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();
}

Hi Ivan,

This approach would solve some issues I am trying to overcome.

Problem is, I can't get the about handler to kick in when /about is requested - "not found" only.

Are there extra steps implied?

Is there a specific version of core this worked with?

I expect that requesting http://192.168.0.132/about should do it.

http://192.168.0.132/ works as expected.

Thanks,
Nic

Hi Nic,

you have to implement the canHandle method, because default implementation is return false and you won't get control.

...
bool canHandle(HTTPMethod method, String uri) override {
if (method != HTTP_GET || uri != _uri) {
return false;
}
return true;
}

bool handle(ESP8266WebServer& server, HTTPMethod requestMethod, String requestUri) override {	
	if (!canHandle(requestMethod, requestUri)) { 
		return false;
	}

	server.send(200, "text/plain", "This is an about page");

	return true;
}

...

For me this was solution.

Regards,
Dex

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