When I try to send data through http, with the get method, it doesn't send the names and values pairs.

UIflow with blocks:

When I look at the code, I don't see it send the string with the name and value pair.

According to this web page, the program would have to send you the data arguments.
https://makeblock-micropython-api.readthedocs.io/en/latest/public_library/Third-party-libraries/urequests.html#urequests.request
I have tried to write by hand, without success.

Have any of the readers succeeded, send data to a server via http?

This is the server code, written for node js, in case you want to try it at: https://repl.it/ o en https://glitch.com/

var http = require('http');
var url = require('url');

var x_gyr = 0.0;

/* https://echo-data-get-method-http-get.mariomoreno2020.repl.run/t.htm?x=15 */

http.createServer(function (req, res) {
  // Set CORS headers
	res.setHeader('Access-Control-Allow-Origin', '*');
	res.setHeader('Access-Control-Request-Method', '*');
	res.setHeader('Access-Control-Allow-Methods', 'OPTIONS, GET, POST, PUT');
	res.setHeader('Access-Control-Allow-Headers', '*');
  res.statusCode = 200;
  //
  res.writeHead(200, {'Content-Type': 'text/html'});
  var q = url.parse(req.url, true);
  console.log(q.href);
  if (q.pathname == '/t.html') {
    q = q.query;
    x_gyr = q.x;
  }   
  var txt = 'x= ' + x_gyr;
  res.end(txt);
}).listen(8080);

Remember that the http block, the url is 'http' instead of 'https'.

And if you want to try the UIFlow code, here is a download link. You can see how in the blocks it sends data and in the python code no.
https://mega.nz/#!YY82UIrB!fskiB3YAn1hQH6rCcbwzjiuJO5-Fz0H4LBr6LZ4WtjI