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No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin '…' is therefor
...der Instead of using setHeader method,
response.addHeader("Access-Control-Allow-Origin", "*");
* in above line will allow access to all domains.
For allowing access to specific domain only:
response.addHeader("Access-Control-Allow-Origin", "http://www.example.com");
Check this blog post.
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闲扯Nginx的accept_mutex配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...新连接，其它的Worker会重新进入休眠状态，这就是「惊群问题」。
Nginx缺省激活了accept_mutex，也就是说不会有惊群问题，但真的有那么严重么？实际上Nginx作者Igor Sysoev曾经给过相关的解释：
OS may wake all processes waiting on accept(...
MySQL ('root'@'%') does not exist 的问题 - 爬虫/数据库 - 清泛IT社区，为创新赋能！
MySQL ('root'@'%') does not exist的问题：
在使用mysql时出现问题： The user specified as a definer ('root'@'%') does not exist。
一般是由于root用户对全局host无访问权限。因此只要给root用户添加一个访问权限即可。
解决办法：
登陆mysql ，...
Git error on commit after merge - fatal: cannot do a partial commit during a merge
...t adding "-i" to the commit command fixes this problem for me. The -i basically tells it to stage additional files before committing.
That is:
git commit -i myfile.php
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Default visibility of class methods in PHP
...ithout any explicit visibility keyword are defined as public.
http://www.php.net/manual/en/language.oop5.visibility.php
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How do PHP sessions work? (not “how are they used?”)
...when his session is created.
it is stored in a cookie (called, by default, PHPSESSID)
that cookie is sent by the browser to the server with each request
the server (PHP) uses that cookie, containing the session_id, to know which file corresponds to that user.
The data in the sessions files is the ...
PHP Fatal error: Call to undefined function json_decode()
Apache is logging PHP Fatal error: Call to undefined function json_decode() . After some googling, it seems this problem is a result of not having the latest version of php. Oddly, running php --version ouputs
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大数据不是万能的 - 资讯 - 清泛网 - 专注C/C++及内核技术
...地方。我们认为，大数据其实面对的不是99%的机构面对的问题，这个说法跟市场上很多的说法不大一样。
我们看一下，把这个额度分配到一万到十万区域。在这个领域从事信贷服务的，大家马上想到的是信用卡，也可能想到某...
AsciiConversion 拓展问题：字母开头的会出现“C2”非预期字符 - App Inven...
做TCP通讯时遇到的问题，主要问题是：列表如果是字母开头就会出问题
发送这个列表
字母开头的都有这个问题，文本显示没有问题。
上面那个是程序 ，下面这个是测试工具
测试了一下：
1、ClientSocket拓展默认...
一文讲透区块链技术原理 - 资讯 - 清泛网 - 专注C/C++及内核技术
...定是可信的。
区块链技术原理的来源可归纳为一个数学问题：拜占庭将军问题。拜占庭将军问题延伸到互联网生活中来，其内涵可概括为：在互联网大背景下，当需要与不熟悉的对手方进行价值交换活动时，人们如何才能防止...