Struggling to create a custom action that does http post with x-www-form-urlencoded data

GPT builders Plugins / Actions builders
1

Hi !
Working on building a custom gpt that can make a call to an external api. The external api requestes the data to be submitted to it with content type as application/x-www-form-urlencoded

Here’s how my simple OpenAPI spec file (in YAML ) looks like:

openapi: 3.0.1
info:
  title: Test HTTP Post
  description: Test HTTP Post requests with form submit
  version: 1.0.0
servers:
  - url: https://kallipr-fake-petstore.free.beeceptor.com/api
    description: Example API server
paths:
  /data:
    post:
      operationId: submitFormData
      summary: Submit form data
      description: Endpoint to submit data using application/x-www-form-urlencoded content type.
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              properties:
                first_name:
                  description: First name of the user
                  type: string
                last_name:
                  description: Last name of the user
                  type: string
      responses: 
        '200':
          description: Success response
          content:
            application/json:
              schema:
                type: object
                properties:
                  message:
                    type: string
        '400':
          description: Bad Request
        '401':
          description: Unauthorized

While trying the preview - the debug http section shows that this is how it looks like

{
  "domain": "kallipr-fake-petstore.free.beeceptor.com",
  "method": "post",
  "path": "/data",
  "operation": "submitFormData",
  "operation_hash": "a81858e22c18caacec8090ab9747b404f8b5bece",
  "is_consequential": true,
  "params": {}
}

I have used this prompt:

Submit test form data with first name as Hello and last name as world

I am using vscode editor for authoring the YAML. OpenAPI extensions say this is a valid YAML and can generate correct http POST requests from inside of vscode.

What am I doing wrong in this YAML for GPT Actions not sending the body?

2

I tried to pass data to the Action using requestBody in many different ways and none worked, just passing data on query, headers or path worked to me.

3

I can could get the application/json post request body to work. Just struggling to get the application/www-form-url-encoded to work

4

I’m having this issue too. I can make the request successfully via Postman. Is www-form-url-encoded just not supported currently? The API I’m using only accepts that format for the request body schema.

5

What did you do to make it submit the data with POST via JSON? I am struggling with it up till now.

6

Hey mate, the following YAML schema will work for application/json custom action:

---
openapi: 3.2.0
info:
  title: API For a Pet Store
  description: OpenAPI spec creating new pets at a petstore
  version: v1.0.0
servers:
- url: <your url endpoint goes in here>
paths:
  "/pets":
    post:
      description: Create a new pet
      operationId: addPets
      parameters:
      - in: query
        name: api_key
        description: Authentication API Key for the request
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Pet'
            examples:
              dog:
                summary: A representation of a dog
                value:
                  name: dog
                  type: dog
                  color: brown
                  age: 5
components:
  schemas:
    Pet:
      type: object
      properties:
        name:
          type: string
        type:
          type: string
        color:
          type: string
        age:
          type: integer
7

use Put Update Data. Post create New Data en call endpoint, aplication objet JSON.

8

For my GPT, the API I’m trying to interact with only accepts www-form-urlencoded data, it seems. So that means I’m out of luck, right?

9

As of now, looks like it.
I will have to see if there’s a way to raise a support ticket with the OpenAI team.

1 Like