dns | 易学教程

Non-blocking (async) DNS resolving in Java

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问题 Is there a clean way to resolve a DNS query (get IP by hostname) in Java asynchronously, in non-blocking way (i.e. state machine, not 1 query = 1 thread - I'd like to run tens of thousands queries simultaneously, but not run tens of thousands of threads)? What I've found so far: Standard InetAddress.getByName() implementation is blocking and looks like standard Java libraries lack any non-blocking implementations. Resolving DNS in bulk question discusses similar problem, but the only solution

Why is my Github-hosted site responding with HTTP 302 instead of 200?

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问题 I own the domain penkov.id.au. I host a blog using github, with an A record for the subdomain michael.penkov.id.au pointing to the github pages server (204.232.175.78). bash-3.2$ dig michael.penkov.id.au +nocomments +nocmd +nostats ; <<>> DiG 9.8.3-P1 <<>> michael.penkov.id.au +nocomments +nocmd +nostats ;; global options: +cmd ;michael.penkov.id.au. IN A michael.penkov.id.au. 86400 IN A 204.232.175.78 penkov.id.au. 14399 IN NS ns1.linode.com. penkov.id.au. 14399 IN NS ns5.linode.com. penkov

405 (Method Not Allowed) on AJAX request only when using DNS

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问题 I have a really weird problem, I use AJAX to send an email from my html page, which links to a PHP page I have within the SAME website. The AJAX request works fine when I enter the website in IP mode 1xx.xx.xxx.xxx:8080/mywebsite only when I use a DNS that links to this IP address I get this error : POST http://www.mywebsite.ma/sendEmail.php 405 (Method Not Allowed) Here's the AJAX request : $.ajax({ type: "POST", url: "sendEmail.php", data: datastr, cache: false, success: function(html){ if

.htaccess domain redirect

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问题 I have a server which has 3 domains all pointing to it. All domains are on the same website. www.domain1.com www.domain2.com www.domain3.com How can I redirect www.domain3.com to www.domain3.com/test.html using .htaccess? Thanks! 回答1: In your .htaccess, put: RewriteEngine On RewriteCond %{http_host} ^www\.domain3\.com [NC] RewriteRule ^(.*)$ http://www.domain3.com/test.html [R=301,NC] That should do it. 回答2: In your domain3 's .htaccess, put: RedirectPermanent / http://www.domain2.com/test

Browser Support Unicode URL

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问题 What is the browser support for having images, links, scripts... containing unicode characters in the domain name? For example does IE5+, chrome, firefox, opera, safari, and mobile browsers (Dolfin, Blackberry Webkit, MicroB, Phantom, IEMobile...) all support the following statement? <script src=☺.com/s.js></script> Just attempting to understand the portability of the above statement. 回答1: Wikipedia's Internationalized domain name article says this: Mozilla 1.4, Netscape 7.1, Opera 7.11 were

DNS Lookup in PHP

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问题 I have a Windows server that is intermittently losing the ability to lookup DNS information. I'm trying to get to the root cause of the problem but in the mean time I'd like to be able to monitor whether the server can perform lookups. Basically, it should attempt to lookup some common hostnames and the display 'Success' if the lookups are successful. The site runs PHP so I'd prefer that the monitor script be in PHP but if someone knows how to do this in ASP / .Net that would work as well.

Why all *.dev domains target to my localhost?

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问题 When you type *.dev domains, for example juas.dev it points to localhost, someone know why ? (My hosts are not modified, and the request dont go outside) 回答1: Do a lookup for a TXT record at that name and things will become clearer :-) .DEV is a recently registered top-level domain, and currently in an initial period where it's seeded with data meant to alert people using it privately that they're about to have a problem. Part of that is to return only the address 127.0.53.53, which is

mysql常用错误总结

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错误1 Lost connection to MySQL server at 'waiting for initial communication packet 原因分析： mysql开启了DNS的反向解析功能，这样mysql对连接的客户端会进行DNS主机名查找。 mysql处理客户端解析过程： 1）当mysql的client连过来的时候，服务器会主动去查client的域名。 2）首先查找 /etc/hosts 文件，搜索域名和IP的对应关系。 3）如果hosts文件没有，则查找DNS设置，进行DNS反向解析，直到timeout连接失败。 mysql的DNS反向解析： 1）mysql接收到连接请求后，获得的是客户端的ip，为了更好的匹配mysql.user里的权限记录（某些是用hostname定义的）。 2）如果mysql服务器设置了dns服务器，并且客户端ip在dns上并没有相应的hostname，那么这个过程很慢，导致连接等待。解决方法 1.在mysql配置文件(my.cnf 默认路径/etc/my.cnf)添加skip-name-resolve禁用dns解析（推荐使用） > ... > skip-name-resolve 2. 把client的ip写在mysql服务器的/etc/hosts文件里，随便给个名字做主机映射即可。 my.cnf配置的几个参数： skip-name

Extraction of TLD from urls and sorting domains and subdomains for each TLD file

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问题 I have a list of million urls. I need to extract the TLD for each url and create multiple files for each TLD. For example collect all urls with .com as tld and dump that in 1 file, another file for .edu tld and so on. Further within each file, I have to sort it alphabetically by domains and then by subdomains etc. Can anyone give me a head start for implementing this in perl? 回答1: Use URI to parse the URL, Use its host method to get the host, Use Domain::PublicSuffix's get_root_domain to

How do I route by domain / subdomain in rails

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问题 I looked at subdomain-fu and it looks pretty easy to route all non-www and non-'' subdomain requests to a single controller. But I also, need to send all external domains that are CNAME'd to my domain to the same controller. I have done a lot of searching and I can't find anything. Summarized, if it is a subdomain on my domain it goes to Catchall controller, if it is any other domain than my domain, it goes to the same Catchall controller. I am going nuts on this, any help would be