I am trying to consume a REST API from SendGrid and the endpoint is https://api.sendgrid.com/v3/mail/send. I have done a test and it worked. This API method is then used in a Server Action called "SendConnectEmail", which in turn is consumed from another module.

This API method ("PostSend") consist of the following inputs:
- Request (JSON Data Structure as keyed in to the test)
- ContentType (default to "application/json")
- Authorization (contains the Authorization token string)

The Server Action ("SendConnectEmail") consist of 2 inputs:
- Email
- Message
and a local variable "Data" with the Data Type being the same as that of the Request input in the API method.

The Server Action "Assign" the 2 inputs into "Data" and then calls "PostSend" and passed "Data" into the "Request" parameter.

However, when the request is sent, I received a 400 Bad Request error. I have checked the logs and realized that the body sent was empty.

POST https://api.sendgrid.com/v3/mail/send HTTP/1.1
User-Agent: OutSystemsPlatform
Content-Type: application/json; charset=UTF-8
Authorization: [Token string removed]
Host: api.sendgrid.com
Content-Length: 2

{}

HTTP/1.1 400 Bad Request
Connection: keep-alive
Access-Control-Allow-Origin: https://sendgrid.api-docs.io
Access-Control-Allow-Methods: POST
Access-Control-Allow-Headers: Authorization, Content-Type, On-behalf-of, x-sg-elas-acl
Access-Control-Max-Age: 600
X-No-CORS-Reason: https://sendgrid.com/docs/Classroom/Basics/API/cors.html
Content-Length: 980
Content-Type: application/json
Date: Sun, 27 Dec 2020 17:26:02 GMT
Server: nginx

I have tried debugging and inspected the assigning of data to "Data" local variable in "SendConnectEmail" Server Action and it seemed fine as well. When I stepped into "PostSend", in "OnBeforeRequest" callback, I saw that the "RequestText" (which I assume is supposed to be the data) is actually "{}"

I believe that I have followed the standard steps into consuming an API. I have consumed another API and it works but the difference that the one that worked was a GET instead of a POST.