15. Web Application Development

Abstract

This chapter deals with the Virtuoso HTTP Server, its Dynamic Page generation and components used to configure it. The HTTP Servers features include:

Web server configuration and access control.
Multihosting, Virtual Hosting and Virtual Directories - A single Virtuoso server can map requests into multiple spaces of web pages based on the interface to which the requests come (multihosting) or on the Host HTTP/1.1 header (virtual hosting).
HTTP/1.0 and HTTP/1.1 support, keep alive connections and pipelining.
Proxying - Virtuoso can automatically redirect requests to certain resources or directories to another web server.
Authentication and security - Specific directories can be made to require authentication (basic or digest) or may be restricted to SSL only. Authentication can also be totally user defined.
SOAP - given directories can be defined as containing SOAP services, which can be accessed by SOAP clients, invoking Virtuoso stored procedures.
Dynamic content - Given paths can be executable, allowing defining VSP, and VSPX pages that generate HTML or XML using embedded Virtuoso/PL.
WebDAV - Paths can be mapped into DAV collections maintained inside the database. Virtuoso WebDav is a Unix file system-like mechanism allows specifying access rights and ownership of DAV resources.
WebDAV resources may optionally be indexed in a free text index.
A web robot allows copying external web resources into Virtuoso WebDAV.

15.1. The HTTP Server

15.1.2. HTTP Server Base Configuration

15.1.3. Virtual Directories

15.1.4. Authentication

15.1.5. Session Management

15.1.6. Writing Your Own Authentication and Session Handling

15.1.7. Cancellation of Web Requests

15.1.8. Virtuoso WebRobot API

15.1.9. HTTP Server Extensions

15.1.10. Chunked Transfer Encoding

15.1.11. Using Virtuoso Server capabilities via Apache Web Server

15.2. Web Services ACL (Access Control List)

15.2.1. General purpose ACLs

15.2.2. ACL Definition/Removal

15.2.3. Using ACL's Within Application Logic

15.2.4. Predefined ACLs

15.3. Virtuoso Server Pages (VSP)

15.3.2. VSP Markup & Basic Functions

15.3.3. Access Request Information

15.3.4. Errors in Page Procedures

15.3.5. /INLINEFILE HTTP Server Pseudo-Directory

15.3.6. Beyond Basics

15.3.7. Long HTTP Transactions

15.3.8. Using chunked encoding in HTTP 1.1

15.3.9. Making Simple Dynamic Web Pages

15.3.10. Generation of non-HTML output

15.3.11. Post VSP XSLT Transformation Mode

15.3.12. XML & XSLT Generated VSP Pages

15.4. Virtuoso Server Pages for XML (VSPX)

15.4.1. Processing Model

15.4.2. Object Model

15.4.3. Keeping Page and Session State

15.4.4. Application Code

15.4.5. A Simple Example

15.4.6. VSPX Event Handler Parameters

15.4.7. Registering a VSPX Event Callbacks

15.4.8. Commonly Used Types of Attributes of VSPX Controls

15.4.9. VSPX Controls

15.4.10. XForms rendering

15.4.11. XMLSchema for VSPX page

15.5. Deploying ASP.Net Web Applications

15.5.2. Programming Concepts

15.5.3. ASP.Net Deployment & Configuration

15.5.4. The Mono Project

15.5.5. Migrating ASP.Net Applications to Virtuoso

15.6. ASMX Web Service Hosting

15.7. Blogging & Weblogs

15.7.1. The Virtuoso Blogging Application

15.7.2. Blogger Clients Compatibility

15.7.3. Blogs Management User Interface

15.7.4. Community Blog Site

15.7.5. Blogger API

15.7.6. MetaWeblog API

15.7.7. Movable Type API

15.7.8. Atom API

15.7.9. XML-RPC Endpoint Configuration

15.7.10. Blog Hooks - Customizing the Blog Server

15.7.11. Blogger Client API

15.7.12. xmlStorageSystem API

15.7.13. User's Blog quota

15.7.14. Posting a message in to the Blog

15.7.15. Multi-author blogging

15.7.16. Posting a comments

15.7.17. Blog Post Upstreaming (bridging)

15.7.18. Weblogs API

15.7.19. Subscriptions

15.7.20. Trackback API

15.7.21. Pingback API

15.7.22. E-mail Notifications

15.7.23. Comments tracking options

15.7.24. Subscription Harmonizer API

15.7.25. Mobile Blogging (Moblog)

15.7.26. Posting a dynamic content

15.7.27. Notification Services

15.7.28. Rendering the RSS feed in WML format

15.8. Deploying PHP Applications

15.8.2. Building the Virtuoso Server With PHP Extension

15.8.3. PHP Extension Functions

15.8.4. PHP Examples

15.9. Deploying JSP Applications

15.9.2. Environment Setup & Verification

15.10. Perl Hosting

15.11. Python Hosting

15.12. Ruby Hosting

Virtuoso provides a full function web server with dynamic web page generation capability using SQL procedures embedded in HTML or XML via VSP or VSPX. Runtime hosting allows Virtuoso to generate dynamic web pages from other sources also, such as ASP.Net, PHP or JSP.

Out-of-the-box Virtuoso listens for HTTP requests on the port defined in the HTTP Server section of the Virtuoso INI file. The Visual Server Administration Interface is available at this port and can be used to further configure the web server.

Web resources can be based on the file system, reside in the database or in WebDAV or any combination of all of them. WebDAV space can be specified at the path level, by default, paths beginning with /DAV are mapped to the WebDAV root collection (directory) and all other paths are assumed to be file system based. By default / is mapped to the directory specified as ServerRoot in the HTTP Server section of the virtuoso.ini file.

Virtual Directories provide a way to make mappings from paths to other resources such as specific file system or WebDAV locations, other HTTP Servers acting as a proxy or to alter specific processing or authentication rules for a directory.

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Abstract

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