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ping response “Request timed out.” vs “Destination Host unreachable”
When I ping an IP address, what is the difference between Request timed out and Destination host unreachable returned from the command?
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如何设置squid使外网也可以通过代理服务器上网，并且使用代理服务器的ip地...
...外网也可以通过代理服务器上网，并且使用代理服务器的ip地址按照配置文件内网可以通过服务器上网，显示的ip是本机ip，外网不能通过服务器，现在想让外网可以通过代理服务器，并且使用服务器的ip，请问...按照配置文件内...
What does .class mean in Java?
....
object.getClass() returns the class of the given object.
For example:
String string = "hello";
System.out.println(string.getClass().toString());
This will output:
class java.lang.String
This is the class of the string object :)
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Why doesn't Java support unsigned ints?
...er performance rather than assuming it to be true. It is possible that the extra jiggery-pokery required to manipulate shorts rather than ints (which is usually the type that the processor 'likes to use') could actually be detrimental to performance in a particular application. Not always, but you s...
Find the IP address of the client in an SSH session
I have a script that is to be run by a person that logs in to the server with SSH .
19 Answers
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How can I solve a connection pool problem between ASP.NET and SQL Server?
...d Close throws an exception:
var connection = new SqlConnection(connectionString);
connection.Open();
// some code
connection.Close();
The correct way would be this:
var connection = new SqlConnection(ConnectionString);
try
{
connection.Open();
someCall (connection);
}
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Do the JSON keys have to be surrounded by quotes?
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You are correct to use strings as the key. Here is an excerpt from RFC 4627 - The application/json Media Type for JavaScript Object Notation (JSON)
2.2. Objects
An object structure is represented as a pair of curly brackets
surrounding...
Why is “while ( !feof (file) )” always wrong?
... stream is still in the good() state.
C++, iostreams getline:
for (std::string line; std::getline(std::cin, line); ) {
consume(line);
}
The result we must use is again std::cin, just as before.
POSIX, write(2) to flush a buffer:
char const * p = buf;
ssize_t n = bufsize;
for (ss...
https URL with token parameter : how secure is it?
...ople having access to all the tokens.
Additionally the URL with the query string would be saved in your user's history, allowing other users of the same machine to access the URL.
Finally and what makes this very insecure is, the URL is sent in the Referer header of all requests for any resource,...
企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...浏览器将首先查找本地的DNS缓存是否拥有该域名所对应的IP地址。如果有，那么浏览器将尝试直接使用该IP地址访问该网站的内容。如果本地DNS缓存中没有该域名所对应的IP地址，那么它将向DNS发送一个请求，以获得该域名所对应...