Custom ESP8266WebServer RequestHandler sample

AboutPage.h

#ifndef ABOUT_PAGE_H
#define ABOUT_PAGE_H

#include <ESP8266WebServer.h>

class AboutPage : public RequestHandler {
  public:
    AboutPage(const char* uri = "about")
    : _uri(uri)
    {
    }

    bool handle(ESP8266WebServer& server, HTTPMethod requestMethod, String requestUri) override { 
      if (requestMethod != HTTP_GET || requestUri != _uri) {
        return false;
      }
      
      server.send(200, "text/plain", "This is an about page");
      
      return true;
    }

  protected:
    String _uri;  
};


#endif //ABOUT_PAGE_H

RequestHandlerSample.ino

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include "AboutPage.h"


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

ESP8266WebServer server(80);

const int led = 13;

void handleRoot() {
  digitalWrite(led, 1);
  server.send(200, "text/plain", "hello from esp8266!");
  digitalWrite(led, 0);
}

void setup(void){
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  Serial.println("");

  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  if (MDNS.begin("esp8266")) {
    Serial.println("MDNS responder started");
  }

  server.on("/", handleRoot);
  server.addHandler(new AboutPage("/about"));

  server.begin();
  Serial.println("HTTP server started");
}

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

for me was solution change from
bool handle(ESP8266WebServer& server, HTTPMethod requestMethod, String requestUri);
to
bool handle(ESP8266WebServer& server, HTTPMethod requestMethod, const String& requestUri);
and of corse
bool canHandle(HTTPMethod requestMethod, String requestUri);
to
bool canHandle(HTTPMethod requestMethod, const String& requestUri);
In respect
p43k

p43k goooood