Impossible to work with fetch to get data from external API?

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Question:
After many trials it seems to me that the fetch method does not work.

Product:
Wix Velo

What are you trying to achieve:
I am trying to send a request to an external API and to receive a response.

What have you already tried:
This is the code in velo:


export const testFetch = webMethod(
  Permissions.Anyone, 
  (inp) => {
    let payload = {"var1": "val1",
    "key2": inp};

    const fetch_options = {
      method: "GET",
      headers: {
        'Content-type': 'application/json'
      },
      //empty body is always sent
      body: "{\"wix\":99}" //JSON.stringify(payload)
    };

    console.log(fetch_options);


    return fetch( "https://flannel-lemon-random.glitch.me/" , 
      fetch_options
    ).then((httpResponse) => {
      if (httpResponse.ok) {
        //body is always empty here
        console.log("response: %o", httpResponse);
        return httpResponse.text;// json();
      } else {
        return Promise.reject('Fetch did not succeed');
      }
    })
    .catch((err) => console.log(err));
  }
);

This is the server side code receiving the requests

This is the curl command, that works:

curl -X GET https://flannel-lemon-random.glitch.me/ \
  -H "Content-type: text/plain" \
  -H "Accept: application/json" \
  -d "hola"

Additional information:
When wix-fetch sends a request, the body received on the external side is ALWAYS empty.
I tried GET, POST, application/json, url-encoded… does not seem to matter. :worried: