Error ESP8266 connect with firebase, I changed the esp8266 version to 2.7.4 and change the httpclient still have some problem

[L3WD35]

c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp: In member function 'bool FirebaseObject::isNullString(const String&) const': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp:71:57: warning: 'const char* ArduinoJson::Internals::JsonVariantCasts<TImpl>::asString() const [with TImpl = ArduinoJson::JsonVariant]' is deprecated (declared at c:\Users\super\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Deserialization/../JsonVariantCasts.hpp:28): use as<char*>() instead [-Wdeprecated-declarations] return variant.is<const char >() && variant.asString() == NULL; ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp: In member function 'ArduinoJson::JsonVariant FirebaseObject::getJsonVariant(const String&) const': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseObject.cpp:91:26: warning: 'ArduinoJson::JsonObject& ArduinoJson::Internals::JsonVariantCasts<TImpl>::asObject() const [with TImpl = ArduinoJson::JsonVariant]' is deprecated (declared at c:\Users\super\OneDrive\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/Deserialization/../JsonVariantCasts.hpp:23): use as<JsonObject>() instead [-Wdeprecated-declarations] json = json.asObject().get<JsonVariant>(start); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\Firebase.cpp: In member function 'void FirebaseStream::startStreaming(const string&, const string&, const string&)': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\Firebase.cpp:91:48: warning: deprecated conversion from string constant to 'char' [-Wwrite-strings] analyzeError("STREAM", status, path_with_auth); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'String FirebaseArduino::push(const String&, const ArduinoJson::JsonVariant&)': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:65:79: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] int status = req_.get()->sendRequest(host_, auth_, "POST", path.c_str(), buf); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'void FirebaseArduino::set(const String&, const ArduinoJson::JsonVariant&)': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:94:65: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] req_.get()->sendRequest(host_, auth_, "PUT", path.c_str(), buf); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'void FirebaseArduino::getRequest(const String&)': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:101:60: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] req_.get()->sendRequest(host_, auth_, "GET", path.c_str()); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'virtual void FirebaseArduino::remove(const String&)': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:147:63: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] req_.get()->sendRequest(host_, auth_, "DELETE", path.c_str()); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'virtual const String& FirebaseArduino::error()': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:201:33: warning: returning reference to temporary [-Wreturn-local-addr] return error_.message().c_str(); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp: In member function 'virtual void FirebaseHttpClientEsp8266::begin(const string&)': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:47:50: warning: 'bool HTTPClient::begin(String, String)' is deprecated (declared at C:\Users\super\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:177) [-Wdeprecated-declarations] http_.begin(url.c_str(), kFirebaseFingerprint); ^ c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp: In member function 'virtual void FirebaseHttpClientEsp8266::begin(const string&, const string&)': c:\Users\super\OneDrive\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:51:80: warning: 'bool HTTPClient::begin(String, uint16_t, String, String)' is deprecated (declared at C:\Users\super\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:178) [-Wdeprecated-declarations] http_.begin(host.c_str(), kFirebasePort, path.c_str(), kFirebaseFingerprint); ^

[TrickSumo]

In case anyone face same problem in future, downgrading ESP8266 board and ArduinoJSON library is only option as of now (September 2023). Steps to do same:- https://www.youtube.com/watch?v=m3Xb9GB9SI8