Building REST services with
WebHandlers on PASOE

Course Details

The course starts with an overview and what a REST service is, together with REST’s
relationship to HTTP. What an HTTP request and response consists of is discussed,
including HTTP methods, status codes and key headers. In addition, a common design
approach and basic style guide for REST services is outlined before moving on to
implementing REST services in OpenEdge, which will include the following topics:

• options for creating REST services with OpenEdge
• REST services with the DataObjectHandler (Business Entities)
• JSON Filter Pattern
• how to return validation errors from a Business Entity
• custom methods in Business Entities
• custom HTTP responses from Business Entities
• support for JSDOs
• use of custom WebHandlers
• evaluating HTTP requests (paths, path and query parameters)
• creating and sending HTTP responses (text & binary data)
• uploading single or multiple files
• detecting and handling invalid requests
• options for versioning REST services
• WebHandler deployment
The course is taught on an up-to-date version of OpenEdge, with an emphasis on
hands-on exercises carried out by the attendees. Attendees will be provided with
course and exercise notes and final solutions to the exercises.


This course is for OpenEdge® developers who will be creating REST services on PASOE
(Progress Application Server for OpenEdge) using both the built-in and custom WebHandlers.

What will you learn:

After taking this course, you should:

• know what makes a service ‘RESTful’
• be introduced to a common URI design approach
• understand HTTP requests & responses
• be able to use the built-in DataObjectHandler (i.e. create Business Entities)
• how to customise Business Entity HTTP responses
• be able to create custom WebHandlers for sending and receiving text/JSON and binary
data (including file upload & download)
• know how to detect problem requests and respond with appropriate HTTP status codes
• have options for versioning REST services
• be aware of WebHandler differences on development vs. production PASOE
• gain an insight to REST API testing with Postman


23 September 2021 | Virtual French

2 November 2021 | Virtual English APJ

29 November 2021 | Virtual English

Contact education@progress for more dates and locations

Training Prerequisites

Attendees should:

• have a working knowledge of Progress Developer Studio for OpenEdge
• awareness of Progress Application Server for OpenEdge (PASOE)
• be familiar with ProDataSets, including an awareness of ‘before-tables’
• know the basics of structured error handling (throw/catch)
• have elementary knowledge of the OOABL (including classes, methods, method
overriding, properties, inheritance & enums)

An Investment in Knowledge Pays the Best Interest

Training courses are available for all of our different products, from OpenEdge to Sitefinity, and also span a wide variety of different job titles and skill levels. Help your team stay up to date with technology trends and get the most out of your Progress technology investment.

Request More Information