Response is null when calling a POST API from Expression Rule that uses an OpenAPI Connected System to get a Token

RE: Response is null when calling a POST API from Expression Rule that uses an OpenAPI Connected System to get a Token

pavana162 — Tue, 25 Oct 2022 12:36:58 GMT

insurityapp0001, Sorry for jumping into the conversation 6 months late. Im adding a response here because I had a similar issue but I cannot be sure the root cause is the same. Do you have mixed casing in the Header name? eg "X-AdobeSign-ClientId" can you try either making the Header name all lower case if that is possible, Else in the WebAPI code, update the Header name you expect to a lower case eg. "x-adobesign-clientid" instead of "X-AdobeSign-ClientId" (which would be the Header name used from Postman/ external client) . It is possible that your issue might have been addressed after a version upgrade by Appian. Please do let us know in either case about how your issue was resolved if it has been.

Thanks,

Pavan

RE: Response is null when calling a POST API from Expression Rule that uses an OpenAPI Connected System to get a Token

Stefan Helzle — Mon, 09 May 2022 07:46:30 GMT

Did you configure the token fetching integration to "Queries Data" for "Usage"?

RE: Response is null when calling a POST API from Expression Rule that uses an OpenAPI Connected System to get a Token

Anthony Shepherd — Mon, 09 May 2022 07:28:58 GMT

I suspect that the Integration Object requires a query parameter to be successful otherwise it might just be the expression itself is wrong.

Either way you need to create a rule input in your integration object and reference it in your query parameter. (I added a screenshot of this on your other post)

In your expression you don't need it so complex, the code below should work perfectly.

fromJson(
rule!CO_CXP_POST_UserSession_OpenAPI(
isActive: 1 /* create a rule input for this parameter */
).result.body
)