esp-load-test.ino

#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>

const char* ssid = "SSID";
const char* password = "pass";

WiFiServer server(80);

void setup() {
  Serial.begin(9600);

  // Connecting to WiFi as an station
  Serial.print("[WiFi] Connecting.");
  WiFi.begin(ssid, password);

  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print('.');
  }

  Serial.println(' ');
  Serial.println("[WiFi] Connected to ssid: " + String(ssid));
  Serial.print("[WiFi] IP: ");
  Serial.println(WiFi.localIP());

  // Start the MDNS server
  if (MDNS.begin("esp-load-test")) {
    Serial.println("[MDNS] Serving: esp-load-test.local");
  }

  server.begin();
  server.setNoDelay(true);
}

String getHTMLHead(){
  String htmlPage =
     String("HTTP/1.1 200 OK\r\n") +
            "Content-Type: application/octet-stream\r\n" +
            "Content-Length: 999999999999\r\n" +
            "Connection: close\r\n" +
            "\r\n";
            
  return htmlPage;
}

void loop() {
  WiFiClient client = server.available();
  if (client && client.connected()) {
    Serial.println("A client found.");
    String line = client.readStringUntil('\n');
    Serial.println(line);

    client.println(getHTMLHead());
    while(client.status()) {
       const int bufSize = 1460;
       // Initialize a random set of bytes
       byte clientBuf[bufSize];
       client.write((const uint8_t *)clientBuf, bufSize);
    }
    Serial.println("Client stopped.");
  }
}

How can I run your code with my devices,
I don't know how to run your NodeJS file

@Bladetuab incase you never worked this out, or for others finding themselves here:

The node.js code appears to make a request to the / URL on the webserver.

So to do this without node, something like:

curl -vo /dev/null  http://192.168.2.109/

...changing the IP to match what is displayed in the serial console. You could also hit that URL in a web-browser.

-o /dev/null ensures the file doesn't save locally, which is the purpose of the Node test client as per the tutorial.

I tested this code deployed to my NodeMCU w/ ESP8266 and it worked.