Empty reply from server / no data found for resource with given identifier

[mofada]

Platform

• Hardware: [ESP-12|ESP-01|ESP-07|ESP8285 device|other]
• Core Version: [latest git hash or date]
• Development Env: [Arduino IDE]
• Operating System: [Windows]

Settings in IDE

• Module: [Wemos D1 mini r2]
• Flash Mode: [qio|dio|other]
• Flash Size: [4MB]
• lwip Variant: [v1.4|v2 Lower Memory|Higher Bandwidth]
• Reset Method: [ck|nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz|160MHz]
• Upload Using: [OTA|SERIAL]
• Upload Speed: [115200|other] (serial upload only)

Problem Description

expected

I wrote a piece of code to connect to WiFi via http and when I enter the correct ssid and password everything works as expected.

{"message":"connect success!","code":0,"data":{"ssid":"fada","password":"fada-8888","rssi":-62,"localIP":192.168.0.103,"deviceId":6303019}}

fail

When I pass in a non-existing ssid, or a wrong password
chrome no data found for resource with given identifier

C:\Users\fada>curl http://192.168.4.1/wifi?ssid=fada1
curl: (52) Empty reply from server`

My expected return:
{"message":"wifi password wrong!","code":203}

code

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>

ESP8266WebServer esp8266_server(80);

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

  WiFi.mode(WIFI_STA);
  WiFi.softAP("khc-" + String(ESP.getChipId()), "88888888");

  // start server
  esp8266_server.begin();
  esp8266_server.keepAlive(true);
  esp8266_server.on("/wifi", HTTP_GET, handlePutWifi);

  WiFi.printDiag(Serial);
  Serial.setDebugOutput(true);
}

void loop()
{
  esp8266_server.handleClient();
}

/**
   @brief connect wifi

*/
void handlePutWifi()
{
  if (!esp8266_server.hasArg("ssid"))
  {
    // check params
    esp8266_server.send(200, "application/json;charset=utf-8", "{\"message\":\"message is required\",\"code\":-1}");
    return;
  }

  // get params
  String ssid = esp8266_server.arg("ssid");
  String password = esp8266_server.arg("password");
  // set not connect
  WiFi.setAutoReconnect(false);
  // connect wifi
  WiFi.begin(ssid.c_str(), password.c_str());
  // timeout  15s
  int8_t status = WiFi.waitForConnectResult(15 * 1000L);

  if (status == WL_CONNECTED)
  {
    // success return ip/deviceId
    esp8266_server.send(200, "application/json;charset=utf-8", "{\"message\":\"connect success!\",\"code\":0,\"data\":{\"ssid\":\"" + WiFi.SSID() + "\",\"password\":\"" + WiFi.psk() + "\",\"rssi\":" + WiFi.RSSI() + ",\"localIP\":" + WiFi.localIP().toString() + ",\"deviceId\":" + ESP.getChipId() + "}}");
  }
  else if (status == WL_NO_SSID_AVAIL)
  {
    esp8266_server.send(200, "application/json;charset=utf-8", "{\"message\":\"wifi ssid not avail!\",\"code\":202}");
  }
  else if (status == WL_WRONG_PASSWORD)
  {
    esp8266_server.send(200, "application/json;charset=utf-8", "{\"message\":\"wifi password wrong!\",\"code\":203}");
  }
  else
  {
    esp8266_server.send(200, "application/json;charset=utf-8", "{\"message\":\"connect fail!\",\"code\":204}");
  }
}

Debug Messages

station: 08:1f:71:ac join, AID = 1
scandone
scandone
switch to channel 6
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt 
state: 5 -> 0 (2)
rm 0

[enjoyneering]

Looks like the "waitForConnectResult()" returns -1 insted of actual status. By the way default timeout is 60sec.

[mofada]

Looks like the "waitForConnectResult()" returns -1 insted of actual status. By the way default timeout is 60sec.

If -1 is returned, the last else will be hit, and then return
{"message":"connect fail!","code":204}

[mofada]

WiFi.waitForConnectResult(15 * 1000L)

I passed in a timeoutWiFi.waitForConnectResult(15 * 1000L)

[enjoyneering]

If -1 is returned, the last else will be hit, and then return
{"message":"connect fail!","code":204}

no, because esp is not connected to netwok :)

[mofada]

Ah? Then it should also hit the send，and will the station mode be turned off?

[mofada]

If the wifi ssid and password are correct, the request duration 25s will still be returned

{"message":"connect success!","code":0,"data":{"ssid":"LLWW","password":"LLWW123123","rssi":-75,"localIP":192.168.9.181,"deviceId":3707097}}

[mofada]

If the password is wrong, 12s ends the request and no message is returned

[mofada]

@enjoyneering can anyone help me？

[mofada]

The client appears to be lost halfway through the connection

[mcspr]

The client appears to be lost halfway through the connection

Arduino/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp

Line 228 in cf6ff4c

WiFiClient::stopAll();

try removing this line in your Core installation folder, usually at %LOCALAPPDATA%\Arduino15\packages\esp8266\hardware\...

[mofada]

The client appears to be lost halfway through the connection

Arduino/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp

Line 228 in cf6ff4c

WiFiClient::stopAll();

try removing this line in your Core installation folder, usually at %LOCALAPPDATA%\Arduino15\packages\esp8266\hardware\...

Solved my problem, which has been bothering me for a long time, thanks a lot

[mofada]

The client appears to be lost halfway through the connection

Arduino/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp

Line 228 in cf6ff4c

WiFiClient::stopAll();

try removing this line in your Core installation folder, usually at %LOCALAPPDATA%\Arduino15\packages\esp8266\hardware\...

My problem was solved by modifying the source code, is there any other solution without modifying the source code? Such a solution does not seem to be the optimal solution

[mcspr]

My problem was solved by modifying the source code, is there any other solution without modifying the source code? Such a solution does not seem to be the optimal solution

Next release will no longer include the code in question.