Gateway – OData Post using Postman

Hello,

In this blog i’m gonna demonstrate how to use Postman to execute Post calls to a SAP Gateway server.

First, download Postman from here: https://www.getpostman.com/downloads/

Then, create the Z table below in your backend(assuming it’s a Hub scenario) server:

After that, create both RFC enabled Functional Modules:

function zdemo_gw_post.
*"----------------------------------------------------------------------
*"*"Local Interface:
*"  IMPORTING
*"     VALUE(IM_POST) TYPE  ZPOST1 OPTIONAL
*"----------------------------------------------------------------------
  "Just get it in there...
  modify zpost1 from im_post.
  commit work.
endfunction.

function zdemo_gw_post_read.
*"----------------------------------------------------------------------
*"*"Local Interface:
*"  IMPORTING
*"     VALUE(IM_FIELD1) TYPE  CHAR10 OPTIONAL
*"  EXPORTING
*"     VALUE(EX_POST) TYPE  ZPOST1
*"----------------------------------------------------------------------
  select single *
    from zpost1
    into ex_post
    where field1 = im_field1.
endfunction.

Now setup your ZDEMO_POST Gateway project (SEGW) like this:

Your Object Entity (ref from the Z table) with same Key field:

Create implementation:

Read implementation:

Setup your Service to your backend Alias:

After that you’re all set on the Gateway/ABAP side.

Now let’s open Postman:

Create a Request (saving in a Collection, to group calls):

Before you execute a POST call, you need to have a csrf token (you can find more info about it here: https://help.sap.com/saphelp_gateway20sp12/helpdata/en/e6/cae27d5e8d4996add4067280c8714e/frameset.htm

To get it, you need to execute a GET call fetching the token, so let’s do it:

Execute a GET call (please change the SERVER:PORT to your gateway’s server and port ?), you could just get the metadata with the following URL:  SERVER:PORT/sap/opu/odata/sap/ZDEMO_POST_SRV/$metadata

In the Authorization tab, select Basic Auth and enter your Gateways user/password:

Hit Send, and the metadata returns with success:

So it’s communicating ?, now to get the Token, in the Headers Tab, add a entry with x-csrf-token = Fetch, like below:

After executing the service, note that the token gets returned in the Headers Tab.

Now we’re all set to execute the POST call, so we change it like below:

SERVER:PORT/sap/opu/odata/sap/ZDEMO_POST_SRV/ObjectSet

Change the Token to the value returned:

In the Body section, insert this XML (change to the values that you want to be inserted in each XML Field):

<?xml version="1.0" encoding="utf-8"?>
<entry xml:base="/sap/opu/odata/sap/ZDEMO_POST_SRV/" xmlns="http://www.w3.org/2005/Atom" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices">
 <title type="text">ObjectSet</title>
 <updated>2019-07-18T17:50:32Z</updated>
 <category term="ZDEMO_POST_SRV.Object" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme"/>
 <link href="ObjectSet" rel="self" title="Object"/>
 <content type="application/xml">
  <m:properties>
   <d:Field1>WIKI</d:Field1>
   <d:Field2>FIELD2</d:Field2>
   <d:Field3>FIELD3</d:Field3>
  </m:properties>
 </content>
</entry>

Send, if everything is correct, 201 status is returned:

The data inserted in the Z table:

Enjoy. ???

Regards.