Test websocket with FASTAPI 07.07.21

fastapi:
import fastapi
from fastapi import WebSocket
from fastapi_utils.cbv import cbv
from typing  import Optional

router = fastapi.APIRouter()

# test here:  https://www.websocket.org/echo.html                                                                                    
@router.websocket("/log_mail")
async def websocket_endpoint(websocket: WebSocket):
  await websocket.accept()
  while True:
    data = await websocket.receive_text()
    await websocket.send_text(f"Message text was: {data}")

javascript: 
  var log = new Log2textarea("logger2");
  window.onload = async  function () {
  log.info("...start websocket");
  //let socket = new WebSocket("wss://javascript.info/article/websocket/demo/hello");                                                
  //let socket = new WebSocket("ws://localhost:8071/log/mail");                                                                      
  let url = "ws://127.0.0.1:8071/log_mail";
  let socket = new WebSocket(url);

log.info(url);

socket.onopen = function(e)
  {
    log.info("[open] Connection established");
    log.info("Sending to server");
    socket.send("My name is foo");
  };

socket.onmessage = function(event)
  {
    log.info(`[message] Data received from server: ${event.data}`);
  };

socket.onclose = function(event)
  {
    if (event.wasClean)
    {
      log.info(`[close] Connection closed cleanly, code=${event.code} reason=${event.reason}`);
    }
    else
    {
    // e.g. server process killed or network down                                                                                    
    // event.code is usually 1006 in this case                                                                                       
      log.info('[close] Connection died');
  }
  };

socket.onerror = function(error)
  {
    log.info(`[error] ${error.message}`);
  };

};

//or  test here
//https://www.websocket.org/echo.html

https://www.websocket.org/echo.html

Anonymous

Test websocket with FASTAPI 07.07.21

Information Epoch 1638440216