Akifumi Takahashi / HTTP_SERVER

The library with which to make your mbed a HTTP Server which just reads HTML files in the mbed and sends it to the clients.

Dependents:   httpserversample SIMPLE_WSS

Quote:

This library depends on EthernetInterface class, TCPSocketServer class and TCPSocketConnection class. These classes can be imported at EthernetInterface library. Moreover, the EthernetInterface library depends on the mbed-rtos library, so import it here.

Abstract

This is the library to make a mbed a simple HTTP server. With this library, a mbed can understand only GET requests, and can send clients htm or jpg files as a response.

Handleable Requests:

  • GET

Handleable files:

  • html
  • jpg

Note the length of the Filename

A mbed can handle only 8.3 filename (also called as "short filename" or SFN), such as index.htm (in this case, length of the filename is 5.3).

Sample Code

Running the code below, if your mbed is connected to a network, you can see an IP address of the mbed on your console. (When connecting the mbed to a PC with USB, the baud rate should be 9600)

Hello World

#include "mbed.h"
#include "HTTP_SERVER.h"
int main()
{
    HttpServer httpsvr;
    if(httpsvr.init()){
        if(httpsvr.run() == 0)
            printf("end\r\n");
        else
            printf("error end\r\n");
    }
    return 0;
}

As an example, make a index.htm like below (NOT .html; the reason is referred above) in the mbed, and access to <the IP address>/index.htm with a web browser on your PC or any terminals on the network the mbed is connected to, then you would be able to see the page.

index.htm in mbed

<!DOCTYPE html>
<html>
<head>
<title>mbed http server demo</title>
</head>
<body>
	<h1>Mbed Simple HTTP Server</h1> 
	hello world<br />
	<a href="./index.htm" terget="self">Hyper Link Test</a><br />
</body>
</html>

HTTP_SERVER.cpp@0:cc483bea4fe3, 2016-02-16 (annotated)

Committer:
aktk
Date:
Tue Feb 16 10:59:31 2016 +0000
Revision:
0:cc483bea4fe3
Child:
1:3a1fe94c6e42
add comment

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aktk 0:cc483bea4fe3 1 #include "HTTP_SERVER.h"
aktk 0:cc483bea4fe3 2 #define DEBUG
aktk 0:cc483bea4fe3 3 HttpServer::HttpServer()
aktk 0:cc483bea4fe3 4 {
aktk 0:cc483bea4fe3 5 keep_alive = (false);
aktk 0:cc483bea4fe3 6 listening_flag = (false);
aktk 0:cc483bea4fe3 7 req_buf[0] = '\0';
aktk 0:cc483bea4fe3 8 }
aktk 0:cc483bea4fe3 9
aktk 0:cc483bea4fe3 10 HttpServer::~HttpServer()
aktk 0:cc483bea4fe3 11 {
aktk 0:cc483bea4fe3 12 }
aktk 0:cc483bea4fe3 13
aktk 0:cc483bea4fe3 14 bool HttpServer::init()
aktk 0:cc483bea4fe3 15 {
aktk 0:cc483bea4fe3 16
aktk 0:cc483bea4fe3 17 // Ethernet Initialization
aktk 0:cc483bea4fe3 18 if(eth.init()) {
aktk 0:cc483bea4fe3 19 printf("Error!@EthernetInterface::init()\r\n");
aktk 0:cc483bea4fe3 20 return false;
aktk 0:cc483bea4fe3 21 }
aktk 0:cc483bea4fe3 22 // Ethernet Connecting setup
aktk 0:cc483bea4fe3 23 if(eth.connect()) {
aktk 0:cc483bea4fe3 24 printf("Error!@EthernetInterface::connect()\r\n");
aktk 0:cc483bea4fe3 25 return false;
aktk 0:cc483bea4fe3 26 } else {
aktk 0:cc483bea4fe3 27 printf("IP Address is %s\r\n", eth.getIPAddress());
aktk 0:cc483bea4fe3 28 }
aktk 0:cc483bea4fe3 29 // TCP Socket setup
aktk 0:cc483bea4fe3 30 // To open Server-side PORT
aktk 0:cc483bea4fe3 31 if(tcpsvr.bind(TCP_PORT)< 0) {
aktk 0:cc483bea4fe3 32 printf("Error!@TCPSocketServer::bind()\r\n");
aktk 0:cc483bea4fe3 33 return false;
aktk 0:cc483bea4fe3 34 } else {
aktk 0:cc483bea4fe3 35 printf("TCP Server has bounden!\r\n");
aktk 0:cc483bea4fe3 36 }
aktk 0:cc483bea4fe3 37 // Server start listening Request from a web browser.
aktk 0:cc483bea4fe3 38 if(tcpsvr.listen(1) < 0) {
aktk 0:cc483bea4fe3 39 printf("tcp server listen failed.\r\n");
aktk 0:cc483bea4fe3 40 return false;
aktk 0:cc483bea4fe3 41 } else {
aktk 0:cc483bea4fe3 42 listening_flag = true;
aktk 0:cc483bea4fe3 43 printf("tcp server is listening...\r\n");
aktk 0:cc483bea4fe3 44 }
aktk 0:cc483bea4fe3 45
aktk 0:cc483bea4fe3 46 return true;
aktk 0:cc483bea4fe3 47 }
aktk 0:cc483bea4fe3 48
aktk 0:cc483bea4fe3 49 bool HttpServer::run()
aktk 0:cc483bea4fe3 50 {
aktk 0:cc483bea4fe3 51 DigitalOut led1(LED1);
aktk 0:cc483bea4fe3 52 DigitalOut led2(LED1);
aktk 0:cc483bea4fe3 53
aktk 0:cc483bea4fe3 54 while (listening_flag) {
aktk 0:cc483bea4fe3 55 led1 = true;
aktk 0:cc483bea4fe3 56 // blocking mode (never timeout)
aktk 0:cc483bea4fe3 57 // waiting client connection
aktk 0:cc483bea4fe3 58 printf("\r\nwait connection\r\n");
aktk 0:cc483bea4fe3 59 if(tcpsvr.accept(tcpcon) < 0) {
aktk 0:cc483bea4fe3 60 printf("failed to accept connection.\r\n");
aktk 0:cc483bea4fe3 61 return -1;
aktk 0:cc483bea4fe3 62 } else {
aktk 0:cc483bea4fe3 63 printf("connection success!\r\nIP: %s\r\n",tcpcon.get_address());
aktk 0:cc483bea4fe3 64 led2 = true;
aktk 0:cc483bea4fe3 65 }
aktk 0:cc483bea4fe3 66 //while(client.is_connected()) {
aktk 0:cc483bea4fe3 67 while(tcpcon.is_connected()) {
aktk 0:cc483bea4fe3 68 #ifdef DEBUG
aktk 0:cc483bea4fe3 69 printf("being connected\r\n");
aktk 0:cc483bea4fe3 70 #endif
aktk 0:cc483bea4fe3 71 char buffer[1024] = {0};
aktk 0:cc483bea4fe3 72 char* httpmethod = NULL;
aktk 0:cc483bea4fe3 73 char* filepath = NULL;
aktk 0:cc483bea4fe3 74 char* http_ver = NULL;
aktk 0:cc483bea4fe3 75 char* header_field_name = NULL;
aktk 0:cc483bea4fe3 76 char* header_field_val = NULL;
aktk 0:cc483bea4fe3 77 //
aktk 0:cc483bea4fe3 78 // Request Analysis
aktk 0:cc483bea4fe3 79 //
aktk 0:cc483bea4fe3 80 #ifdef DEBUG
aktk 0:cc483bea4fe3 81 printf("debug\r\n");
aktk 0:cc483bea4fe3 82 #endif
aktk 0:cc483bea4fe3 83 switch(tcpcon.receive(buffer, 1023)) {
aktk 0:cc483bea4fe3 84 case 0:
aktk 0:cc483bea4fe3 85 printf("recieved buffer is empty.\r\n");
aktk 0:cc483bea4fe3 86 msger.setStatusLine(400, "No Request");
aktk 0:cc483bea4fe3 87 httpmethod = NULL;
aktk 0:cc483bea4fe3 88 filepath = NULL;
aktk 0:cc483bea4fe3 89 http_ver = NULL;
aktk 0:cc483bea4fe3 90 break;
aktk 0:cc483bea4fe3 91 case -1:
aktk 0:cc483bea4fe3 92 printf("failed to read data from client.\r\n");
aktk 0:cc483bea4fe3 93 msger.setStatusLine(500, "Internal Server Error");
aktk 0:cc483bea4fe3 94 httpmethod = NULL;
aktk 0:cc483bea4fe3 95 filepath = NULL;
aktk 0:cc483bea4fe3 96 http_ver = NULL;
aktk 0:cc483bea4fe3 97 break;
aktk 0:cc483bea4fe3 98 default:
aktk 0:cc483bea4fe3 99 printf("Recieved Data: %d\r\n\r\n%.*s\r\n",strlen(buffer),strlen(buffer),buffer);
aktk 0:cc483bea4fe3 100 // get HTTP method
aktk 0:cc483bea4fe3 101 httpmethod = strtok(buffer," ");
aktk 0:cc483bea4fe3 102 // get File path
aktk 0:cc483bea4fe3 103 filepath = strtok(NULL, " ");
aktk 0:cc483bea4fe3 104 // get HTTP version
aktk 0:cc483bea4fe3 105 http_ver = strtok(NULL, "\r\n");
aktk 0:cc483bea4fe3 106 #ifdef DEBUG
aktk 0:cc483bea4fe3 107 printf("httpmethod: %s\r\n", httpmethod);
aktk 0:cc483bea4fe3 108 printf("file path: %s\r\n", filepath);
aktk 0:cc483bea4fe3 109 printf("http ver : %s\r\n", http_ver);
aktk 0:cc483bea4fe3 110 #endif
aktk 0:cc483bea4fe3 111 break;
aktk 0:cc483bea4fe3 112 }
aktk 0:cc483bea4fe3 113 #ifdef DEBUG
aktk 0:cc483bea4fe3 114 printf("debug before response\r\n");
aktk 0:cc483bea4fe3 115 #endif
aktk 0:cc483bea4fe3 116 //
aktk 0:cc483bea4fe3 117 // Response
aktk 0:cc483bea4fe3 118 //
aktk 0:cc483bea4fe3 119 if (strcmp(httpmethod,"GET") == 0 ) {
aktk 0:cc483bea4fe3 120 printf("GET request incomming.\r\n");
aktk 0:cc483bea4fe3 121
aktk 0:cc483bea4fe3 122 // file calibration
aktk 0:cc483bea4fe3 123 #ifdef DEBUG
aktk 0:cc483bea4fe3 124 printf("file opening\r\n");
aktk 0:cc483bea4fe3 125 #endif
aktk 0:cc483bea4fe3 126 fhandl.open(filepath,"rb");
aktk 0:cc483bea4fe3 127 if(fhandl.arrival()) {
aktk 0:cc483bea4fe3 128 msger.setStatusLine(200, "OK");
aktk 0:cc483bea4fe3 129 if(msger.setHeaderField("Content-Length", fhandl.getFileSize()))printf("buffer over flow");
aktk 0:cc483bea4fe3 130 if(msger.setHeaderField("Connection", "keep-alive"))printf("buffer over flow");
aktk 0:cc483bea4fe3 131 } else {
aktk 0:cc483bea4fe3 132 if(msger.setStatusLine(404, "NOT FOUND"))printf("buffer over flow");
aktk 0:cc483bea4fe3 133 if(msger.setHeaderField("Connection", "close"))printf("buffer over flow");
aktk 0:cc483bea4fe3 134 #ifdef DEBUG
aktk 0:cc483bea4fe3 135 printf("NOT FOUND\r\n");
aktk 0:cc483bea4fe3 136 #endif
aktk 0:cc483bea4fe3 137 }
aktk 0:cc483bea4fe3 138 if(! ( strcmp(fhandl.getSuffix(), "htm" ) &&
aktk 0:cc483bea4fe3 139 strcmp(fhandl.getSuffix(), "HTM" ) &&
aktk 0:cc483bea4fe3 140 strcmp(fhandl.getSuffix(), "html") &&
aktk 0:cc483bea4fe3 141 strcmp(fhandl.getSuffix(), "HTML") )) {
aktk 0:cc483bea4fe3 142 if(msger.setHeaderField("Content-Type", "text/html"))printf("buffer over flow");
aktk 0:cc483bea4fe3 143 } else if (!strcmp(fhandl.getSuffix(), "ico" ) ) {
aktk 0:cc483bea4fe3 144 if(msger.setHeaderField("Content-Type", "image/png"))printf("buffer over flow");
aktk 0:cc483bea4fe3 145 } else {
aktk 0:cc483bea4fe3 146 msger.setStatusLine(406, "not acceptable");
aktk 0:cc483bea4fe3 147 }
aktk 0:cc483bea4fe3 148
aktk 0:cc483bea4fe3 149 // Connection timeout field
aktk 0:cc483bea4fe3 150 if(msger.setHeaderField("Keep-Alive", "timeouit=15"))printf("buffer over flow");
aktk 0:cc483bea4fe3 151 /* // Apply request header field to response header field
aktk 0:cc483bea4fe3 152 do {
aktk 0:cc483bea4fe3 153 //strtok(NULL, "\r\n");
aktk 0:cc483bea4fe3 154 header_field_name = strtok(NULL, ":");
aktk 0:cc483bea4fe3 155 header_field_name++;
aktk 0:cc483bea4fe3 156 //strtok(NULL, " ");
aktk 0:cc483bea4fe3 157 header_field_val = strtok(NULL, "\r\n");
aktk 0:cc483bea4fe3 158 header_field_val++;
aktk 0:cc483bea4fe3 159 #ifdef DEBUG
aktk 0:cc483bea4fe3 160 printf("header_field_name adr: %d %s\r\n", header_field_name - 1, header_field_name);
aktk 0:cc483bea4fe3 161 printf("header_field_val adr: %d %s\r\n", header_field_val - 1, header_field_val);
aktk 0:cc483bea4fe3 162 #endif
aktk 0:cc483bea4fe3 163 if(header_field_name - 1 != NULL) {
aktk 0:cc483bea4fe3 164 //if(strcmp(header_field_name,"Connection") == 0) {
aktk 0:cc483bea4fe3 165 // if(msger.setHeaderField(header_field_name, "close"))printf("buffer over flow");
aktk 0:cc483bea4fe3 166 //} else {
aktk 0:cc483bea4fe3 167 if(msger.setHeaderField(header_field_name, header_field_val))printf("buffer over flow");
aktk 0:cc483bea4fe3 168 //}
aktk 0:cc483bea4fe3 169 } else {
aktk 0:cc483bea4fe3 170 break;
aktk 0:cc483bea4fe3 171 }
aktk 0:cc483bea4fe3 172 } while(1);
aktk 0:cc483bea4fe3 173 */
aktk 0:cc483bea4fe3 174 #ifdef DEBUG
aktk 0:cc483bea4fe3 175 //printf("status code : %d\r\n", status_code);
aktk 0:cc483bea4fe3 176 //printf("content type: %s\r\n", content_type);
aktk 0:cc483bea4fe3 177 #endif
aktk 0:cc483bea4fe3 178
aktk 0:cc483bea4fe3 179 // send response
aktk 0:cc483bea4fe3 180 msger.sendHTTPResponse(tcpcon, fhandl);
aktk 0:cc483bea4fe3 181
aktk 0:cc483bea4fe3 182 //file close
aktk 0:cc483bea4fe3 183 #ifdef DEBUG
aktk 0:cc483bea4fe3 184 if(
aktk 0:cc483bea4fe3 185 #endif
aktk 0:cc483bea4fe3 186 fhandl.close()
aktk 0:cc483bea4fe3 187 #ifndef DEBUG
aktk 0:cc483bea4fe3 188 ;
aktk 0:cc483bea4fe3 189 #endif
aktk 0:cc483bea4fe3 190 #ifdef DEBUG
aktk 0:cc483bea4fe3 191 == 0)
aktk 0:cc483bea4fe3 192 printf("file has closed\r\n");
aktk 0:cc483bea4fe3 193 else if(EOF)
aktk 0:cc483bea4fe3 194 printf("failed to close the file\r\n");
aktk 0:cc483bea4fe3 195 #endif
aktk 0:cc483bea4fe3 196 msger.resetHeader();
aktk 0:cc483bea4fe3 197 printf("echo back done.\r\n");
aktk 0:cc483bea4fe3 198 }
aktk 0:cc483bea4fe3 199 printf("Response to Request has done\r\n");
aktk 0:cc483bea4fe3 200 }
aktk 0:cc483bea4fe3 201 printf("close connection.\r\ntcp server is listening...\r\n");
aktk 0:cc483bea4fe3 202 tcpcon.close();
aktk 0:cc483bea4fe3 203 tcpsvr.close();
aktk 0:cc483bea4fe3 204 led2 = false;
aktk 0:cc483bea4fe3 205 }
aktk 0:cc483bea4fe3 206 led1 = false;
aktk 0:cc483bea4fe3 207 return 0;
aktk 0:cc483bea4fe3 208 }