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@8:b013075de2e4, 2016-11-28 (annotated)

Committer:
aktk
Date:
Mon Nov 28 08:43:26 2016 +0000
Revision:
8:b013075de2e4
Parent:
7:184c6f1ace94
Child:
10:4a48594c2f44
first publish

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aktk 0:cc483bea4fe3 1 #include "HTTP_SERVER.h"
aktk 1:3a1fe94c6e42 2 #include "string"
aktk 8:b013075de2e4 3 #ifndef DEBUG
aktk 0:cc483bea4fe3 4 #define DEBUG
aktk 8:b013075de2e4 5 #endif
aktk 1:3a1fe94c6e42 6
aktk 1:3a1fe94c6e42 7 void DEBUG_PRINT_LINE(const char* arg_line)
aktk 1:3a1fe94c6e42 8 {
aktk 1:3a1fe94c6e42 9 #ifdef DEBUG
aktk 1:3a1fe94c6e42 10 printf("%s",arg_line);
aktk 1:3a1fe94c6e42 11 #endif
aktk 1:3a1fe94c6e42 12 }
aktk 1:3a1fe94c6e42 13
aktk 0:cc483bea4fe3 14 HttpServer::HttpServer()
aktk 0:cc483bea4fe3 15 {
aktk 0:cc483bea4fe3 16 keep_alive = (false);
aktk 0:cc483bea4fe3 17 listening_flag = (false);
aktk 0:cc483bea4fe3 18 req_buf[0] = '\0';
aktk 0:cc483bea4fe3 19 }
aktk 0:cc483bea4fe3 20
aktk 0:cc483bea4fe3 21 HttpServer::~HttpServer()
aktk 0:cc483bea4fe3 22 {
aktk 0:cc483bea4fe3 23 }
aktk 0:cc483bea4fe3 24
aktk 0:cc483bea4fe3 25 bool HttpServer::init()
aktk 0:cc483bea4fe3 26 {
aktk 0:cc483bea4fe3 27
aktk 0:cc483bea4fe3 28 // Ethernet Initialization
aktk 0:cc483bea4fe3 29 if(eth.init()) {
aktk 1:3a1fe94c6e42 30 printf("(HTTP_SERVER) Error!@EthernetInterface::init()\r\n");
aktk 0:cc483bea4fe3 31 return false;
aktk 0:cc483bea4fe3 32 }
aktk 0:cc483bea4fe3 33 // Ethernet Connecting setup
aktk 0:cc483bea4fe3 34 if(eth.connect()) {
aktk 1:3a1fe94c6e42 35 printf("(HTTP_SERVER) Error!@EthernetInterface::connect()\r\n");
aktk 0:cc483bea4fe3 36 return false;
aktk 0:cc483bea4fe3 37 } else {
aktk 1:3a1fe94c6e42 38 printf("(HTTP_SERVER) IP Address is %s\r\n", eth.getIPAddress());
aktk 0:cc483bea4fe3 39 }
aktk 0:cc483bea4fe3 40 // TCP Socket setup
aktk 0:cc483bea4fe3 41 // To open Server-side PORT
aktk 0:cc483bea4fe3 42 if(tcpsvr.bind(TCP_PORT)< 0) {
aktk 1:3a1fe94c6e42 43 printf("(HTTP_SERVER) Error!@TCPSocketServer::bind()\r\n");
aktk 0:cc483bea4fe3 44 return false;
aktk 0:cc483bea4fe3 45 } else {
aktk 1:3a1fe94c6e42 46 printf("(HTTP_SERVER) TCP Server has bounden!\r\n");
aktk 0:cc483bea4fe3 47 }
aktk 0:cc483bea4fe3 48 // Server start listening Request from a web browser.
aktk 0:cc483bea4fe3 49 if(tcpsvr.listen(1) < 0) {
aktk 1:3a1fe94c6e42 50 printf("(HTTP_SERVER) tcp server listen failed.\r\n");
aktk 0:cc483bea4fe3 51 return false;
aktk 0:cc483bea4fe3 52 } else {
aktk 0:cc483bea4fe3 53 listening_flag = true;
aktk 1:3a1fe94c6e42 54 printf("(HTTP_SERVER) tcp server is listening...\r\n");
aktk 0:cc483bea4fe3 55 }
aktk 0:cc483bea4fe3 56
aktk 0:cc483bea4fe3 57 return true;
aktk 0:cc483bea4fe3 58 }
aktk 0:cc483bea4fe3 59
aktk 0:cc483bea4fe3 60 bool HttpServer::run()
aktk 0:cc483bea4fe3 61 {
aktk 0:cc483bea4fe3 62 DigitalOut led1(LED1);
aktk 0:cc483bea4fe3 63 DigitalOut led2(LED1);
aktk 0:cc483bea4fe3 64
aktk 0:cc483bea4fe3 65 while (listening_flag) {
aktk 0:cc483bea4fe3 66 led1 = true;
aktk 0:cc483bea4fe3 67 // blocking mode (never timeout)
aktk 0:cc483bea4fe3 68 // waiting client connection
aktk 1:3a1fe94c6e42 69 printf("(HTTP_SERVER) waiting connection\r\n");
aktk 0:cc483bea4fe3 70 if(tcpsvr.accept(tcpcon) < 0) {
aktk 1:3a1fe94c6e42 71 printf("(HTTP_SERVER) failed to accept connection.\r\n");
aktk 0:cc483bea4fe3 72 return -1;
aktk 0:cc483bea4fe3 73 } else {
aktk 1:3a1fe94c6e42 74 printf("(HTTP_SERVER) connection success!\r\nIP: %s\r\n",tcpcon.get_address());
aktk 0:cc483bea4fe3 75 led2 = true;
aktk 0:cc483bea4fe3 76 }
aktk 1:3a1fe94c6e42 77 // When conected
aktk 0:cc483bea4fe3 78 while(tcpcon.is_connected()) {
aktk 1:3a1fe94c6e42 79 DEBUG_PRINT_LINE("(HTTP_SERVER) connected\r\n");
aktk 1:3a1fe94c6e42 80
aktk 0:cc483bea4fe3 81 char buffer[1024] = {0};
aktk 0:cc483bea4fe3 82 char* httpmethod = NULL;
aktk 0:cc483bea4fe3 83 char* filepath = NULL;
aktk 0:cc483bea4fe3 84 char* http_ver = NULL;
aktk 0:cc483bea4fe3 85 char* header_field_name = NULL;
aktk 0:cc483bea4fe3 86 char* header_field_val = NULL;
aktk 1:3a1fe94c6e42 87
aktk 0:cc483bea4fe3 88 //
aktk 0:cc483bea4fe3 89 // Request Analysis
aktk 0:cc483bea4fe3 90 //
aktk 1:3a1fe94c6e42 91 DEBUG_PRINT_LINE("(HTTP_SERVER) DEBUG MODE\r\n");
aktk 0:cc483bea4fe3 92 switch(tcpcon.receive(buffer, 1023)) {
aktk 0:cc483bea4fe3 93 case 0:
aktk 1:3a1fe94c6e42 94 printf("(HTTP_SERVER) recieved buffer is empty.\r\n");
aktk 0:cc483bea4fe3 95 msger.setStatusLine(400, "No Request");
aktk 6:4eb469f51570 96 if(msger.setHeaderField("Connection", "Close"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 0:cc483bea4fe3 97 httpmethod = NULL;
aktk 0:cc483bea4fe3 98 filepath = NULL;
aktk 0:cc483bea4fe3 99 http_ver = NULL;
aktk 0:cc483bea4fe3 100 break;
aktk 0:cc483bea4fe3 101 case -1:
aktk 1:3a1fe94c6e42 102 printf("(HTTP_SERVER) failed to read data from client.\r\n");
aktk 0:cc483bea4fe3 103 msger.setStatusLine(500, "Internal Server Error");
aktk 6:4eb469f51570 104 if(msger.setHeaderField("Connection", "Close"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 0:cc483bea4fe3 105 httpmethod = NULL;
aktk 0:cc483bea4fe3 106 filepath = NULL;
aktk 0:cc483bea4fe3 107 http_ver = NULL;
aktk 0:cc483bea4fe3 108 break;
aktk 0:cc483bea4fe3 109 default:
aktk 1:3a1fe94c6e42 110 printf("(HTTP_SERVER) Recieved Data: %d\r\n-->\r\n%.*s[End of Request]\r\n",strlen(buffer),strlen(buffer),buffer);
aktk 0:cc483bea4fe3 111 // get HTTP method
aktk 0:cc483bea4fe3 112 httpmethod = strtok(buffer," ");
aktk 0:cc483bea4fe3 113 // get File path
aktk 0:cc483bea4fe3 114 filepath = strtok(NULL, " ");
aktk 0:cc483bea4fe3 115 // get HTTP version
aktk 0:cc483bea4fe3 116 http_ver = strtok(NULL, "\r\n");
aktk 0:cc483bea4fe3 117 #ifdef DEBUG
aktk 1:3a1fe94c6e42 118 printf("(HTTP_SERVER) httpmethod: %s\r\n", httpmethod);
aktk 1:3a1fe94c6e42 119 printf("(HTTP_SERVER) file path: %s\r\n", filepath);
aktk 1:3a1fe94c6e42 120 printf("(HTTP_SERVER) http ver : %s\r\n", http_ver);
aktk 0:cc483bea4fe3 121 #endif
aktk 0:cc483bea4fe3 122 break;
aktk 0:cc483bea4fe3 123 }
aktk 1:3a1fe94c6e42 124 DEBUG_PRINT_LINE("\r\n"
aktk 1:3a1fe94c6e42 125 "(HTTP_SERVER) debug before response\r\n");
aktk 1:3a1fe94c6e42 126
aktk 0:cc483bea4fe3 127 //
aktk 0:cc483bea4fe3 128 // Response
aktk 0:cc483bea4fe3 129 //
aktk 0:cc483bea4fe3 130 if (strcmp(httpmethod,"GET") == 0 ) {
aktk 1:3a1fe94c6e42 131 printf("(HTTP_SERVER) GET request incomming.\r\n");
aktk 0:cc483bea4fe3 132
aktk 0:cc483bea4fe3 133 // file calibration
aktk 1:3a1fe94c6e42 134 DEBUG_PRINT_LINE("(HTTP_SERVER) file opening\r\n");
aktk 0:cc483bea4fe3 135 fhandl.open(filepath,"rb");
aktk 0:cc483bea4fe3 136 if(fhandl.arrival()) {
aktk 0:cc483bea4fe3 137 msger.setStatusLine(200, "OK");
aktk 5:dedbaa9c633b 138 if(msger.setHeaderField("Content-Length", fhandl.getFileSize()))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 5:dedbaa9c633b 139 if(msger.setHeaderField("Connection", "keep-alive"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 0:cc483bea4fe3 140 } else {
aktk 5:dedbaa9c633b 141 if(msger.setStatusLine(404, "NOT FOUND"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 7:184c6f1ace94 142 if(msger.setHeaderField("Connection", "Close"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 1:3a1fe94c6e42 143 DEBUG_PRINT_LINE("(HTTP_SERVER) NOT FOUND\r\n");
aktk 0:cc483bea4fe3 144 }
aktk 7:184c6f1ace94 145 if( !strcmp(fhandl.getSuffix(), "htm" ) ||
aktk 7:184c6f1ace94 146 !strcmp(fhandl.getSuffix(), "HTM" ) ||
aktk 7:184c6f1ace94 147 !strcmp(fhandl.getSuffix(), "html") ||
aktk 7:184c6f1ace94 148 !strcmp(fhandl.getSuffix(), "HTML")) {
aktk 5:dedbaa9c633b 149 if(msger.setHeaderField("Content-Type", "text/html"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 7:184c6f1ace94 150 } else if(!strcmp(fhandl.getSuffix(), "js" )){
aktk 7:184c6f1ace94 151 if(msger.setHeaderField("Content-Type", "text/javascript"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 7:184c6f1ace94 152 } else if (!strcmp(fhandl.getSuffix(), "ico" ) ) {
aktk 5:dedbaa9c633b 153 if(msger.setHeaderField("Content-Type", "image/png"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 0:cc483bea4fe3 154 } else {
aktk 0:cc483bea4fe3 155 msger.setStatusLine(406, "not acceptable");
aktk 0:cc483bea4fe3 156 }
aktk 0:cc483bea4fe3 157
aktk 0:cc483bea4fe3 158 // Connection timeout field
aktk 5:dedbaa9c633b 159 if(msger.setHeaderField("Keep-Alive", "timeouit=15"))printf("(HTTP_SERVER)buffer over flow @ ResponseMessenger");
aktk 1:3a1fe94c6e42 160
aktk 0:cc483bea4fe3 161 // send response
aktk 0:cc483bea4fe3 162 msger.sendHTTPResponse(tcpcon, fhandl);
aktk 0:cc483bea4fe3 163
aktk 0:cc483bea4fe3 164 //file close
aktk 7:184c6f1ace94 165 if( fhandl.close()== 0)
aktk 7:184c6f1ace94 166 DEBUG_PRINT_LINE("(HTTP_SERVER) file has closed\r\n");
aktk 0:cc483bea4fe3 167 else if(EOF)
aktk 7:184c6f1ace94 168 DEBUG_PRINT_LINE("(HTTP_SERVER) failed to close the file\r\n");
aktk 7:184c6f1ace94 169
aktk 7:184c6f1ace94 170 msger.resetHeader();
aktk 7:184c6f1ace94 171 printf("(HTTP_SERVER) echo back done.\r\n");
aktk 7:184c6f1ace94 172 }
aktk 7:184c6f1ace94 173 if (httpmethod == NULL) {
aktk 7:184c6f1ace94 174 msger.sendHTTPResponse(tcpcon);
aktk 0:cc483bea4fe3 175 msger.resetHeader();
aktk 1:3a1fe94c6e42 176 printf("(HTTP_SERVER) echo back done.\r\n");
aktk 0:cc483bea4fe3 177 }
aktk 1:3a1fe94c6e42 178 printf("(HTTP_SERVER) Response to Request has done\r\n");
aktk 7:184c6f1ace94 179 //
aktk 7:184c6f1ace94 180 //
aktk 7:184c6f1ace94 181 //
aktk 0:cc483bea4fe3 182 }
aktk 1:3a1fe94c6e42 183 printf("(HTTP_SERVER) close connection.\r\ntcp server is listening...\r\n");
aktk 0:cc483bea4fe3 184 tcpcon.close();
aktk 0:cc483bea4fe3 185 led2 = false;
aktk 0:cc483bea4fe3 186 }
aktk 7:184c6f1ace94 187 tcpsvr.close();
aktk 7:184c6f1ace94 188 listening_flag = false;
aktk 0:cc483bea4fe3 189 led1 = false;
aktk 0:cc483bea4fe3 190 return 0;
aktk 0:cc483bea4fe3 191 }