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I recently faced some issues while trying to update/create entities with JSON on Gateway. Mainly this was due to my lack of knowledge of the POST and PUT request format. In this blog I will describe how it worked for me for both single as well as batch update/create.

 

The easiest way to start with, is to make a GET call on the same collection in case of POST or on the same entity for a PUT. One more reason to make this call is to get the x-csrf-token and the sap-XSRF_GIQ_100 cookie (depends on which GW is being used) which will be required for the POST or PUT calls later.

 

The cookie was required to be added as a header because I was accessing the GW from a different domain (different location) and thus the browser was not sending the cookie back with the subsequent requests automatically.

 

GET Request

 

Let's look at the Get call, the related headers and the response below

 

URL

 

http://ldcigiq.wdf.sap.corp:50015/sap/opu/odata/IWFND/RMTSAMPLEFLIGHT/TravelagencyCollection?$top=1&$format=json

 

Headers

 

Name:x-csrf-token Value:fetch

 

Response

 

{"d":{"results":[{"__metadata":{"id":"http://ldcigiq.wdf.sap.corp:50015/sap/opu/odata/IWFND/RMTSAMPLEFLIGHT/TravelagencyCollection('00000001')","uri":"http://ldcigiq.wdf.sap.corp:50015/sap/opu/odata/IWFND/RMTSAMPLEFLIGHT/TravelagencyCollection('00000001')","type":"RMTSAMPLEFLIGHT.Travelagency"},"agencynum":"00000001","NAME":"DEBU","STREET":"","POSTBOX":"","POSTCODE":"","CITY":"","COUNTRY":"","REGION":"","TELEPHONE":"","URL":"","LANGU":"","CURRENCY":"","mimeType":"text/html"}]}}

 

Now once we have an entity, we can modify it to be used for the subsequent PUT and POST requests described below.

 

PUT Request

 

URL

 

http://ldcigiq.wdf.sap.corp:50015/sap/opu/odata/IWFND/RMTSAMPLEFLIGHT/TravelagencyCollection('00000001')

 

Headers

 

Name:Content-Type Value:application/json; charset=utf-8

Name:x-csrf-token    Value:vDXb3IhLuc-AHYojkfMG9A==

Name:cookie             Value:sap-XSRF_GIQ_100=vDXb3IhLu...

 

Request Body

 

{"d":{"agencynum":"00000001","NAME":"DEBU","STREET":"","POSTBOX":"","POSTCODE":"","CITY":"","COUNTRY":"","REGION":"","TELEPHONE":"","URL":"","LANGU":"","CURRENCY":"","mimeType":"text/html"}}

 

Note: The "results" and "__metadata" need to be removed to form the request body.

 

POST Request

 

URL

 

http://ldcigiq.wdf.sap.corp:50015/sap/opu/odata/IWFND/RMTSAMPLEFLIGHT/TravelagencyCollection

 

Headers

 

Name:Content-Type Value:application/json; charset=utf-8

Name:x-csrf-token    Value:vDXb3IhLuc-AHYojkfMG9A==

Name:cookie             Value:sap-XSRF_GIQ_100=vDXb3IhLu...

 

Request Body

 

{"d":{"agencynum":"00022222","NAME":"DEBU","STREET":"","POSTBOX":"","POSTCODE":"","CITY":"","COUNTRY":"","REGION":"","TELEPHONE":"","URL":"","LANGU":"","CURRENCY":"","mimeType":"text/html"}}

 

 

Batch processing

 

URL

 

http://ldcigiq.wdf.sap.corp:50015/sap/opu/odata/IWFND/RMTSAMPLEFLIGHT/$batch

 

Headers

Name:x-csrf-token    Value:wN9Ebbp1BDWprGXDtL-TXA==

Name:cookie             Value:sap-XSRF_GIQ_100=wN9Ebbp1BDWprGXDt.....

Name:Content-Type  Value:multipart/mixed; boundary=batch

 

Request Body

 

--batch
Content-Type: multipart/mixed; boundary=changeset

--changeset
Content-Type: application/http
Content-Transfer-Encoding: binary

PUT TravelagencyCollection('00055557') HTTP/1.1
Content-Type: application/json; charset=utf-8
Content-Length: 198


{"d":{"agencynum":"00055557","NAME":"汉字漢","STREET":"","POSTBOX":"","POSTCODE":"","CITY":"","COUNTRY":"","REGION":"","TELEPHONE":"","URL":"","LANGU":"","CURRENCY":"","mimeType":"text/html"}}


--changeset
Content-Type: application/http
Content-Transfer-Encoding: binary

POST TravelagencyCollection HTTP/1.1
Content-Type: application/json; charset=utf-8
Content-Length: 198

{"d":{"agencynum":"00044470","NAME":"再見","STREET":"","POSTBOX":"","POSTCODE":"","CITY":"","COUNTRY":"IND","REGION":"","TELEPHONE":"","URL":"","LANGU":"","CURRENCY":"","mimeType":"text/html"}}
--changeset--
--batch--

 

Note:

If any one of the two request fails to succeed, both fails.

The content length must be accurate or more, if it is less, then you will get an exception stating "Error while parsing an XML stream: 'unexpected end of string'"

 

Helpful links

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/40546820-3ea7-2f10-dfab-be373c0da357?QuickLink=index&overridelayout=true&55959128903935

 

Hope this helps!

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