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iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
...a644f7&mode=download
3、之后把iTunes升级到10.6以上版本，其它软件组件勿升级，即只下载iTunes最新版安装即可，否则可能系统白装。不升级iTunes的后果是，插上iPhone无反应，不识别。
4、网上学习如何在XCode中写一个HelloWorld，并在iOS...
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...
一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术
...是一致的。
由于很多计算机世界的东西（如公钥体系、网络传输）在现实世界中并没有特别好的对等物，所以故事里难免有一些生硬和不合常理的细节。
本文描述的是比特币网络本身的技术原理和运作机制，当在如Mtgox这种买...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
...机发送及显示文字消息的标准制定计划，他们考虑到无线网络的带宽限制，消息越短越好。最终，Hillebrand坚持认为160字是最好的长度限制，短信长度的限制也由此而来。
关于160字的限制，洛杉矶时报的这篇文章解释得格外详细...
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...
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...
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...
Django connection to PostgreSQL: “Peer authentication failed”
...ets. On the other hand, when the HOST is "localhost", it connects via TCP/IP to 127.0.0.1. Likely, your pg_hba.conf is set up to deny ordinary users from connecting through UNIX sockets but allows them over TCP/IP from localhost.
– Jim Garrison
May 1 '13 at 1...