Entendiendo Web Services

Ramiro Moreno Barcia — Tue, 20 Sep 2016 10:09:37 +0000

El pasado 23 August were fulfilled 25 anniversary of the birth of the World Wide Web, whose father is Tim Berners-Lee. Software engineer at CERN, he realized the difficulty scientists have in sharing information through a common medium, the data were scattered on different computers, so to access them, I had to go computer to computer, and so he began work on the project that would become the first web known. He developed a distributed hypertext system and the three key technologies WWW: HTML language, las URLs y el Hypertext Transfer Protocol enabling transfer of information. Vinton Cerf, developer communication protocol TCP / IP, hizo el resto.

El 20 de diciembre de 1990 Tim he published the first website in history, still it retains the original content of the first web of public access, and you can access it through este enlace. related Web with your own project, where the basic features of the web describing; extremely simple page in composition, plain text, cuya navegación se realizaba a través de hipervínculos.

Evolución de la web

After 25 años, the web still evolving. Today not conceive the world without its existence. It has changed the way we relate, work, to see the world through a decentralized space, universal.

This evolution is reflected in the Web Services (web services). At birth the websites were static, extremely simple, it took some years to add items such as pictures, money, partly because the connections were very slow. Today the contents of the web pages are dynamic (different technologies: scripts, PHP, .NET, Java, Flash…), with aggregation of features that did not exist, customizing the website according to the device type, audience it is aimed, etc.

Web Services could be considered an evolution of distributed systems, a set of computers, which are physically separated interconnected, and sharing a vision been offering a single system. A Web Service can be defined as a program that is called from another program via the web using open protocols, It is a method of communication between two devices through the Web, and facilitates data sharing across a network. Web services allow different software applications developed in different programming languages, and executed on any platform, To use web services to exchange data in networks, as Internet; esta interoperabilidad entre aplicaciones se consigue gracias a la utilización de estándares abiertos.

exchanging data

Direct connections between databases and clients who need the data is not normally possible, due to security, compatibility problems, etc. There the Web Services appear to the rescue, to solve the problem, ya que hacen fácil el intercambio de datos a través de la red.

Componentes de los Web Services

La architecture de los Web Services se basa en:

Registro del servicio.
Proveedor del servicio.
Solicitante del servicio.

We distinguish several components on Web Services:

XML (eXtensible Markup Language): Un mecanismo uniforme de representación e intercambio de datos.
SOAP (Simple Object Access Protocol): Un estándar de comunicación.
UDDI (Universal Description, Discovery and Integration specification): un mecanismo para registrar y localizar una aplicación Web Service.
WSDL (Web Services Description Language): un metalenguaje estándar para describir los servicios ofrecidos.

employ HTTP as the transport protocol and most firewalls allow access through port 80, facilitando la colaboración.

Web services, un ejemplo práctico

Un object lesson Web Service would be a flight search (skyscanner, edreams…), when searching (SOAP request) the search will locate (UDDI) and will communicate with the various Web Services of airlines and will extract data (bases de datos), devolviéndonos (SOAP response) the results of the consultation legibly (XML). We can access databases of different airlines regardless of the technology to implement (PHP, JAVA…), el usuario puede obtener un resultado de la información proveniente de distintos sitios.

Ventajas de los Web Services

Certainly the Web Services provide advantage and they have great potential and acceptance for different reasons:

They are based on standards que tienen un amplio apoyo de la industria.
employ simple technologies existing and proven (HTTP, XML).
They manage interoperatividad entre sistemas que difieren en software y hardware.
Son easy to implement y They are not expensive, because existing infrastructure is used. Typically deployed on a web server, como las páginas web ordinarias.

Un Web Service es la manera más actualizada y segura de intercambio de datos entre sistemas
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Did you like this article and would like to know more about web services? Inscríbete en el curso online gratuito de Web Services, que vamos a impartir para trabajadores en activo (por cuenta ajena o autónomos) of the Comunidad Valenciana.