sandbox / Mbed OS http-webserver-example

Webserver example for mbed OS 5 - HTTP 1.1 and multi-threaded

Dependencies:   mbed-http

mbed-os-example-http-server

This application demonstrates how to run an HTTP server on an mbed OS 5 device.

Request parsing is done through nodejs/http-parser.

To build

  1. Open mbed_app.json and change the network-interface option to your connectivity method (more info).
  2. Build the project in the online compiler or using mbed CLI.
  3. Flash the project to your development board.
  4. Attach a serial monitor to your board to see the debug messages.

Tested on

  • K64F with Ethernet.
  • NUCLEO_F411RE with ESP8266.

But every networking stack that supports the mbed OS 5 NetworkInterface API should work.

source/main.cpp

Committer:
Jan Jongboom
Date:
2017-07-31
Revision:
0:41f820ea137a

File content as of revision 0:41f820ea137a:

#include "mbed.h"
#include "easy-connect.h"
#include "http_server.h"
#include "http_response_builder.h"

Serial pc(USBTX, USBRX);
DigitalOut led(LED1);

// Requests come in here
void request_handler(ParsedHttpRequest* request, TCPSocket* socket) {

    printf("Request came in: %s %s\n", http_method_str(request->get_method()), request->get_url().c_str());

    if (request->get_method() == HTTP_GET && request->get_url() == "/") {
        HttpResponseBuilder builder(200);
        builder.set_header("Content-Type", "text/html; charset=utf-8");

        char response[] = "<html><head><title>Hello from mbed</title></head>"
            "<body>"
                "<h1>mbed webserver</h1>"
                "<button id=\"toggle\">Toggle LED</button>"
                "<script>document.querySelector('#toggle').onclick = function() {"
                    "var x = new XMLHttpRequest(); x.open('POST', '/toggle'); x.send();"
                "}</script>"
            "</body></html>";

        builder.send(socket, response, sizeof(response) - 1);
    }
    else if (request->get_method() == HTTP_POST && request->get_url() == "/toggle") {
        printf("toggle LED called\n");
        led = !led;

        HttpResponseBuilder builder(200);
        builder.send(socket, NULL, 0);
    }
    else {
        HttpResponseBuilder builder(404);
        builder.send(socket, NULL, 0);
    }
}

int main() {
    pc.baud(115200);

    // Connect to the network (see mbed_app.json for the connectivity method used)
    NetworkInterface* network = easy_connect(true);
    if (!network) {
        printf("Cannot connect to the network, see serial output\n");
        return 1;
    }

    HttpServer server(network);
    nsapi_error_t res = server.start(8080, &request_handler);

    if (res == NSAPI_ERROR_OK) {
        printf("Server is listening at http://%s:8080\n", network->get_ip_address());
    }
    else {
        printf("Server could not be started... %d\n", res);
    }

    wait(osWaitForever);
}