To handle Canonical URL is it best practice to do a 301 redirect or better to have the same IP Address for both www and non www domain?

For example:

Canonical URL/domain wanted is http://example.com

    Domain           | A Record
    ------------------------------------
    example.com      | 192.0.2.34
    www.example.com  | 192.0.2.34

I understand people may have a CNAME record for www (alias, given that CNAME is called Canonical Name); unsure if this is best practice compared to using the same IP address.

Or is this better.

    Domain           | A Record
    ------------------------------------
    example.com     | 192.0.2.34
    *  www.example.com 301 redirect to example.com




Domain IP address for www and non-www for Canonical URL

I have a device that is already mapped to `domain.tld`. I now want to create a wildcard for all subdomains `*.domain.tld` so that they are mapped to the ip of `domain.tld`, too.
How do I do this with `dnsmasq`?


Wildcard subdomains with dnsmasq

I bought a wildcard certificate for *.example.com. Now, I have to secure *.subdomain.example.com. Is it possible to create a sub-certificate for my wildcard-certificate? 

If it is, how I can do this?

SSL Multilevel Subdomain Wildcard

Is anyone aware of a public wildcard domain name that resolves to IP address 127.0.0.1.  For example if I wanted to test a URL locally such as mywebsite.localhost.com or example.localhost.com but I don&#39;t have control of DNS settings (hosts file or whatever) then I would use this public DNS to resolve to 127.0.0.1.  It needs to be wildcarded so that no matter whatever comes before localhost.com it still resolves to 127.0.0.1.

Public Wildcard Domain Name To Resolve To 127.0.0.1

I want to find out all the subdomains of a given domain. I found a hint which tells me to dig the authoritative Nameserver with the following option:

    dig @ns1.foo.bar some_domain.com axfr

But this never works. Has anyone a better idea/approach


How do I get a list of all subdomains of a domain?

I am using postman to test an API I have, all is good when the request does not contain sub-domain, however when I add a sub-domain to URL I am getting this response.

&gt; Could not get any response
&gt; 
&gt; There was an error connecting to http://subdomain.localhost:port/api/
&gt; 
&gt; Why this might have happened:
&gt; 
&gt; The server couldn&#39;t send a response:Ensure that the backend is working
&gt; properly
&gt; 
&gt; Self-signed SSL certificates are being blocked:Fix this by turning off
&gt; &#39;SSL certificate verification&#39; in Settings &gt; General
&gt; 
&gt; Proxy configured incorrectly Ensure that proxy is configured correctly
&gt; in Settings &gt; Proxy
&gt; 
&gt; Request timeout:Change request timeout in Settings &gt; General

If I copy the same URL from postman and paste it into the browser I get a proper response, is there some kind of configurations I should do to make postman work with sub-domains?

&quot;Could not get any response&quot; response when using postman with subdomain

Can subdomains (domain names) have underscore `_` in them?

Can (domain name) subdomains have an underscore &quot;_&quot; in it?

How do I create subdomain like http://user.mywebsite.com ? Do i have to access htaccess somehow? Is it actually simply possible to create it via pure php code or I need to use some external script-server side language?

To those who answered: Well, then, should i ask my hosting if they provide some sort of DNS access??

How to let PHP to create subdomain automatically for each user?

When browsing through the internet for the last few years, I&#39;m seeing more and more pages getting rid of the &#39;www&#39; subdomain.

Are there any good reasons to use or not to use the &#39;www&#39; subdomain?

When should one use a &#39;www&#39; subdomain?

I&#39;m replacing cookies with [localStorage][1] on browsers that can support it (anyone but IE). The problem is *site.com* and **www**.*site.com* store their own separate localStorage objects. I believe www is considered a subdomain (a stupid decision if you ask me). If a user was originally on *site.com* and decides to type in **www**.*site.com* on her next visit, all her personal data will be inaccessible. How do I get all my &quot;subdomains&quot; to share the same localStorage as the main domain?


  [1]: http://www.smashingmagazine.com/2010/10/11/local-storage-and-how-to-use-it/

use localStorage across subdomains

I have two questions. I understand that if I specify the domain as `.mydomain.com` (with the leading dot) in the cookie that all subdomains can share a cookie.

Can `subdomain.mydomain.com` access a cookie created in `mydomain.com` (without the `www` subdomain)? 

Can `mydomain.com` (without the `www` subdomain) access the cookie if created in `subdomain.mydomain.com`?

Share cookie between subdomain and domain

I am looking to create a system which on signup will create a subdomain on my website for the users account area. 

e.g. johndoe.website.com

I think it would be something to do with the .htaccess file and possibly redirecting to another location on the website? I don&#39;t actually know. But any information to start me off would be greatly appreciated.

Creating a sign up area is not the problem - I have done this many a time. I am just unsure where to start with the subdomain. 

Create subdomains on the fly with .htaccess (PHP)

I&#39;m trying to host a subdomain for my site with a different hosting company and I&#39;m running into issues on how to set it up.

Here are the specifics:
- Domain is registered with GoDaddy. 
- Nameservers are pointing to DiscountASP.net where ASP.NET app has been happily running for couple of years.
- Would like blog.mydomain.com to point to my account with DreamHost.com to take advantage of their LAMP stack.

I have added blog.mydomain.com to DreamHost (after adding mydomain.com) via their control panel. I thought I would be able to add a subdomain entry on GoDaddy to point to DreamHost, but all they allow is blog.mydomain.com = new url.

In theory I could just take our .biz or .net domain and host it on DreamHost but was hoping I could do it all with a subdomain.

So, to summarize I&#39;d like to know if what I want to do is feasible and if so, how do I go about it (given the constraints of GoDaddy, DiscountASP, &amp; DreamHost). 

Subdomain on different host

Is there a function in PHP to get the name of the subdomain? 

In the following example I would like to get the &quot;en&quot; part of the URL:

    en.example.com



PHP function to get the subdomain of a URL

Getting the subdomain from a URL sounds easy at first.

    http://www.domain.example

Scan for the first period then return whatever came after the &quot;http://&quot; ...

Then you remember

    http://super.duper.domain.example

Oh. So then you think, okay, find the last period, go back a word and get everything before! 

Then you remember

    http://super.duper.domain.co.uk

And you&#39;re back to square one. Anyone have any great ideas besides storing a list of all TLDs?

Get the subdomain from a URL

Using cpanel on my hosting account, I created a subdomain - e.g. www.clothing.mysite.com

A cgi-bin folder was automatically created in the directory for clothing.mysite.com.  Do I need it?  I&#39;m only using the subdomain to install wordpress on it.  I don&#39;t really understand what the cgi-bin folder is for and I&#39;m happy to leave it if it doesn&#39;t harm anything.  Any thoughts?  

Should I delete the cgi-bin folder in a subdomain I just created?

I&#39;ve been unable to find a workable solution to this problem, despite several similar questions here and elsewhere. It seems likely that this question hasn&#39;t been answered for Rails 3, so here goes:

I have an application that currently allows users to create their own subdomain that contains their instance of the application. While in Rails 2 you were best served using the subdomain-fu gem, in version 3 it&#39;s dramatically simpler, as per the Railscast -- http://railscasts.com/episodes/221-subdomains-in-rails-3.

That&#39;s good stuff, but I also want to provide the option for users to associate their own domain name with their account. So while they might have http://userx.mydomain.com, I&#39;d like them to choose to have http://userx.com associated as well.

I found a few references to doing this in Rails 2, but those techniques don&#39;t appear to work anymore (particularly this one: https://feefighters.com/blog/hosting-multiple-domains-from-a-single-rails-app/). 

Can anyone recommend a way to use routes to accept an arbitrary domain and pass it along to a controller so I can show the appropriate content?

**Update**: I&#39;ve gotten most of an answer now, thanks to Leonid&#39;s timely response, and a fresh look at the code. It ultimately required an addition to the existing Subdomain code that I was using (from the Railscast solution) and then adding a bit to routes.rb. I&#39;m not all the way there yet but I want to post what I have so far.

In lib/subdomain.rb:


    class Subdomain
      def self.matches?(request)
        request.subdomain.present? &amp;&amp; request.subdomain != &quot;www&quot;
      end
    end

    class Domain
      def self.matches?(request)
        request.domain.present? &amp;&amp; request.domain != &quot;mydomain.com&quot;
      end
    end

I&#39;ve added the second class in imitation of the first, which is known working. I simply add a condition that ensures that the incoming domain is not the one for which I&#39;m hosting the main site.

This class is used in routes.rb:

    require &#39;subdomain&#39;
    constraints(Domain) do
      match &#39;/&#39; =&gt; &#39;blogs#show&#39;
    end
  
    constraints(Subdomain) do
      match &#39;/&#39; =&gt; &#39;blogs#show&#39;
    end

Here, I&#39;m prepending the existing subdomain code (again, it&#39;s working fine) with a stanza to check for the Domain. If this server responds to that domain and it&#39;s not the one under which the main site operates, forward to the specified controller.

And while that appears to be working, I don&#39;t quite have the whole thing working yet, but I think this particular problem has been solved.

Rails routing to handle multiple domains on single application

Is it possible to use .htaccess to rewrite a sub domain to a directory?

Example:


- http://sub.domain.com/ 

shows the content of 

- http://domain.com/subdomains/sub/

.htaccess rewrite subdomain to directory

I have an odd situation where I want to have the URLs `app1.example.com`, `example.com` and `*.example.com`  all using a different virtual host.  This is what I have (excluding `example.com` because it just makes it messier).

    &lt;VirtualHost *&gt;
      ServerName app1.example.com
      ServerAlias app1.example.com
    
      DocumentRoot = /var/www/app1
      # Other configuration for this app here
    
    &lt;/VirtualHost&gt;
    
    &lt;VirtualHost *&gt;
      ServerName wildcard.example.com
      ServerAlias *.example.com
    
      DocumentRoot = /var/www/wildcard
      # other configuration for this app here
    
    &lt;/VirtualHost&gt;

The problem is that they conflict.  Whichever one is listed first wins out. How can I host both a wildcard virtualhost and a specific one?

Note: I&#39;m not just changing `DocumentRoot` in the config, so using `mod_rewrite` to change the DocumentRoot variable does not fix it.


Virtualhost For Wildcard Subdomain and Static Subdomain

I have nginx acting as a reverse proxy to apache. I now need to add a new subdomain
that will serve files from another directory, but at the same time I want all location and proxy_pass directives that I have for the default host to apply to the subdomain also.

I know that if I copy the rules from the default host to the new subdomain it will work, but is there a way for the subdomain to inherit the rules?
Below is a sample configuration

    server {
        listen       80;
        server_name  www.somesite.com;
        access_log  logs/access.log;
        error_log  logs/error.log error;
    
    
       location /mvc {
          proxy_pass  http://localhost:8080/mvc;
       }
    
    
       location /assets {
          alias   /var/www/html/assets;
          expires     max;
       }
    
       ... a lot more locations
    }
    
    server {
        listen       80;
        server_name  subdomain.somesite.com;
    
        location / {
                    root   /var/www/some_dir;
                    index  index.html index.htm;
            }
    }

Thanks

Nginx subdomain configuration

Amazon.com just announced that one can host static web sites in a S3 bucket. I went to their setup page at http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?WebsiteHosting.html and created a bucket for my static web site, and it worked fine. I have an URL of the form http://[my bucket name].s3-website-us-east-1.amazonaws.com/. 

However, I would like to point a subdomain that I own (e.g. static.mydomain.com) to my static web site at Amazon S3. Has anybody figured out how to do that?

I appreciate any help you can give me.  

Amazon S3: Static Web Sites: Custom Domain or Subdomain

I want to have one user page and multiple project pages hosted by [GitHub Pages](http://help.github.com/pages) but available under **ONE** custom domain (with subdomains for each GitHub Pages repository, of course). So my goals are as follows:

* One user page (&lt;http://florianwolters.github.com&gt;) available under &lt;http://blog.florianwolters.de&gt;, &lt;http://www.florianwolters.de&gt; and &lt;http://florianwolters.de&gt;.
* As many project pages as I wish (e.g. &lt;http://florianwolters.github.com/pear&gt; available under &lt;http://pear.florianwolters.de&gt;.

As of my current understanding, GitHub Pages do only allow **ONE** CNAME resource record for a page (both user pages and project pages) defined in the `CNAME` file in the root of a Git repository.
I already tried out many things (playing around with DNS records and header redirects at my domain provider [EUserv](http://euserv.com), but I can only access my GitHub user pages under one URL (&lt;http://blog.florianwolters.de&gt;). I am aware that DNS changes can take up until two days.

Can somebody explain to me, how I can achieve the goals described above? I can not believe that this is not possible but I am also no expert for DNS, etc.

If the above is not possible: What is your suggested workaround? I do want to access all my GitHub pages under one domain (and the subdomains of that domain).

# Resources

* http://help.github.com/pages/
* https://stackoverflow.com/questions/9082499/custom-domain-for-github-project-pages
* https://groups.google.com/forum/?fromgroups#!topic/github/AaAuoDK44Ag
* https://github.com/blog/315-cname-support-for-github-pages
* http://code.lancepollard.com/custom-domain-github-pages

Multiple GitHub Pages and custom domains via DNS

HTML5&#39;s localStorage databases are usually size-limited — standard sizes are 5 or 10 MB per domain. Can these limits be circumvented by subdomains (e.g. example.com, hack1.example.com and hack2.example.com all have their own 5 MB databases)? And is there anything in the standard that specifies whether parent domains can access their children&#39;s databases? I can&#39;t find anything, and I can see arguments for doing it either way, but it seems like there has to be some standard model.

HTML5 localStorage size limit for subdomains

I have a website sitting on an IIS 7 server:
**WWW.example.COM**

I would like to create several sub domains that looks like
**SUBDOMAIN1.example.COM**

I created an IIS website and I set the bindings to be
http, port 80, the ip address of my server, and SUBDOMAIN1.example.COM and the physical path to a folder under **example.COM**

I restarted my website and clicked on browse, the browser than opened with the address:
http://SUBDOMAIN1.example.COM

But the website doesn&#39;t show up.

Do I have to do something with the DNS?

How to set up subdomains on IIS 7

What characters are you allowed to use in a subdomain?

Example: for `someSub.example.com` the `someSub` portion. 

I know you can use letters, numbers, and hyphens, but what about other characters? Can `_` (underscore) be used? 

What are the allowed characters in a subdomain?

I&#39;m new to Nginx and I&#39;m trying to get subdomains working.

What I would like to do is take my domain (let&#39;s call it `example.com`) and add:

- `sub1.example.com`,
- `sub2.example.com`, and also have
- `www.example.com` available.

I know how to do this with Apache, but Nginx is being a real head scratcher.

I&#39;m running Debian 6.

My current /etc/nginx/sites-enabled/example.com:

    server {
        server_name www.example.com example.com;
        access_log /srv/www/www.example.com/logs/access.log;
        error_log /srv/www/www.example.com/logs/error.log;
        root /srv/www/www.example.com/public_html;
    
        location / {
            index  index.html index.htm;
        }
    
        location ~ \.php$ {
            include /etc/nginx/fastcgi_params;
            fastcgi_pass 127.0.0.1:9000;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME /srv/www/www.example.com/public_html$fastcgi_script_name;
        }
    }

It is working to serve example.com and www.example.com. 

I have tried to add a second server block in the same file like:

    server {
            server_name www.example.com example.com;
            access_log /srv/www/www.example.com/logs/access.log;
            error_log /srv/www/www.example.com/logs/error.log;
            root /srv/www/www.example.com/public_html;
        
        	server {
                server_name sub1.example.com;
                access_log /srv/www/example.com/logs/sub1-access.log;
                error_log /srv/www/example.com/logs/sub1-error.log;
                root /srv/www/example.com/sub1;
        }
            location / {
                index  index.html index.htm;
            }
        
            location ~ \.php$ {
                include /etc/nginx/fastcgi_params;
                fastcgi_pass 127.0.0.1:9000;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME /srv/www/www.example.com/public_html$fastcgi_script_name;
            }
    }

No luck. Any ideas? I&#39;d super appreciate any feedback.


nginx - two subdomain configuration

Some people are saying use an A record and others a CNAME for a catch all subdomain.

Which should I use and why?

*.mydomain.com - A record or CNAME?

**Updated question to make it more clear**

I understand that you can set the domain of your session_store to share sessions between subdomains like this: `Rails.application.config.session_store :cookie_store, :key =&gt; &#39;_my_key&#39;, :domain =&gt; &quot;mydomain.com&quot;`

in Rails 3, what does the setting `:domain =&gt; :all` do? It can&#39;t let you share sessions across top-level domains, cookies can&#39;t do that.  The documentation says it assumes one top level domain.  So what happens if multiple domains access your app?

In my app, my users can create personal subdomains of one main domain, but then can also access that subdomain via their own custom domain.

What is the correct session_store domain setting so that I can:
a) share sessions across all domains of my primary domain, eg &quot;mydomain.com&quot;
b) users who access their personal subdomain eg &quot;user1.mydomain.com&quot; via a CNAME custom url like &quot;some.otherdomain.com&quot; can still create separate sessions.

Thanks

What does Rails 3 session_store domain :all really do?

I am attempting to share data across subdomains using Safari. I would like to use an HTML5 database (specifically _localStorage_ as my data is nothing but key-value pairs). However, it seems as though data stored to __domain.com__ can not be accessed from __sub.domain.com__ (or vice versa). Is there any way to share a single database in this situation?

Can HTML5 databases and localStorage be shared across subdomains?

I am used to working on httpd ( Apache ) which provides a way to configure subdomains which is mapped to a directory.
How can I do the same thing in Connect.js/Express.js ? I see that the only thing that I have is routes which I am not sure how I can use to configure sub domains. I have subdomains like m.mysite.com, sync.mysite.com

Can someone help ?

How can I configure multiple sub domains in Express.js or Connect.js

I am using rSpec for testing my application.  In my application controller I have a method like so:

    def set_current_account
      @current_account ||= Account.find_by_subdomain(request.subdomains.first)
    end

Is it possible to set the request.subdomain in my spec?  Maybe in the before block?  I am new to rSpec so any advice on this would be great thanks.

Eef



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