Webserver and html file

Projects Programming
6

Thanks, it is working almost fine, following the code:

char buffer[500];
int charCnt;

file.open(&root, "arduino.htm", O_READ);
while ((charCnt = file.read(buffer, 499)) > 0) {
   buffer[charCnt] = '\0';
   client.write(buffer);
}

I also changed the sketch to another that fill the memory for 23000 bytes compared with previous of 29000.
I used the sketch in this page Arduino Tutorials - Ethernet+SD, but I'm experiencing an issue when I have to respond a request of json string, I post the code:

#include "SPI.h"
#include "Ethernet.h"
#include "SD.h"

#define NAMELEN 32
#define VALUELEN 32

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 1, 210 };
EthernetServer server(80);

char buffer[500];
int charCnt;

Sd2Card card;
SdVolume volume;
SdFile root;
SdFile file;

typedef enum URLPARAM_RESULT { URLPARAM_OK, URLPARAM_NAME_OFLO, URLPARAM_VALUE_OFLO, URLPARAM_BOTH_OFLO,URLPARAM_EOS };

// store error strings in flash to save RAM
#define error(s) error_P(PSTR(s))

void setup() {
  Serial.begin(9600);
 
  PgmPrint("Free RAM: ");
  Serial.println(FreeRam());  
  
  // initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
  // breadboards.  use SPI_FULL_SPEED for better performance.
  pinMode(10, OUTPUT);                       // set the SS pin as an output (necessary!)
  digitalWrite(10, HIGH);                    // but turn off the W5100 chip!

  if (!card.init(SPI_HALF_SPEED, 4)) error("card.init failed!");
  
  // initialize a FAT volume
  if (!volume.init(&card)) error("vol.init failed!");

  PgmPrint("Volume is FAT");
  Serial.println(volume.fatType(),DEC);
  Serial.println();
  
  if (!root.openRoot(&volume)) error("openRoot failed");

  // list file in root with date and size
  PgmPrintln("Files found in root:");
  root.ls(LS_DATE | LS_SIZE);
  Serial.println();
  
  // Recursive list of all directories
  PgmPrintln("Files found in all dirs:");
  root.ls(LS_R);
  
  Serial.println();
  PgmPrintln("Done");
  
  // Debugging complete, we start the server!
  Ethernet.begin(mac, ip);
  server.begin();
}

void loop()
{
  char clientline[BUFSIZ];
  int index = 0;
  char name[NAMELEN];
  char value[VALUELEN];  

  EthernetClient client = server.available();
  if (client) {
    // an http request ends with a blank line
    boolean current_line_is_blank = true;
    
    // reset the input buffer
    index = 0;
    
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        
        // If it isn't a new line, add the character to the buffer
        if (c != '\n' && c != '\r') {
          clientline[index] = c;
          index++;
          // are we too big for the buffer? start tossing out data
          if (index >= BUFSIZ) 
            index = BUFSIZ -1;
          
          // continue to read more data!
          continue;
        }
        
        // got a \n or \r new line, which means the string is done
        clientline[index] = 0;
        
        // Print it out for debugging
        //Serial.println(clientline);
        
        // Look for substring such as a request to get the root file
        if (strstr(clientline, "GET / ") != 0) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          file.open(&root, "arduino.htm", O_READ);
          while ((charCnt = file.read(buffer, 499)) > 0) {
              // uncomment the serial to debug (slow!)
              //Serial.print((char)c);
              buffer[charCnt] = '\0';
              client.write(buffer);
          }
          file.close();
        } else if (strstr(clientline, "GET /") != 0) {
            char *filename;
            char *url_param;
            
            url_param = strstr (clientline,"?") + 1;
            (strstr(url_param, " HTTP"))[0] = 0;
//            filename = clientline + 16; 
//            (strstr(clientline, " HTTP"))[0] = 0;
            
            int rc;
            char parametri[4];
            if (strlen(url_param))  
            {
              int j = 0;
              while (strlen(url_param))
              {
                rc = decodeURLparam(&url_param, name, NAMELEN, value, VALUELEN);
                if (rc != 0)  
                {
                  parametri[j] = value[0];
                  j = j + 1;
                }
              }
            }
            writeIO(parametri[0], (int)parametri[1], (int)parametri[2]);
            
**********| THIS PART SEEMS TO HAVE SOME PROBLEM |**********************
            //client.println("HTTP/1.1 200 OK");
            //client.println("Content-Type: text/html");
            //client.println();
            client.println("{di:[{pin:2,v:0},{pin:3,v:1},{pin:4,v:1}]}");
*************************************************************
        } else {
          // everything else is a 404
          client.println("HTTP/1.1 404 Not Found");
          client.println("Content-Type: text/html");
          client.println();
          client.println("<h2>File Not Found!</h2>");
        }
        break;
      }
    }
    // give the web browser time to receive the data
    delay(1);
    client.stop();
  }
}

When I request the page by browser I receive the right response, but from an AJAX call ajax script cannot connect to that page. If I copy the page content in a text file and try from ajax to connect is working fine. In my opinion the content type of the response should be configured properly but if I remove the comments from the following lines

          lient.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");

and I try to connect by browser I don't receive anything, blank page.
I tryed to change the content-type (text/html, text/json, application/json, text/plain), nothing change.