Can`t acces index.htm from sdhc card on shield ethernet

Can`t acces index.htm from sdhc card on shield ethernet.
my code is from Displaying a Web Page with Image using the Arduino Ethernet Shield and SD Card

Here is the output on serial monitor after i upload the code. On webpage is showing nothing.

Initializing SD card...
SUCCESS - SD card initialized.
SUCCESS - Found index.htm file.
GET / HTTP/1.1
Host: 192.168.0.177
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0

Here is the output from CardInfo code.

Initializing SD card...Wiring is correct and a card is present.

Card type:         SDHC
Clusters:          986368
Blocks x Cluster:  8
Total Blocks:      7890944

Volume type is:    FAT32
Volume size (Kb):  3945472
Volume size (Mb):  3853
Volume size (Gb):  3.76

Files found on the card (name, date and size in bytes): 
SYSTEM~1/     2019-06-17 21:36:34
  INDEXE~1      2019-06-17 21:36:34 76
  WPSETT~1.DAT  2019-06-17 21:36:34 12
INDEX.HTM     2013-03-27 19:00:36 10700
WEBPAGE/      2019-06-17 21:25:14
  INDEX.HTM     2013-03-27 19:00:36 10700

Can someone help me with this? Thank you

Can someone help me with this?

Some code you didn't post generated some output. But, you want us to help you fix the code.

Sure thing. My crystal ball is due back from the cleaners about the 12th of Never. I'll have a look at your code then.

Here is the code, sorry!

#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>

// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ   20

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 20); // IP address, may need to change depending on network
EthernetServer server(80);  // create a server at port 80
File webFile;
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0;              // index into HTTP_req buffer

void setup()
{
    // disable Ethernet chip
    pinMode(10, OUTPUT);
    digitalWrite(10, HIGH);
    
    Serial.begin(9600);       // for debugging
    
    // initialize SD card
    Serial.println("Initializing SD card...");
    if (!SD.begin(4)) {
        Serial.println("ERROR - SD card initialization failed!");
        return;    // init failed
    }
    Serial.println("SUCCESS - SD card initialized.");
    // check for index.htm file
    if (!SD.exists("index.htm")) {
        Serial.println("ERROR - Can't find index.htm file!");
        return;  // can't find index file
    }
    Serial.println("SUCCESS - Found index.htm file.");
    
    Ethernet.begin(mac, ip);  // initialize Ethernet device
    server.begin();           // start to listen for clients
}

void loop()
{
    EthernetClient client = server.available();  // try to get client

    if (client) {  // got client?
        boolean currentLineIsBlank = true;
        while (client.connected()) {
            if (client.available()) {   // client data available to read
                char c = client.read(); // read 1 byte (character) from client
                // buffer first part of HTTP request in HTTP_req array (string)
                // leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
                if (req_index < (REQ_BUF_SZ - 1)) {
                    HTTP_req[req_index] = c;          // save HTTP request character
                    req_index++;
                }
                // print HTTP request character to serial monitor
                Serial.print(c);
                // last line of client request is blank and ends with \n
                // respond to client only after last line received
                if (c == '\n' && currentLineIsBlank) {
                    // open requested web page file
                    if (StrContains(HTTP_req, "GET / ")
                                 || StrContains(HTTP_req, "GET /index.htm")) {
                        client.println("HTTP/1.1 200 OK");
                        client.println("Content-Type: text/html");
                        client.println("Connnection: close");
                        client.println();
                        webFile = SD.open("index.htm");        // open web page file
                    }
                    else if (StrContains(HTTP_req, "GET /page2.htm")) {
                        client.println("HTTP/1.1 200 OK");
                        client.println("Content-Type: text/html");
                        client.println("Connnection: close");
                        client.println();
                        webFile = SD.open("page2.htm");        // open web page file
                    }
                    else if (StrContains(HTTP_req, "GET /pic.jpg")) {
                        webFile = SD.open("pic.jpg");
                        if (webFile) {
                            client.println("HTTP/1.1 200 OK");
                            client.println();
                        }
                    }
                    if (webFile) {
                        while(webFile.available()) {
                            client.write(webFile.read()); // send web page to client
                        }
                        webFile.close();
                    }
                    // reset buffer index and all buffer elements to 0
                    req_index = 0;
                    StrClear(HTTP_req, REQ_BUF_SZ);
                    break;
                }
                // every line of text received from the client ends with \r\n
                if (c == '\n') {
                    // last character on line of received text
                    // starting new line with next character read
                    currentLineIsBlank = true;
                } 
                else if (c != '\r') {
                    // a text character was received from client
                    currentLineIsBlank = false;
                }
            } // end if (client.available())
        } // end while (client.connected())
        delay(1);      // give the web browser time to receive the data
        client.stop(); // close the connection
    } // end if (client)
}

// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
    for (int i = 0; i < length; i++) {
        str[i] = 0;
    }
}

// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
    char found = 0;
    char index = 0;
    char len;

    len = strlen(str);
    
    if (strlen(sfind) > len) {
        return 0;
    }
    while (index < len) {
        if (str[index] == sfind[found]) {
            found++;
            if (strlen(sfind) == found) {
                return 1;
            }
        }
        else {
            found = 0;
        }
        index++;
    }

    return 0;
}
                    if (webFile) {
                        while(webFile.available()) {
                            client.write(webFile.read()); // send web page to client
                        }
                        webFile.close();
                    }

If the file was opened, read its contents and write to the client.

If the file was not opened, don't tell anyone. Just pretend that it didn't matter.

I think I would like to know if the file couldn't be opened. I think I would like to know if the file was empty, or not. I think I'd like to know what was in the file, if it wasn't empty.

The more data you have, the more successful you are at debugging.

Thank you for your reply, but im too stupid to fix it. Ive tried to implement some code from SD examples (read, write, list files, files ) and it seems that this code can read the file but can`t show it on the web...

I`ve tried to implement some code from SD examples

So, you changed your code, and kept the changes to yourself. Well, I’ll keep my answer to myself, then.

How about after:

                if (c == '\n' && currentLineIsBlank) {
                    // open requested web page file

You insert:

                    Serial.println("Request Received.");

and after:

                    // send web page to client
                    if (webFile) {
                        while(webFile.available()) {
                            client.write(webFile.read());
                        }
                        webFile.close();
                    }

You add:

                    else
                    {
                       Serial.println("404: File Not Found");
                    }

PaulS:
So, you changed your code, and kept the changes to yourself. Well, I’ll keep my answer to myself, then.

Sorry PaulS, i changed the code just to see for myself and then i delete what was new.

johnwasser:
How about after:

                if (c == '\n' && currentLineIsBlank) {

// open requested web page file



You insert:


Serial.println(“Request Received.”);



and after:


// send web page to client
                    if (webFile) {
                        while(webFile.available()) {
                            client.write(webFile.read());
                        }
                        webFile.close();
                    }



You add:


else
                    {
                      Serial.println(“404: File Not Found”);
                    }

Thanks, i uploaded the code like u said, and here is the result

Initializing SD card...
SUCCESS - SD card initialized.
SUCCESS - Found index.htm file.
GET / HTTP/1.1
Host: 192.168.0.177
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0

Request Received.
404: File Not Found
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>

// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ   20

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 177); // IP address, may need to change depending on network
EthernetServer server(80);  // create a server at port 80
File webFile;
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0;              // index into HTTP_req buffer

void setup()
{
    // disable Ethernet chip
    pinMode(10, OUTPUT);
    digitalWrite(10, HIGH);
    
    Serial.begin(9600);       // for debugging
    
    // initialize SD card
    Serial.println(F("Initializing SD card..."));
    if (!SD.begin(4)) {
        Serial.println(F("ERROR - SD card initialization failed!"));
        return;    // init failed
    }
    Serial.println(F("SUCCESS - SD card initialized."));
    // check for index.htm file
    if (!SD.exists("index.htm")) {
        Serial.println(F("ERROR - Can't find index.htm file!"));
        return;  // can't find index file
    }
    Serial.println(F("SUCCESS - Found index.htm file."));
    
    Ethernet.begin(mac, ip);  // initialize Ethernet device
    server.begin();           // start to listen for clients
}

void loop()
{
    EthernetClient client = server.available();  // try to get client

    if (client) {  // got client?
        boolean currentLineIsBlank = true;
        while (client.connected()) {
            if (client.available()) {   // client data available to read
                char c = client.read(); // read 1 byte (character) from client
                // buffer first part of HTTP request in HTTP_req array (string)
                // leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
                if (req_index < (REQ_BUF_SZ - 1)) {
                    HTTP_req[req_index] = c;          // save HTTP request character
                    req_index++;
                }
                // print HTTP request character to serial monitor
                Serial.print(c);
                // last line of client request is blank and ends with \n
                // respond to client only after last line received
                if (c == '\n' && currentLineIsBlank) {
                  Serial.println("Request Received.");
                    // open requested web page file
                    if (StrContains(HTTP_req, "GET / ")
                                 || StrContains(HTTP_req, "GET /index.htm")) {
                        client.println("HTTP/1.1 200 OK");
                        client.println("Content-Type: text/html");
                        client.println("Connnection: close");
                        client.println();
                        webFile = SD.open("index.htm");        // open web page file
                    }
                    else if (StrContains(HTTP_req, "GET /page2.htm")) {
                        client.println("HTTP/1.1 200 OK");
                        client.println("Content-Type: text/html");
                        client.println("Connnection: close");
                        client.println();
                        webFile = SD.open("page2.htm");        // open web page file
                    }
                    else if (StrContains(HTTP_req, "GET /pic.jpg")) {
                        webFile = SD.open("pic.jpg");
                        if (webFile) {
                            client.println("HTTP/1.1 200 OK");
                            client.println();
                        }
                    }

                     if (webFile) {
                     while(webFile.available()) {
                     client.write(webFile.read()); // send web page to client                    
                     }
                   
                     webFile.close();
                     }
                    else
                    {
                       Serial.println("404: File Not Found");
                    }

                    // reset buffer index and all buffer elements to 0
                    req_index = 0;
                    StrClear(HTTP_req, REQ_BUF_SZ);
                    break;
                }
                // every line of text received from the client ends with \r\n
                if (c == '\n') {
                    // last character on line of received text
                    // starting new line with next character read
                    currentLineIsBlank = true;
                } 
                else if (c != '\r') {
                    // a text character was received from client
                    currentLineIsBlank = false;
                }
            } // end if (client.available())
        } // end while (client.connected())
        delay(1);      // give the web browser time to receive the data
        client.stop(); // close the connection
    } // end if (client)
}

// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
    for (int i = 0; i < length; i++) {
        str[i] = 0;
    }
}

// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
    char found = 0;
    char index = 0;
    char len;

    len = strlen(str);
    
    if (strlen(sfind) > len) {
        return 0;
    }
    while (index < len) {
        if (str[index] == sfind[found]) {
            found++;
            if (strlen(sfind) == found) {
                return 1;
            }
        }
        else {
            found = 0;
        }
        index++;
    }

    return 0;
}

Very strange. It appears that even though you were able to determine that the file “index.htm” exists, you were not able to open the file “index.htm”.

johnwasser:
Very strange. It appears that even though you were able to determine that the file "index.htm" exists, you were not able to open the file "index.htm".

Yes it is strange and i dont know what to do. I need this program to work. If anyone can help me please do it

I suspect the request matching

Juraj:
I suspect the request matching

Me, too. That was why I suggested printing the request (between delimiters) AND the fact that the block that was to open the file was even entered.

up anyone!! :o

valyHQ:
up anyone!! :o

what?
I wrote "I suspect the request matching"
so add debug print into
if (StrContains(HTTP_req, "GET / ") || StrContains(HTTP_req, "GET /index.htm")) {