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Difference between socket and websocket?
...g to Application Server over a protocol similar to HTTP that runs over TCP/IP. So they are primarily for Web Applications that require a permanent connection to its server. On the other hand, plain sockets are more powerful and generic. They run over TCP/IP but they are not restricted to browsers or...
PDB文件：每个开发人员都必须知道的 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...PDB文件
大部分的开发人员应该都知道PDB文件是用来帮助软件的调试的。但是他究竟是如何工作的呢，我们可能并不熟悉。本文描述了PDB文件的存储和内容。同时还描 述了debugger如何找到binay相应的PDB文件，以及debugger如何找到与...
node and Error: EMFILE, too many open files
... FD TYPE DEVICE SIZE/OFF NODE NAME
...
nodejs 12211 root 1012u IPv4 151317015 0t0 TCP 10.101.42.209:40371->54.236.3.170:80 (ESTABLISHED)
nodejs 12211 root 1013u IPv4 151279902 0t0 TCP 10.101.42.209:43656->54.236.3.172:80 (ESTABLISHED)
nodejs 12211 root 1014...
大数据能否拯救中国足球？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...表示：“希望俱乐部能在球场增加先进的采集设备，实时监控球员的训练情况，能够及时为教练员和球队技术小组提供第一手相关数据资料。”
大数据到底在足球比赛中有多重要？郑明表示：“现代专业足球数据分析对于职业...
Maximum on http header values?
...y to define the custom max size of the header ?
– Sudip Bolakhe
Apr 30 '19 at 9:52
1
Be aware of ...
How to pass a user defined argument in scrapy spider
...o pass arguments to run on scrapyd replace -a with -d
curl http://your.ip.address.here:port/schedule.json -d
spider=myspider -d category='mycategory' -d domain='example.com'
The spider will receive arguments in its constructor.
class MySpider(Spider):
name="myspider"
def __init__...
Which $_SERVER variables are safe?
...hould be rejected by the web server and not cause the invocation of the script to begin with. Hence they can be considered reliable.
'HTTPS'
'REQUEST_TIME'
'REMOTE_ADDR' *
'REMOTE_HOST' *
'REMOTE_PORT' *
'SERVER_PROTOCOL'
'HTTP_HOST' †
'SERVER_NAME' †
'SCRIPT_FILENAME'
'SERVER_PORT' ‡
'SCRIP...
PHP大潮将至 PHP近年发展分析 - 创意 - 清泛网 - 专注C/C++及内核技术
...定的特点。
曾经听一个网站的技术经理说过：“如果做软件，如果要做网站就用PHP!”。当时我们都以为这个是一个笑谈，现在想起来还真是这样。目前，许多的网站项目的负责人都很信任PHP。觉得PHP在支持Web方面非常到位。
...
我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
...牙数据后，通过MOS管驱动原有遥控车的电机控制信号
软件端（App Inventor 2）
核心组件清单：
- BluetoothClient — 蓝牙连接与数据收发
- Canvas + Ball — 模拟方向盘
- Clock（定时器） — 方向盘位置到指令的轮询转换
- ListPicker — ...
Chrome DevTools Devices does not detect device when plugged in
...ools for your platform. I'm using Windows, and the steps for me were:
-Unzip the download into c:\platform-tools (I just put it here for
convenience, you can choose a different location).
-Open command prompt (run as administrator) in folder, and run the
following command:
adb devices
(Th...