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C# How can I check if a URL exists/is valid?

... // fine, no content downloaded string s1 = client.DownloadString("http://google.com"); // throws 404 string s2 = client.DownloadString("http://google.com/silly"); } You would try/catch around the DownloadString to check for errors; no error? It exists... With C# 2.0 (VS2005): ...
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How to handle AccessViolationException

... or how's here. Read this article about CSE's in the .NET 4.0 Framework: http://msdn.microsoft.com/en-us/magazine/dd419661.aspx#id0070035 But there is hope. There are a few ways to get around this: Recompile as a .NET 3.5 assembly and run it in .NET 4.0. Add a line to your application's config...
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How to create a loop in bash that is waiting for a webserver to respond?

...his worked for me: until $(curl --output /dev/null --silent --head --fail http://myhost:myport); do printf '.' sleep 5 done share | improve this answer | follow ...
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How to enable C++11/C++0x support in Eclipse CDT?

...promotion]: I wrote my own more detailed instructions based on the above. http://scrupulousabstractions.tumblr.com/post/36441490955/eclipse-mingw-builds Thanks to the user Nobody at https://stackoverflow.com/a/13635080/1149664 ...
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Windows、Linux开放指定端口 - 更多技术 - 清泛网 - 专注C/C++及内核技术

.../etc/sysconfig/iptables 添加一行: -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT 重启防火墙: service iptables restart Windows Linux 端口 防火墙
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记一次LVS/Nginx环境下的访问控制 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...递用户 IP 的问题,引入了一个名为 TOA 的补丁机制,在 TCP 的三次握手阶段,通过 TCP 的 options 来传递用户 IP 和端口等信息,继而覆盖 socket 的 IP 和端口数据。 换句话说,在 RS 服务器上,从 iptables 的角度看,因为 NAT 的缘故,...
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Windows 10 VPN 如何去掉默认远程网关 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...然需要用到新的VPN,PPTP建立完成后,发现PPTP虚拟网卡的TCP IP V4无法编辑,也就无法去掉默认网关功能。使...升级Windows 10一段时间了,突然需要用到新的VPN,PPTP建立完成后,发现PPTP虚拟网卡的TCP/IP V4无法编辑,也就无法去掉默...
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基于内网外隔离的微信推送解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...问qyapi.weixin.qq.com的80端口。当tomcat1&2发起访问请求的一个TCP会话内,整条通信链完整,可以互相推送信息,当这个TCP会话结束。qyapi.weixin.qq.com需要访问内部服务器将变得不可行,这是就需要第三部分完成 第三部分 整个...
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Sql server默认的端口是多少?如何开启远程连接? - 更多技术 - 清泛网 - ...

...s、Linux开放指定端口》。另外,开启远程连接还需要启用TCP IP,...默认是1433,可以在配置管理器中查看: 需要开放1433端口,可以参考《Windows、Linux开放指定端口》。 另外,开启远程连接还需要启用TCP/IP,然后重启服务...
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OpenSuSE 15.1 防火墙端口开放 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...如3306端口):firewall-cmd --permanent --zone=public --add-port=3306 tcp规则生效:firewall-cmd --reloadOpenSuSE 15.1添加防火墙规则(比如3306端口): firewall-cmd --permanent --zone=public --add-port=3306/tcp 规则生效: firewall-cmd --reload OpenSuSE firewall 防...