File content as of revision 9:66b6c19e9bb7:

/*
 * In this example the HTTP request (text) received from a browser is echoed (sent back) to the browser.
 * Ethernet connection is via an ENC28J60 Ethernet board driven by the UIPEthernet library
 */
#include "mbed.h"
#include "UipEthernet.h"

#define IP      "192.168.1.35"
#define GATEWAY "192.168.1.1"
#define NETMASK "255.255.255.0"
#define PORT    80

const uint8_t   MAC[6] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
UipEthernet     net(MAC, D11, D12, D13, D10);   // mac, mosi, miso, sck, cs
TcpServer       server;                         // Ethernet server
TcpClient*      client;
char            receiveBuf[1024];
char            echoHeader[256];
/**
 * @brief
 * @note
 * @param
 * @retval
 */
int main(void)
{
    printf("Starting ...\r\n");

    //net.set_network(IP, NETMASK, GATEWAY);  // include this to use static IP address
    net.connect();

    // Show the network address
    const char*     ip = net.get_ip_address();
    const char*     netmask = net.get_netmask();
    const char*     gateway = net.get_gateway();

    printf("IP address: %s\r\n", ip ? ip : "None");
    printf("Netmask: %s\r\n", netmask ? netmask : "None");
    printf("Gateway: %s\r\n\r\n", gateway ? gateway : "None");
    printf("------------------------------------------------------\r\n");
    printf("Usage: Type %s into your web browser and hit ENTER\r\n", net.get_ip_address());
    printf("------------------------------------------------------\r\n");

    /* Open the server on ethernet stack */
    server.open(&net);

    /* Bind the HTTP port (TCP 80) to the server */
    server.bind(PORT);

    /* Can handle 5 simultaneous connections */
    server.listen(5);

    while (1) {
        client = server.accept();

        if (client) {
            size_t receiveLen = client->recv((uint8_t*)receiveBuf, client->available());
            if (receiveBuf[0] == 'G' && receiveBuf[1] == 'E' && receiveBuf[2] == 'T') {
                printf("\r\n-------------------------------------------------------\r\n");
                printf("GET request received from a client with IP address %s\n\r", client->getpeername());
                printf("%s\r\n", receiveBuf);
                sprintf
                (
                    echoHeader,
                    "HTTP/1.1 200 OK\r\nContent-Length: %d\r\nContent-Type: text\r\nConnection: About to close\r\n\r\n",
                    receiveLen
                );
                client->send((uint8_t*)echoHeader, strlen(echoHeader));
                client->send((uint8_t*)receiveBuf, receiveLen);
                printf("Echo done.\r\n");
            }
            client->close();
        }
    }
}