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the WiFiServer Example is unfunctional: https://github.com/esp8266/Arduino/blob/master/doc/esp8266wifi/server-examples.rst #6661

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dsyleixa opened this issue Oct 22, 2019 · 4 comments · Fixed by #7697
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the WiFiServer Example is unfunctional: https://github.com/esp8266/Arduino/blob/master/doc/esp8266wifi/server-examples.rst #6661

dsyleixa opened this issue Oct 22, 2019 · 4 comments · Fixed by #7697
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component: documentation component: examples

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@dsyleixa
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dsyleixa commented Oct 22, 2019 •
edited
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the WiFiServer Example is unfunctional: https://github.com/esp8266/Arduino/blob/master/doc/esp8266wifi/server-examples.rst

Arduino 1.8.9
nodeMCU core 2.5.2
Windows 7/64 pro
Firefox 69.0.3

(with core 2.2.0 it still works, but longer for cores since 2.4.x - 2.5.x)

after entering the IP ( 192.168.2.107/ ) there immediately is the website
error:

Fehler: Verbindung unterbrochen

Die Verbindung zum Server wurde zurückgesetzt, während die Seite geladen wurde.

Die Website könnte vorübergehend nicht erreichbar sein, versuchen Sie es bitte später nochmals.
Wenn Sie auch keine andere Website aufrufen können, überprüfen Sie bitte die Netzwerk-/Internetverbindung.
Wenn Ihr Computer oder Netzwerk von einer Firewall oder einem Proxy geschützt wird, stellen Sie bitte sicher, dass Firefox auf das Internet zugreifen darf.

English translation:

Error: Connection interrupted

The connection to the server was reset while the page was loading.

The website may be temporarily down, please try again later.
If you can not visit another website, please check the network / internet connection.
If your computer or network is protected by a firewall or proxy, please make sure that Firefox can access the Internet.

source code:

#include <ESP8266WiFi.h>

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

WiFiServer server(80);


void setup()
{
  Serial.begin(115200);
  Serial.println();

  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" connected");

  server.begin();
  Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str());
}


// prepare a web page to be send to a client (web browser)
String prepareHtmlPage()
{
  String htmlPage =
     String("HTTP/1.1 200 OK\r\n") +
            "Content-Type: text/html\r\n" +
            "Connection: close\r\n" +  // the connection will be closed after completion of the response
            "Refresh: 5\r\n" +  // refresh the page automatically every 5 sec
            "\r\n" +
            "<!DOCTYPE HTML>" +
            "<html>" +
            "Analog input:  " + String(analogRead(A0)) +
            "</html>" +
            "\r\n";
  return htmlPage;
}


void loop()
{
  WiFiClient client = server.available();
  // wait for a client (web browser) to connect
  if (client)
  {
    Serial.println("\n[Client connected]");
    while (client.connected())
    {
      // read line by line what the client (web browser) is requesting
      if (client.available())
      {
        String line = client.readStringUntil('\r');
        Serial.print(line);
        // wait for end of client's request, that is marked with an empty line
        if (line.length() == 1 && line[0] == '\n')
        {
          client.println(prepareHtmlPage());
          break;
        }
      }
    }
    delay(1); // give the web browser time to receive the data

    // close the connection:
    client.stop();
    Serial.println("[Client disonnected]");
  }
}

Serial-output:

Connecting to WLAN-3YA7LD .......... connected
Web server started, open 192.168.2.107 in a web browser

[Client connected]
[Client disonnected]

[Client connected]
GET / HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
[Client disonnected]

[Client connected]
GET /favicon.ico HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: image/webp,/
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
[Client disonnected]

[Client connected]
GET / HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
[Client disonnected]

[Client connected]
GET /favicon.ico HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: image/webp,/
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
[Client disonnected]

[Client connected]
GET / HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Pragma: no-cache
Cache-Control: no-cache
[Client disonnected]

[Client connected]
GET /favicon.ico HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: image/webp,/
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
[Client disonnected]
@dsyleixa
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dsyleixa commented Oct 22, 2019 •
edited
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instead, with the old core 2.2.0 the example works,
the website shows the line

Analog input: 2

and the Serial output is:

Connecting to WLAN-3YA7LD ........ connected
Web server started, open 192.168.2.107 in a web browser

[Client connected]
GET / HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
[Client disonnected]

[Client connected]
GET /favicon.ico HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: image/webp,/
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
[Client disonnected]

[Client connected]
GET / HTTP/1.1
Host: 192.168.2.107
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0
[Client disonnected]

@devyte
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devyte commented Oct 30, 2019

That example is beyond awful and semantically wrong. I suppose it needs updating (I just tested it indeed it doesn't work).

@d-a-v d-a-v mentioned this issue Nov 9, 2020
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@dsyleixa
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hello,
I see some messed-up code in green in red but where is the cleaned-up example, ready for upload and use?

@d-a-v
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d-a-v commented Nov 11, 2020 •
edited
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In git master
https://github.com/esp8266/Arduino/blob/master/doc/esp8266wifi/server-examples.rst#put-it-together
Readthedoc seems not yet updated
https://arduino-esp8266.readthedocs.io/en/latest/esp8266wifi/server-examples.html#put-it-together

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update documentation example d-a-v/Arduino
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@d-a-v @devyte @dsyleixa