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Put-Post-Echo.ino
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/**
* Example for the ESP32 HTTP(S) Webserver
*
* IMPORTANT NOTE:
* To run this script, your need to
* 1) Enter your WiFi SSID and PSK below this comment
* 2) Make sure to have certificate data available. You will find a
* shell script and instructions to do so in the library folder
* under extras/
*
* This script will install an HTTPS Server on your ESP32 with the following
* functionalities:
* - Show simple page on web server root
* - Provide an Echo-Service for PUT/POST requests on /
* - 404 for everything else
*/
// TODO: Configure your WiFi here
#define WIFI_SSID "<your ssid goes here>"
#define WIFI_PSK "<your pre-shared key goes here>"
// Include certificate data (see note above)
#include "cert.h"
#include "private_key.h"
// We will use wifi
#include <WiFi.h>
// Includes for the server
#include <HTTPSServer.hpp>
#include <SSLCert.hpp>
#include <HTTPRequest.hpp>
#include <HTTPResponse.hpp>
// The HTTPS Server comes in a separate namespace. For easier use, include it here.
using namespace httpsserver;
// Create an SSL certificate object from the files included above
SSLCert cert = SSLCert(
example_crt_DER, example_crt_DER_len,
example_key_DER, example_key_DER_len
);
// Create an SSL-enabled server that uses the certificate
// The contstructor takes some more parameters, but we go for default values here.
HTTPSServer secureServer = HTTPSServer(&cert);
// Declare some handler functions for the various URLs on the server
// The signature is always the same for those functions. They get two parameters,
// which are pointers to the request data (read request body, headers, ...) and
// to the response data (write response, set status code, ...)
void handleRoot(HTTPRequest * req, HTTPResponse * res);
void handleEcho(HTTPRequest * req, HTTPResponse * res);
void handle404(HTTPRequest * req, HTTPResponse * res);
void setup() {
// For logging
Serial.begin(115200);
// Connect to WiFi
Serial.println("Setting up WiFi");
WiFi.begin(WIFI_SSID, WIFI_PSK);
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.print("Connected. IP=");
Serial.println(WiFi.localIP());
// For every resource available on the server, we need to create a ResourceNode
// The ResourceNode links URL and HTTP method to a handler function
ResourceNode * nodeRoot = new ResourceNode("/", "GET", &handleRoot);
ResourceNode * node404 = new ResourceNode("", "GET", &handle404);
// Register the echo handler. You can use the same handler function for multiple
// nodes. Note also that we now have three resource nodes for the / URL, so
// the server uses only the method to distinguish between them.
ResourceNode * nodeEchoPut = new ResourceNode("/", "PUT", &handleEcho);
ResourceNode * nodeEchoPost = new ResourceNode("/", "POST", &handleEcho);
// Add the root node to the server
secureServer.registerNode(nodeRoot);
// Add the nodes for the echo service
secureServer.registerNode(nodeEchoPut);
secureServer.registerNode(nodeEchoPost);
// Add the 404 not found node to the server.
// The path is ignored for the default node.
secureServer.setDefaultNode(node404);
Serial.println("Starting server...");
secureServer.start();
if (secureServer.isRunning()) {
Serial.println("Server ready.");
}
}
void loop() {
// This call will let the server do its work
secureServer.loop();
// Other code would go here...
delay(1);
}
void handleRoot(HTTPRequest * req, HTTPResponse * res) {
// Status code is 200 OK by default.
// We want to deliver a simple HTML page, so we send a corresponding content type:
res->setHeader("Content-Type", "text/html");
// The response implements the Print interface, so you can use it just like
// you would write to Serial etc.
res->println("<!DOCTYPE html>");
res->println("<html>");
res->println("<head><title>Hello World!</title></head>");
res->println("<body>");
res->println("<h1>Hello World!</h1>");
res->print("<p>Your server is running for ");
// A bit of dynamic data: Show the uptime
res->print((int)(millis()/1000), DEC);
res->println(" seconds.</p>");
res->print("<p>The easiest way to test the echo function is to use an HTTP debugging "
" tool where you are able to set a body and then let it call PUT or POST on"
" https://");
res->print(WiFi.localIP());
res->print("/. Otherwise you can use command line tools like curl:</p>"
"<pre>cat <<EOF | curl --insecure -X PUT -d @- https://");
res->print(WiFi.localIP());
res->print("/\nHere goes your request \nbody\n"
"EOF</pre>");
res->println("</body>");
res->println("</html>");
}
void handleEcho(HTTPRequest * req, HTTPResponse * res) {
// The echo callback will return the request body as response body.
// We use text/plain for the response
res->setHeader("Content-Type","text/plain");
// Stream the incoming request body to the response body
// Theoretically, this should work for every request size.
byte buffer[256];
// HTTPReqeust::requestComplete can be used to check whether the
// body has been parsed completely.
while(!(req->requestComplete())) {
// HTTPRequest::readBytes provides access to the request body.
// It requires a buffer, the max buffer length and it will return
// the amount of bytes that have been written to the buffer.
size_t s = req->readBytes(buffer, 256);
// The response does not only implement the Print interface to
// write character data to the response but also the write function
// to write binary data to the response.
res->write(buffer, s);
}
}
void handle404(HTTPRequest * req, HTTPResponse * res) {
// Discard request body, if we received any
// We do this, as this is the default node and may also server POST/PUT requests
req->discardRequestBody();
// Set the response status
res->setStatusCode(404);
res->setStatusText("Not Found");
// Set content type of the response
res->setHeader("Content-Type", "text/html");
// Write a tiny HTTP page
res->println("<!DOCTYPE html>");
res->println("<html>");
res->println("<head><title>Not Found</title></head>");
res->println("<body><h1>404 Not Found</h1><p>The requested resource was not found on this server.</p></body>");
res->println("</html>");
}