Hasura query action exception - docker

Question

Got a small problem (I guess). I created c# rest web API on docker swarm environment. Rest API is working properly - tested via the postman. Then I tried to compose Hasura service on the same docker swarm environment. The console is working properly also. The problem is with query action.
Code:
Action definition:
type Query {
getWeatherForecast : [WeatherForecastResonse]
}
New types definition:
type WeatherForecastResonse {
date : String
temperatureC : Int
temperature : Int
summary : String
}
Handler:
http://{api ip}:{api port}/WeatherForecast
While trying to execute query:
query MyQuery {
getWeatherForecast {
temperature
summary
date
temperatureC
}
}
All I got from response is error with json:
{
"errors": [
{
"extensions": {
"internal": {
"error": "invalid json: Error in $: not enough input",
"response": {
"status": 405,
"body": "",
"headers": [
{
"value": "Mon, 14 Jun 2021 13:54:00 GMT",
"name": "Date"
},
{
"value": "Kestrel",
"name": "Server"
},
{
"value": "0",
"name": "Content-Length"
},
{
"value": "GET",
"name": "Allow"
}
]
},
"request": {
"body": {
"session_variables": {
"x-hasura-role": "admin"
},
"input": {},
"action": {
"name": "getWeatherForecast"
}
},
"url": "http://{api ip}:{api port}/WeatherForecast",
"headers": []
}
},
"path": "$",
"code": "unexpected"
},
"message": "not a valid json response from webhook"
}
]
}
I got desired response by using postman white calling: http://{api ip}:{api port}/WeatherForecast (GET method)
Where should I improve, to finally get desired result from rest api?
P.S. hasura version: v2.0.0-alpha.4 (tried also with v1.3.3)
UPDATE:
Released a new version of web API. Inside WeatherForecastController included a new method with POST attribute. Query remained the same, but now graphql query returns what I want.
So the question is: Is it possible to call/access web api methods with GET attribute with Hasura action query?

Answer 1

From the version v2.1.0 and above we can do this using the REST Connectors.Hasura Actions RESTConnectors Methods
Go to the Actions tab on the console and create or modify an action. Scroll down to Configure REST Connectors.
In the Configure REST Connectors section, click on Add Request Options Transform
Along with this you can do a lot of other configurations.

Answer 2

No, currently it's not possible, Hasura always makes POST requests to the action handler:
When the action is executed i.e. when the query or the mutation is called, Hasura makes a POST request to the handler with the action arguments and the session variables.
Source: https://hasura.io/docs/latest/graphql/core/actions/action-handlers.html#http-handler