400000 One of the request inputs is not valid. error for vanilla js

Question

Hello all, I'm having trouble understanding what's wrong with this simple request. Any ideas?  
  
const endpoint = 'https://api.cognitive.microsofttranslator.com/translate'  
const location = 'eastus2'  
const body =  [{ "text":"What is wrong with me?" }]  
const resp = await fetch(endpoint, {  
    method: 'post',  
    params: {  
          'api-version': '3.0',  
          'from': 'en',  
          'to': ['de', 'it']  
        },  
    headers: {  
          'Ocp-Apim-Subscription-Key': subscriptionKey,  
          'Ocp-Apim-Subscription-Region': location,  
          'Content-type': 'application/json',  
        },  
    body: body  
    })  
const data = await resp.json()  
console.log(JSON.stringify(data)  
return new Response(JSON.stringify(data))  

Answer 1

The "params" are not working, instead just use the URL! For instance:
https://api.cognitive.microsofttranslator.com/translate
to
https://api.cognitive.microsofttranslator.com/translate?api-version=3.0&from=en&to=tr