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>

handlers/ResponseMessenger.cpp@2:33714d7c0f45, 2016-11-26 (annotated)

Committer:
aktk
Date:
Sat Nov 26 18:06:53 2016 +0000
Revision:
2:33714d7c0f45
Parent:
1:3a1fe94c6e42
Child:
3:59884bc0a238
attempting to notice the request to upgrade it to websocket.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aktk 0:cc483bea4fe3 1 #include "ResponseMessenger.h"
aktk 0:cc483bea4fe3 2
aktk 0:cc483bea4fe3 3 const char ResponseMessenger::http_ver[9] = "HTTP/1.1";
aktk 0:cc483bea4fe3 4 ResponseMessenger::ResponseMessenger()
aktk 0:cc483bea4fe3 5 {
aktk 0:cc483bea4fe3 6 // Status-Line
aktk 0:cc483bea4fe3 7 status_code = 0;
aktk 0:cc483bea4fe3 8 reason_phrase[0] = '\0';
aktk 0:cc483bea4fe3 9 header_field_buffer[0]='\0';
aktk 0:cc483bea4fe3 10 // Response Header
aktk 0:cc483bea4fe3 11 }
aktk 0:cc483bea4fe3 12 ResponseMessenger::~ResponseMessenger()
aktk 0:cc483bea4fe3 13 {
aktk 0:cc483bea4fe3 14 }
aktk 0:cc483bea4fe3 15 int ResponseMessenger::resetHeader()
aktk 0:cc483bea4fe3 16 {
aktk 0:cc483bea4fe3 17 // Status-Line
aktk 0:cc483bea4fe3 18 status_code = 0;
aktk 0:cc483bea4fe3 19 reason_phrase[0] = '\0';
aktk 2:33714d7c0f45 20 // Response Header
aktk 0:cc483bea4fe3 21 header_field_buffer[0]='\0';
aktk 0:cc483bea4fe3 22 return 0;
aktk 0:cc483bea4fe3 23 }
aktk 0:cc483bea4fe3 24 int ResponseMessenger::setStatusLine(
aktk 0:cc483bea4fe3 25 int arg_status_code,
aktk 0:cc483bea4fe3 26 const char* arg_reason_phrase
aktk 0:cc483bea4fe3 27 )
aktk 0:cc483bea4fe3 28 {
aktk 0:cc483bea4fe3 29 status_code = arg_status_code;
aktk 0:cc483bea4fe3 30 strcpy(reason_phrase, arg_reason_phrase);
aktk 0:cc483bea4fe3 31
aktk 0:cc483bea4fe3 32 // To be safe on the sage side
aktk 0:cc483bea4fe3 33 reason_phrase[REASON_PHRASE_SIZE - 1] = '\0';
aktk 0:cc483bea4fe3 34 // Send 0 if arg str size is too big, else -1.
aktk 0:cc483bea4fe3 35 if (strlen(arg_reason_phrase) < REASON_PHRASE_SIZE)
aktk 0:cc483bea4fe3 36 return 0;
aktk 0:cc483bea4fe3 37 else
aktk 0:cc483bea4fe3 38 return -1;
aktk 0:cc483bea4fe3 39 }
aktk 0:cc483bea4fe3 40
aktk 0:cc483bea4fe3 41 int ResponseMessenger::setHeaderField(
aktk 0:cc483bea4fe3 42 const char* arg_field_name, const char* arg_field_val)
aktk 0:cc483bea4fe3 43 {
aktk 0:cc483bea4fe3 44 const int nField = 4;
aktk 0:cc483bea4fe3 45 char registered_field_name[nField][32]= {
aktk 0:cc483bea4fe3 46 "Connection",
aktk 0:cc483bea4fe3 47 "Location",
aktk 0:cc483bea4fe3 48 "Keep-Alive",
aktk 0:cc483bea4fe3 49 "Content-Type"
aktk 0:cc483bea4fe3 50 };
aktk 0:cc483bea4fe3 51 bool flag = false;
aktk 0:cc483bea4fe3 52 char header_field_line_buffer[128];
aktk 0:cc483bea4fe3 53 int buffer_size = strlen(header_field_buffer);
aktk 0:cc483bea4fe3 54
aktk 0:cc483bea4fe3 55 for (int i = 0; i < nField; i++) {
aktk 0:cc483bea4fe3 56 if(strcmp(arg_field_name, registered_field_name[i]) == 0)
aktk 0:cc483bea4fe3 57 flag = true;
aktk 0:cc483bea4fe3 58 }
aktk 0:cc483bea4fe3 59 if(flag) {
aktk 0:cc483bea4fe3 60 sprintf(header_field_line_buffer, "%s: %s\r\n", arg_field_name, arg_field_val);
aktk 0:cc483bea4fe3 61 strcat(header_field_buffer, header_field_line_buffer);
aktk 0:cc483bea4fe3 62 printf("header field: \r\n%s\r\n", header_field_buffer);
aktk 0:cc483bea4fe3 63 }
aktk 0:cc483bea4fe3 64 // To be safe on the sage side
aktk 0:cc483bea4fe3 65 header_field_buffer[HEADER_FIELDS_SIZE - 1] = '\0';
aktk 0:cc483bea4fe3 66 // Send 0 if arg str size is too big, else -1.
aktk 0:cc483bea4fe3 67 if (buffer_size + strlen(arg_field_name) + strlen(arg_field_val) < HEADER_FIELDS_SIZE + 1)
aktk 0:cc483bea4fe3 68 return 0;
aktk 0:cc483bea4fe3 69 else
aktk 0:cc483bea4fe3 70 return -1;
aktk 0:cc483bea4fe3 71 }
aktk 0:cc483bea4fe3 72
aktk 0:cc483bea4fe3 73 int ResponseMessenger::setHeaderField(
aktk 0:cc483bea4fe3 74 const char* arg_field_name, int arg_field_val)
aktk 0:cc483bea4fe3 75 {
aktk 0:cc483bea4fe3 76 const int nField = 1;
aktk 0:cc483bea4fe3 77 char registered_field_name[nField][32]= {
aktk 0:cc483bea4fe3 78 "Content-Length"
aktk 0:cc483bea4fe3 79 };
aktk 0:cc483bea4fe3 80 bool flag = false;
aktk 0:cc483bea4fe3 81 char header_field_line_buffer[128];
aktk 0:cc483bea4fe3 82 int buffer_size = strlen(header_field_buffer);
aktk 0:cc483bea4fe3 83
aktk 0:cc483bea4fe3 84 for (int i = 0; i < nField; i++) {
aktk 0:cc483bea4fe3 85 if(strcmp(arg_field_name, registered_field_name[i]) == 0)
aktk 0:cc483bea4fe3 86 flag = true;
aktk 0:cc483bea4fe3 87 }
aktk 0:cc483bea4fe3 88 if(flag) {
aktk 0:cc483bea4fe3 89 sprintf(header_field_line_buffer, "%s: %d\r\n", arg_field_name, arg_field_val);
aktk 0:cc483bea4fe3 90 strcat(header_field_buffer, header_field_line_buffer);
aktk 0:cc483bea4fe3 91 printf("header field: \r\n%s\r\n", header_field_buffer);
aktk 0:cc483bea4fe3 92 }
aktk 0:cc483bea4fe3 93 // To be safe on the sage side
aktk 0:cc483bea4fe3 94 header_field_buffer[HEADER_FIELDS_SIZE - 1] = '\0';
aktk 0:cc483bea4fe3 95 // Send 0 if arg str size is too big, else -1.
aktk 0:cc483bea4fe3 96 if (buffer_size + strlen(arg_field_name) + 10 < HEADER_FIELDS_SIZE + 1)
aktk 0:cc483bea4fe3 97 return 0;
aktk 0:cc483bea4fe3 98 else
aktk 0:cc483bea4fe3 99 return -1;
aktk 0:cc483bea4fe3 100 }
aktk 1:3a1fe94c6e42 101
aktk 1:3a1fe94c6e42 102 int ResponseMessenger::rmHeaderField(
aktk 1:3a1fe94c6e42 103 const char* arg_field_name)
aktk 1:3a1fe94c6e42 104 {
aktk 1:3a1fe94c6e42 105 char* removedLineHead;
aktk 1:3a1fe94c6e42 106 char* removedLineEnd;
aktk 1:3a1fe94c6e42 107 int buffer_size;
aktk 1:3a1fe94c6e42 108
aktk 1:3a1fe94c6e42 109 // Look for the head of the line to want to remove
aktk 1:3a1fe94c6e42 110 removedLineHead = strstr(header_field_buffer, arg_field_name);
aktk 1:3a1fe94c6e42 111 if(removedLineHead = NULL) return -1;
aktk 1:3a1fe94c6e42 112 // Look for the first "\r\n" which is the end of the line
aktk 1:3a1fe94c6e42 113 removedLineEnd = strstr(removedLineHead, "\r\n");
aktk 1:3a1fe94c6e42 114 removedLineEnd += 3; //pointing next line head or '\0' if the line of the last one.
aktk 1:3a1fe94c6e42 115 buffer_size = strlen(removedLineEnd);
aktk 1:3a1fe94c6e42 116
aktk 1:3a1fe94c6e42 117 for(int i = 0; i < buffer_size + 1; i++)
aktk 1:3a1fe94c6e42 118 removedLineHead[i] = removedLineEnd[i];
aktk 1:3a1fe94c6e42 119
aktk 1:3a1fe94c6e42 120 return 0;
aktk 1:3a1fe94c6e42 121 }
aktk 1:3a1fe94c6e42 122
aktk 0:cc483bea4fe3 123 int ResponseMessenger::getStatusCode()
aktk 0:cc483bea4fe3 124 {
aktk 0:cc483bea4fe3 125 return status_code;
aktk 0:cc483bea4fe3 126 }
aktk 0:cc483bea4fe3 127
aktk 0:cc483bea4fe3 128 char ResponseMessenger::sendHTTPResponse(
aktk 0:cc483bea4fe3 129 TCPSocketConnection &arg_connection)
aktk 0:cc483bea4fe3 130 {
aktk 0:cc483bea4fe3 131 int err_log = 0;
aktk 0:cc483bea4fe3 132 int err_code = 0;
aktk 0:cc483bea4fe3 133 enum {
aktk 0:cc483bea4fe3 134 MAX_BUFFER_SIZE = 1024
aktk 0:cc483bea4fe3 135 };
aktk 0:cc483bea4fe3 136 char buffer[MAX_BUFFER_SIZE] = "\0";
aktk 0:cc483bea4fe3 137
aktk 0:cc483bea4fe3 138 //
aktk 0:cc483bea4fe3 139 // Header
aktk 0:cc483bea4fe3 140 //
aktk 0:cc483bea4fe3 141 printf("[send]Header\r\n");
aktk 0:cc483bea4fe3 142 // Status Line
aktk 0:cc483bea4fe3 143 sprintf(buffer, "%s %d %s\r\n", http_ver, status_code, reason_phrase);
aktk 0:cc483bea4fe3 144 buffer[MAX_BUFFER_SIZE - 1] = '\0';
aktk 0:cc483bea4fe3 145 err_log = arg_connection.send_all(buffer, strlen(buffer));
aktk 0:cc483bea4fe3 146 if(err_log < 0) err_code = ((err_code << 1) | 1);
aktk 0:cc483bea4fe3 147 // Response Header
aktk 0:cc483bea4fe3 148 err_log = arg_connection.send_all(header_field_buffer, strlen(header_field_buffer));
aktk 0:cc483bea4fe3 149 if(err_log < 0) err_code = ((err_code << 1) | 1);
aktk 0:cc483bea4fe3 150 // Blank line
aktk 0:cc483bea4fe3 151 err_log = arg_connection.send_all("\r\n", strlen("\r\n"));
aktk 0:cc483bea4fe3 152 if(err_log < 0) err_code = ((err_code << 1) | 1);
aktk 0:cc483bea4fe3 153 printf("[Header has sent]\r\n");
aktk 0:cc483bea4fe3 154 //return error code
aktk 0:cc483bea4fe3 155 return err_code << 2;
aktk 0:cc483bea4fe3 156
aktk 0:cc483bea4fe3 157 }
aktk 0:cc483bea4fe3 158
aktk 0:cc483bea4fe3 159 char ResponseMessenger::sendHTTPResponse(
aktk 0:cc483bea4fe3 160 TCPSocketConnection &arg_connection,
aktk 0:cc483bea4fe3 161 FileHandler &arg_file)
aktk 0:cc483bea4fe3 162 {
aktk 0:cc483bea4fe3 163 int err_log = 0;
aktk 0:cc483bea4fe3 164 int err_code = 0;
aktk 0:cc483bea4fe3 165 enum {
aktk 0:cc483bea4fe3 166 MAX_BUFFER_SIZE = 1024
aktk 0:cc483bea4fe3 167 };
aktk 0:cc483bea4fe3 168 signed char buffer[MAX_BUFFER_SIZE];
aktk 0:cc483bea4fe3 169
aktk 0:cc483bea4fe3 170 //
aktk 0:cc483bea4fe3 171 // Header
aktk 0:cc483bea4fe3 172 //
aktk 0:cc483bea4fe3 173 err_code = sendHTTPResponse(arg_connection);
aktk 0:cc483bea4fe3 174 //
aktk 0:cc483bea4fe3 175 // Body
aktk 0:cc483bea4fe3 176 //
aktk 0:cc483bea4fe3 177 if (arg_file.arrival() && status_code == 200) {
aktk 0:cc483bea4fe3 178 printf("[send]Body\r\n");
aktk 0:cc483bea4fe3 179 do {
aktk 0:cc483bea4fe3 180 int i = 0;
aktk 0:cc483bea4fe3 181 do {
aktk 0:cc483bea4fe3 182 buffer[i++] = arg_file.getc();//return a byte from file ponter, or -1 if EOF or ERROR
aktk 0:cc483bea4fe3 183 } while ((i < MAX_BUFFER_SIZE - 1) && (buffer[i - 1] != EOF));
aktk 0:cc483bea4fe3 184 if(buffer[i - 1] == EOF)buffer[i - 1] = '\0';
aktk 0:cc483bea4fe3 185 buffer[i] = '\0';
aktk 0:cc483bea4fe3 186 if (!arg_file.hasError()) {
aktk 0:cc483bea4fe3 187 err_log = arg_connection.send_all((char*)buffer, i);
aktk 0:cc483bea4fe3 188 //printf("buffer log: %s", buffer);
aktk 0:cc483bea4fe3 189 }
aktk 0:cc483bea4fe3 190 if (arg_file.hasError()) printf("\r\n[ERR][ERR][ERR]\r\n");
aktk 0:cc483bea4fe3 191 if (arg_file.atEOF()) printf("\r\n[EOF][EOF][EOF]\r\n");
aktk 0:cc483bea4fe3 192 } while (!arg_file.atEOF() && !arg_file.hasError());
aktk 0:cc483bea4fe3 193 printf("[Body has sent]\r\n");
aktk 0:cc483bea4fe3 194
aktk 0:cc483bea4fe3 195 if (err_log < 0) err_code = ((err_code) | 2);
aktk 0:cc483bea4fe3 196 if (!arg_file.hasError())err_code = ((err_code) | 1);
aktk 1:3a1fe94c6e42 197 } else {
aktk 0:cc483bea4fe3 198 printf("[No Body]\r\n");
aktk 0:cc483bea4fe3 199 }
aktk 0:cc483bea4fe3 200 return (char)err_code;
aktk 0:cc483bea4fe3 201 }