Call POST API from GET API

RE: Call POST API from GET API

Stefan Helzle — Wed, 05 Mar 2025 11:55:45 GMT

So, while not recommended, you can do the following:

External System -> GET -> Appian Web API -> Appian Integration (*) -> POST -> Appian Web API

* Why not recommended? When you configure a POST integration you set the "Usage" parameter. When set to "Queries Data", you can call that integration from any Appian interface or Smart Service. When set to "Modifies Data", you can use it only inside a saveInto, a Smart Service, or inside a POST Web API. So you have to falsely configure it to "Queries Data" even if it starts a process that updates data in the system.

RE: Call POST API from GET API

Sadia_Rashid — Wed, 05 Mar 2025 11:45:31 GMT

But the issue is even if i create integration for it, how we will use this integration outside appian? the use case here is that I want to trigger a process model that resides in appian from outside appian and as a result I want the response. Through Integration Its not achievable as its an appian object I cannot use it outside appian. but using the GET webapi and this httppost() function I am able to achieve this. what other option do I have apart from this?

RE: Call POST API from GET API

Stefan Helzle — Thu, 27 Feb 2025 14:42:08 GMT

I know that, but this is not a standard function in Appian and not a good way to do it.

Use integrations for such operations.

RE: Call POST API from GET API

Sadia_Rashid — Thu, 27 Feb 2025 13:44:26 GMT

Its a WebService Expresion : httppost

and I am able to achieve what I required. I passed multiple parameters to my post request like this:

local!postRequest: httppost(
endpoint: concat(
cons!SITE_URL,
cons!ENDPOINT
)
& "KeyInstn=" & local!KeyInstn
& "&FormId=" & local!FormId

RE: Call POST API from GET API

Stefan Helzle — Thu, 27 Feb 2025 13:37:48 GMT

I did not find this plugin. Is this a recent one?

RE: Call POST API from GET API

Sadia_Rashid — Thu, 27 Feb 2025 13:21:40 GMT

It is one of the functions available under Web and XML Extensions shared component - httppost

RE: Call POST API from GET API

Stefan Helzle — Thu, 27 Feb 2025 13:07:14 GMT

Is this from the plugin "Send HTTP Request"? If yes, please delete it. It is deprecated and not been updated in the last 6 years.

RE: Call POST API from GET API

Sadia_Rashid — Thu, 27 Feb 2025 12:58:53 GMT

I have done it through httppost request. like this:

local!postRequest: httppost(
endpoint: concat(
cons!SITE_URL,
cons!ENDPOINT
) & "Key=" & local!Key
headerNames: {cons!API_AUTHORIZATION_KEY},
headerValues:{cons!API_AUTHORIZATION_KEY_HEADER_VALUE}

),

and its working fine. Can you now tell how can I pass two query params here? Its working fine with only one param here but if I pass a second param aslo, it throws an error. I want to do something like this:

endpoint: concat(
cons!SITE_URL,
cons!ENDPOINT
) & "Key=" & local!Key
& "FormId=" & local!FormId,

RE: Call POST API from GET API

Sadia_Rashid — Thu, 27 Feb 2025 12:53:01 GMT

I have done it through httppost request. like this:

local!postRequest: httppost(
endpoint: concat(
cons!SITE_URL,
cons!ENDPOINT
) & "Key=" & ri!Key
headerNames: {cons!API_AUTHORIZATION_KEY},
headerValues:{cons!API_AUTHORIZATION_KEY_HEADER_VALUE}

),

RE: Call POST API from GET API

Stefan Helzle — Thu, 20 Feb 2025 08:50:14 GMT

This is me, guessing: You want to put a button on an Appian interface to start a process and display the interface from that process to the user?

If this is the case, do you have any specific reason to not use a record action field or a start process link?

RE: Call POST API from GET API

Sadia_Rashid — Thu, 20 Feb 2025 08:36:38 GMT

yes that is exactly what I am trying to do. I have created a POST api to start a process and I am getting the url to form in its response.

Now I want to utilize response of this POST API "the url to form", in my another GET API to make it user friendly, and that's my question how can I use the response of POST API in my GET API.

RE: Call POST API from GET API

Stefan Helzle — Thu, 20 Feb 2025 08:31:18 GMT

Starting a process cannot be done using a GET. You will need some kind of client side logic or code that first makes a POST to Appian, and then somehow navigates the user to the returned URL.

RE: Call POST API from GET API

Sadia_Rashid — Thu, 20 Feb 2025 08:21:52 GMT

Actually I am trying to execute a startprocess from outside appian for which I want to give just a url to client so that when they hit the url the startprocess should occur and a resulting user input task form inside that process model should get displayed to them.

To trigger the process model I have written a POST Webapi but to create a URL I need to have getAPI thats why I am trying to integrate these two to generate a url for client.

RE: Call POST API from GET API

Stefan Helzle — Thu, 20 Feb 2025 08:17:58 GMT

I am not sure I fully understand what you are trying to achieve, but find some examples in the documentation here: docs.appian.com/.../Designing_Web_APIs.html