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HTTP Server

Table of Contents

  1. Packages
  2. Library

Packages

Precompiled version: http://mbed.org/users/donatien/programs/NetServicesLPC1768

Library

Architecture

The HttpServer is composed of:

  • The actual server (HttpServer)
  • A request dispatcher, instanciated on each request (HttpRequestDispatcher)
  • Request handlers instanciated by the dispatcher(deriving from HttpRequestHandler)

Requests Handler

Includes

#include "HttpServer.h"

Reference

HttpServer()

Instantiate the HTTP server.

template<typename T>
void addHandler(const char* path)

Append an handler of type T to the handlers list, for requests of path starting with path.

void bind(int port = 80)

Bind the server to port port and start listening. This function returns immediately. You must call Net::poll() regularly after this so that the server serves requests properly.

Examples

This example sets the server up and demonstrates the use of all-three kinds of handlers.

The local file system is available under the /webfs/ path. Since FSHandler is the default handler here, the mbed file system (/) is made available on the root path of the server as well, so mbed.htm is available at the URL : http://a.b.c.d/webfs/mbed.htm, where a.b.c.d is your mbed's IP address.

#include "mbed.h"
#include "EthernetNetIf.h"
#include "HttpServer.h"

DigitalOut led1(LED1, "led1");
DigitalOut led2(LED2, "led2");
DigitalOut led3(LED3, "led3");
DigitalOut led4(LED4, "led4");

LocalFileSystem fs("webfs");

EthernetNetIf eth;  
HttpServer svr;

int main() {
  Base::add_rpc_class<DigitalOut>();

  Net::setDefaultIf(eth);
  
  printf("\r\nSetting up...\r\n");
  EthernetErr ethErr = eth.setup();
  if(ethErr)
  {
    printf("Error %d in setup.\n", ethErr);
    return -1;
  }
  printf("\r\nSetup OK\r\n");
  
  svr.addHandler<SimpleHandler>("/hello");
  svr.addHandler<RpcHandler>("/rpc");
  svr.addHandler<FSHandler>(""); //Default handler
  //Example : Access to mbed.htm : http://a.b.c.d/webfs/mbed.htm
  
  svr.bind(80);
  
  printf("\r\nListening...\r\n");
    
  Timer tm;
  tm.start();
  //Listen indefinitely
  while(true)
  {
    Net::poll();
    if(tm.read()>.5)
    {
      led1=!led1; //Show that we are alive
      tm.start();
    }
  }
  
  return 0;

}

You can also directly import this example there: http://mbed.org/users/donatien/programs/NetHttpServerExample

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