How to Develop Web Service Applications in an HTTP Web Server

This section provides an overview of web page creation and customization. It explains how to develop stored procedures for your HTTP web server. It assumes that you have knowledge of starting SAP Sybase IQ HTTP web servers and creating web services that call stored procedures.

For detailed examples of web service applications, see the %ALLUSERSPROFILE%\SybaseIQ\samples\SQLAnywhere\HTTP directory.

• How to Customize Web Pages
  You must first evaluate the format of the web service invoked by the HTTP web server to customize your web pages. For example, web pages are formatted in HTML when the web service specifies the HTML type.
• How to Access Client-Supplied HTTP Variables and Headers
  Variables and headers in an HTTP client request can be accessed using one of the following approaches:
• How to Access Client-Supplied SOAP Request Headers
  Headers in SOAP requests can be obtained using a combination of the NEXT_SOAP_HEADER and SOAP_HEADER functions.
• HTTP Session Management on an HTTP Server
  A web application can support sessions in various ways. Hidden fields within HTML forms can be used to preserve client/server data across multiple requests. Alternatively, Web 2.0 techniques, such as an AJAX enabled client-side JavaScript, can make asynchronous HTTP requests based on client state. SAP Sybase IQ offers the additional capability of preserving a database connection for exclusive use of sessioned HTTP requests.
• Character Set Conversion Considerations
  Character-set conversion is performed automatically on outgoing result sets of text types by default. Result sets of other types, such as binary objects, are not affected. The character set of the request is converted to the HTTP web server character set, and the result set is converted to the client application character set. The server uses the first suitable character set listed in the request when multiple sets are listed.
• Cross Site Scripting Considerations
  When developing your web application, you should ensure that it is not vulnerable to cross-site scripting (XSS). This type of vulnerability occurs when an attacker attempts to inject a script into your web page.
• Web Services System Procedures
  The following system procedures are for use with web services:
• Web Services Functions
  Web service functions assist the handling of HTTP and SOAP requests within web services.
• Web Services Connection Properties
  Web service connection properties can be database properties that are accessible using the CONNECTION_PROPERTY function.
• Web Services Options
  Web service options control various aspects of HTTP server behavior.