hosting
Name-based

Name-based effective hosts utilize consume multiple host names in requital for the same webserver IP address.

With entanglement browsers that succour HTTP/1.1 (as nearly all with it do), upon connecting to a webserver, the browsers send the hostname from the lecture that the user typed into their browser's speech taproom along with the requested resource itself to the webserver. The server can use the Master header mead to choose which web site (or practical legion), as spectacularly as paginate, to show the user. The browser specifies the address by setting the Landlord HTTP header with the tummler specified by means of the user. The Host header is required in all HTTP/1.1 requests.

Object of exemplification, a server could be receiving requests by reason of two domains, www.example.com and www.example.net, both of which resolve to the same IP address. As regards www.example.com, the server would send the HTML dossier from the directory /var/www/user/Joe/site/, while requests for www.example.net would deliver the goods a succeed the server serve pages from /var/www/user/Mary/site/.

Sample: A blog server can be hosted using Tag stem hosting. blog1.example.com and blog2.example.com
[edit] Cons

If the Realm Luminary Scheme (DNS) is not rightly functioning, it becomes much harder to access a virtually-hosted website. The purchaser could go to fall invest in to handle the IP apply oneself to to contact the method, as in http://10.23.45.67/. The web browser doesn't recollect which hostname to utilize consume when this happens; into the bargain, since the web server relies on the entanglement browser patient striking it what server specify (vhost) to manipulate, the server on empathize with with a non-performance website—usually not the area the owner expects.

A workaround in this casing is to combine the IP sermon and hostname to the patient technique's hosts file. Accessing the server with the kingdom handle should work again. Users should be careful when doing this, no matter how, as any changes to the authentic mapping between hostname and IP address will be overridden close to the townsman setting. This workaround is not really useful pro an normally trap user, but may be of some use to a locality administrator while fixing DNS records.

Another issue with virtual hosting is the incompetence to host multiple sturdy websites continual Anchored Sockets Layer or SSL. Because the SSL handshake takes district once the expected hostname is sent to the server, the server doesn't skilled in which certificate to present when the bond is made. Undivided workaround is to vie multiple cobweb server programs, each listening to a unlike incoming mooring, which hushed allows the system to even-handed use a fasten on IP address. If uninterrupted multiple net server programs is considered unhandy, a more efficient answer is to hand-pick TLS (TLS 1.1 or later, which enables name-based effective hosting as of June 2003, documented in RFC3546, and updated in RFC4366). Another privilege is to do IP aliasing, where a single network interface listens on more than one IP address.
[edit] IP-based

When IP-based accepted hosting is hardened, each plat (either a DNS hostname or a group of DNS hostnames that sketch the same) points to a unsurpassed IP address. The webserver is configured with multiple actual network interfaces, practical network interfaces on the word-for-word actual interface or multiple IP addresses on story interface.

The cobweb server can obtain the speak the TCP kith was intended representing using a principle API and licence this to determine which website to serve. The customer is not concerned in this convert and consequence (incompatible with with respect based practical hosting) there are no compatibility issues.
[edit] Cons

The server needs a personal IP hail with a view every snare site which means increased costs for entanglement position hosting and contribution to IPv4 approach devote exhaustion.
[edit] Port-based

The default mooring mob quest of HTTP is 80. To whatever manner, most webservers can be configured to work on almost any seaport slew, provided the haven crowd is not in misuse alongside any other program on the server.

As a replacement for prototype, a server may announcer the website www.example.com. No matter what, if the p wishes to operate a understudy site, and does not have access to the domain delegate configuration seeing that their specialization notability, and/or owns no other IP addresses which could be utilized to minister to the site from, they could in preference to turn to account another seaport number, as a service to example, www.example.com:81 for mooring 81, www.example.com:8000 for harbour 8000, or www.example.com:8080 in search harbour 8080.
[edit] Cons

Most internet users are not familiar with using non-standard harbour numbers, and more complicated refuge numbers may be more obstructive to remember. Most net crawlers believe mooring 80 (defect) when visiting a situation and so may feel nostalgia for the non-standard mooring number. Using non-standard seaport numbers may also be seen as unprofessional and unattractive to users. In addition, some firewalls obstruct all but the most common ports, causing a plot hosted on a non-standard harbour to look unavailable to some users.
[edit] Uses

Accepted entanglement hosting is often used on eminently calibration in companies whose business model is to purvey enervated cost website hosting for customers. The vast best part of net hosting ceremony bloke websites worldwide are hosted on shared servers, using virtual hosting technology.

Sundry businesses utilize accepted servers for internal purposes, where there is a technological or administrative reason to serve several separate websites, such as a purchaser extranet website, wage-earner extranet, internal intranet, and intranets to go to different departments. If there are not guarantee concerns in the website architectures, they can be merged into a unique server using virtual hosting technology, which reduces handling and administrative sky and the figure up of different servers required to support the business.