可以了  Npcap

 

我的安装过程

1. 安装Npcap    官网   https://nmap.org/download.html              安装的时候 记得勾选 legacy loopback support for   这个选项

2. 安装wireshark 默认安装就行

3. 安装完成后运行 wireshark  选择网卡  就可以抓到本地回环包了

   

 

 

 

 

 

linux 上wireshark 抓包    

 tshark -i eth0 -w  /tmp/dump.pcap       抓包

因为本人在做测试的原因，所以目前来讲是由本地模拟websocket服务器发送信息，代码如下：
a = [['{"type":"connected"}', 0.02992081642150879], [
    '{"name": "jinku00", "_create_time": "1597808952003668224", "id": "video_info:162c8ec6bb1e2900", "type": "video_create"}',
    12.115244626998901], [
         '{"num": "1", "ware_house_num": "0", "other": "0", "part": "0", "numid": "1", "ware_houseid": "0", "otherid": "0", "partid": "0", "_create_time": "1597808953300124160", "video_id": "video_info:162c8ec6bb1e2900", "type": "video_data", "time": 0.7333333333333333, "boxes": [{"x": "0.8818798065185547", "y": "0.8039905124240452", "w": "0.10922565460205078", "h": "0.18708140055338543", "track_id": "1", "area_forbidden": "0", "area_password": "0", "time_since_update": "0", "_create_time": "1597808953299739904"}]}',
         13.412984371185303], [
         '{"num": "0", "ware_house_num": "0", "other": "0", "part": "7", "numid": "0", "ware_houseid": "0", "otherid": "0", "partid": "-1", "_create_time": "1597809235015614720", "video_id": "video_info:162c8ec6bb1e2900", "type": "video_data", "time": 193.4, "boxes": [{"x": "0.8702903747558594", "y": "0.7768634937427662", "w": "0.12263660430908203", "h": "0.21259403935185187", "track_id": "1", "area_forbidden": "0", "area_password": "0", "time_since_update": "39", "_create_time": "1597809235014929920"}, {"x": "0.850169817606608", "y": "0.8524787055121528", "w": "0.08584976196289062", "h": "0.13751458062065972", "track_id": "2", "area_forbidden": "0", "area_password": "0", "time_since_update": "15", "_create_time": "1597809235015261440"}, {"x": "0.7672754923502604", "y": "0.8550824200665509", "w": "0.10524253845214844", "h": "0.13947324399594907", "track_id": "3", "area_forbidden": "0", "area_password": "0", "time_since_update": "32", "_create_time": "1597809235015441408"}]}',
         295.1296503543854], ['{"type": "video_finish", "id": "video_info:162c8ec6bb1e2900"}', 295.18749618530273]]
print(len(a))
b = 0
import asyncio
import json
import random
import ast
import time
import asyncio
import websockets

time1 = time.time()
timehelp = 0
USERS = set()


async def echo(websocket, path):
    try:
        USERS.add(websocket)
        tt = {"type": "connected"}
        await websocket.send(json.dumps(tt))
        global b
        global timehelp
        while (True):
            # if(time.time()-time1>a[b][1]-173):
            # await asyncio.wait([user.send(json.dumps(ast.literal_eval(a[b][0]), ensure_ascii=False)) for user in USERS])
            print(a[b][1])
            await websocket.send(json.dumps(ast.literal_eval(a[b][0]), ensure_ascii=False))
            timehelp = a[b][1]
            b += 1
            # if (b == 1460):
            #     b = 0
            await  asyncio.sleep(0.001)
    finally:
        USERS.remove(websocket)


start_server = websockets.serve(echo, "127.0.0.1", 3456)
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()

当然，数据没有全部上完,同时做了个接收端
#!/usr/bin/env python

# WS client example
import ast
import asyncio
import time

import websockets

a = []
b = 0
time1 = time.time()


async def hello():
    global b
    uri = "ws://localhost:3456"
    async with websockets.connect(uri) as websocket:  # 协程函数
        while (True):
            greeting = await websocket.recv()
            a.append([greeting, time.time() - time1])
            b += 1
            print(1)
            # if (b > 100):
            #     print(a)
            #     print()
            #     exit(0)
            print(ast.literal_eval(greeting).get('type'))
            if (ast.literal_eval(greeting).get('type') == "video_finish"):
                with open('d.text', "wb+") as f:
                    f.write(bytes(str(a), encoding="utf-8"))
                print(a)
                print()
                exit(0)


asyncio.get_event_loop().run_until_complete(hello())

可以通过这样来查看自己websocket服务发送的信息，能够更加方便的进行排错

以上仅为个人学习笔记，谨慎参考

今天用C#编写了一个Chrome Remote Debugger的客户端程序，发现使用rest和websocket程序时第一次连接的时候特别慢，大概每次都要消耗一秒左右，而用chrome直接连接却没有这种情况。
由于后续编写蜘蛛时也经常要调试，每次多消耗两秒觉得开销有点大，便准备着手解决它。
最开始以为是webproxy的问题，后来查看了一下，确实没有代理。便用Fiddler模拟了一下rest请求试了一下，它也需要一秒左右。便对比了一下chrome和fiddler的请求包，发现Request的Url有所不同：
Chrome用的Host是127.0.0.1：http://127.0.0.1:9222/
				
Fiddler用的Host是localhost：http://localhost:9222/
				
于是便将程序中的请求也改成了127.0.0.1，我的程序便也变快了。
解决了问题后，回头来再分析一下原因，最开始以为是我的dns解析出问题了，试了一下，解析localhost是很快的，地址也是正常的。于是我便自己写了一个websocket server自己尝试连接了一下试试，发现出现了同样的现象：服务器和客户端一个使用localhost，一个使用127.0.0.1的时候，就会出现一秒左右的连接延迟，一致的时候就是正常的。
看来这个并不是Server端Chrome的问题，解决方式也知道了。至于是不是协议规定的，目前还没有时间详细研究，后续有空再继续研究一下。

1官网下载 安装包

官网链接:http://websocketd.com/

将下载下来的文件进行解压，解压之后可以看到里面有一个.exe的执行文件



然后配置环境变量path，径路指向websocket的可执行文件所在路径，这样就可以直接使用websocketd的命令了