Call an External API in SAP ABAP Environment

You will now create a destination in the ABAP Environment. This must be created at subaccount (not Space) level.

1. In the SAP Cloud Platform cockpit of your Cloud Foundry subaccount, navigate to your subaccount.

1. Choose Destinations, then choose New Destinations.

   

2. Enter the following values and choose Save:

   Field Name	Value
   Name	e.g. Z_STREETMAP_XXX as here
   Type	HTTP
   Description	Can be anything, here Streetmap
   URL	https://www.openstreetmap.org/#map=18/49.29271/8.64401 (In your browser, this would display Walldorf, Germany)
   Proxy Type	Internet
   Authentication	NoAuthentication

   

3. Choose Check Connection. You should get the following response.

1. In ABAP Development Tools (ADT), select the ABAP Cloud Project and choose New > ABAP Package.

2. Enter the following and choose Next:

   • Name = Z_EXTERNAL_API_XXX
   • Description = Call external API
   • Package type = Development
   

3. Choose Create new transport request, enter a description, such as “External API”, then choose Finish.

   

Now, you will create an ABAP class that will call your destination, and which you can run in the console.

1. In the ABAP Development Tools (ADT), in the Package Explorer, select your package and choose New > ABAP Class from the context menu.

   

2. Enter a name and description for your class and choose Next. Remember to change XXX to your group number.

   

3. Choose or create a transport request, then choose Finish.

   

The class is displayed in a new editor.

Add the following interfaces statement to the public section:

PUBLIC SECTION.
  INTERFACES if_oo_adt_classrun.
PRIVATE SECTION.

This enables you to run the class in the console.

To be able to access the external service, you must:
- maintain a cloud destination for the remote system
- create an HTTP client
- send an HTTP request
- output the response in the ABAP console
- wrap the code in an exception

Copy the following code. Replace the xxx of i_name with your group number:

METHOD if_oo_adt_classrun~main.
    TRY.
        DATA(lo_destination) = cl_http_destination_provider=>create_by_cloud_destination(
          i_name                  = 'Z_STREETMAP_XXX'
          i_authn_mode = if_a4c_cp_service=>service_specific ).

        DATA(lo_http_client) = cl_web_http_client_manager=>create_by_http_destination( i_destination = lo_destination ).
        DATA(lo_request) = lo_http_client->get_http_request( ).

        DATA(lo_response) = lo_http_client->execute( i_method = if_web_http_client=>get ).
          out->write( lo_response->get_text( ) ).

      CATCH cx_root INTO DATA(lx_exception).
        out->write( lx_exception->get_text( ) ).
    ENDTRY.
  ENDMETHOD.

1. Check your syntax (Ctrl+F2).
2. Save (Ctrl+S) and activate (Ctrl+F3) your class.

Run your class in the console (F9).

The output should look something like this:
.