Request.text()
  The text() method of the Request interface
  reads the request body and returns it as a promise that resolves with a String.
  The response is always decoded using UTF-8.
Syntax
request.text().then(function (text) {
  // do something with the text sent in the request
});
Parameters
None.
Return value
A Promise that resolves with a String.
Examples
const text = "Hello world";
const request = new Request('/myEndpoint', {
  method: 'POST',
  body: text
});
request.text().then(function(text) {
  // do something with the text sent in the request
});
Specifications
| Specification | 
|---|
| Fetch Standard  # ref-for-dom-body-text①  | 
Browser compatibility
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