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  • 1.  Implementing webservices

    Posted Sat September 21, 2024 09:03 AM

    Hi,

    To implement webservices for IBM i are below steps, correct? if not could someone please advise correct steps?

    Implementing web services on IBM i can be done using the Integrated Web Services (IWS) server. Here's a step-by-step guide to get you started:

    ### 1. **Setting Up the IWS Server**
    1. **Start the IBM Web Administration for i Interface**:
       - Use the command `STRTCPSVR SERVER(*HTTP) HTTPSVR(*ADMIN)` to start the HTTP server.
       - Access the IBM Web Administration for i interface via a web browser.

    2. **Create an Integrated Web Services Server Instance**:
       - In the IBM Web Administration for i interface, navigate to the "Create New Server" option.
       - Select "Integrated Web Services Server" and follow the prompts to configure your server instance¹.

    ### 2. **Deploying a Web Service**
    1. **Prepare Your ILE Program**:
       - Ensure your ILE (Integrated Language Environment) program is ready to be exposed as a web service. This can be a *PGM or *SRVPGM object.

    2. **Deploy the ILE Program**:
       - Use the IBM Web Administration for i interface to deploy your ILE program as a web service.
       - Follow the steps to specify the program object and configure the web service settings¹.

    ### 3. **Consuming Web Services**
    1. **Using SQL to Consume Web Services**:
       - You can use the `HTTPGETCLOB` function to perform an HTTP GET request and retrieve the response as a CLOB (Character Large Object). Here's an example SQL script:
         ```sql
         SELECT FIRSTNAME, SURNAME, WEBSITE 
         FROM JSON_TABLE (
           SYSTOOLS.HTTPGETCLOB('https://example.com/api', NULL), 
           '$' COLUMNS (
             FIRSTNAME CHAR(50) PATH '$.firstName', 
             SURNAME CHAR(50) PATH '$.surName', 
             WEBSITE CHAR(50) PATH '$.webSite'
           )
         ) AS X;
         ```
       - This script retrieves data from a web service and parses it into a table format².

    ### 4. **Advanced Configuration**
    1. **Enable CORS and HSTS**:
       - For enhanced security, you can enable Cross-Origin Resource Sharing (CORS) and HTTP Strict Transport Security (HSTS) in the IWS server settings¹.

    2. **Logging and Monitoring**:
       - Configure logging in JSON format, HTTP access logging, and HTTP message logging to monitor your web services¹.

    Thanks.



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