Web services:
Its an entity that can be programmed to provide a particular functionality to any number of web application over the internet. It does have not any user interface. It has been fairly difficult to call remote methods on one web server from another web server. However, by using web services developers can create components whose methods can be accessed by application that reside on another web server. A common server which used to exposing a web service and through that lot of applications can consume a web service. Because that is done using standard protocols such as XML and SOAP. Here the important one i.e. , the extension of the web service file is .asmx.
Major features:
• They can be implemented on vary platform.
• It’s never affected by firewall.
• It can be accessed by any application regardless of the software and hardware platform on which the applications is running, because it complies with common industry standard such as SOAP and web service descriptive languages.
Parts of Web Services:
SOAP: Simple Object Access Protocol
• It’s a platform independent
• It’s a communication protocol.
• Format for sending messages.
• Based on XML Files
• Design for communication via internet.
Its messages are transmitted across the web applications using the HTTP. The HTTP is a standard protocol, which support by almost every operating system and network configuration.
WSDL: Web Service Description Language
WSDL allow consumer to know about the web service before interacting with them. It’s an XML file.
How to locating a web service?
DISCO: Discovery – It is a standard that create a list of web service in a file called DISCO file. A organization can publish it own DISCO file on the server, so that clients can access this file to determine what all the web services are available.
UDDI: Universal Description, Discovery and Integration – It’s a standardize directory where different web services offered by different organization are publish. This particular directories has own advantages over the DISCO files, as client can search the required web services in directory.
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