URL of a Web Dynpro Application 
The URL of a Web Dynpro application is automatically generated by the system. You find the URL of your application in the Web Dynpro Explorer on the Properties tab.
The URL of a Web Dynpro application has the following structure (default configuration):
<schema>://<host>.<domain>.<extension>:<port>/sap/bc/webdynpro/<namespace>/<application name>
<schema> stands for the URL schema (also known as protocol), which usually is the protocol http or https (if configured). host is the name of the application server that should execute the application. domain with the extension comprises several hosts under a common name and can either be an individual host or a network. The port number can be omitted if the default port 80 (http) or 443 (https) is used.
The path
/sap/bc/webdynpro is the
path specification in the Internet service tree (see also 
Creating and
Configuring ICF Service).
For SAP Web
Application Server, the default port number is 1080 (http) or 1443 (https). The
namespace is the
namespace ID of the Web application. SAP applications are delivered in the sap namespace. If you create your Web application in a separate
namespace, it must be used in the URL (see also Setting Up a Namespace
for Development). The
application name is the
name of the Web application as defined in the development environment based on
the Web Dynpro component if the name of the application does not use a
namespace prefix. In this case,
the namespace sap is used. If the application name contains a namespace
prefix, the application name is the name of the application without the
namespace prefix, and this namespace prefix is used as namespace.
http://ld0020.wdf.sap.corp:50021/sap/bc/webdynpro/sap/wdp_flight
See also:
Calling a Web Dynpro Application Using Parameters