[UE] Exact data not getting on the browser

Hi All,

Iam currently working on lighttpd with fast cgi support.When I send the data to browser, it contains all the data including printf , ELF etc as shown in attached image lighttpd-fastcgi.JPG

Added mod_fastcgi in lighttpd.conf file

server.modules += (
    "mod_compress",
    "mod_dirlisting",
    "mod_fastcgi",
    "mod_staticfile",
)

Installed below packages:
sudo apt install lighttpd
sudo apt-get install libfcgi-dev

My C code is as below

int main() {
    while (FCGI_Accept() >= 0) {
        char* content = getenv("QUERY_STRING");
        printf("#########################################\n");
        if (content != NULL) {
            double number;
            if (sscanf(content, "number=%lf", &number) == 1) {
                double square = number * number;
                printf("square11111111111 = %d\n",square);
                printf("Content-type: text/plain\r\n\r\n%.2f", square);
            }
        }
    }
    return 0;
}

My HTML code is as below

<!DOCTYPE html>
<html>
<head>
    <title>Square Calculator</title>
</head>
<body>
    <h1>Calculate the Square of a Number</h1>
    <p>Enter a number: <input type="text" id="numberInput"></p>
    <button onclick="calculateSquare()">Calculate</button>
    <p>Square: <span id="squareValue"></span></p>

    <script>
        function calculateSquare() {
            const number = document.getElementById("numberInput").value;
            fetch('/square_cgi?number=' + number)
                .then(response => response.text())
                .then(data => {
                    document.getElementById("squareValue").textContent = data;
                });
        }
    </script>
</body>
</html>

Please let me know How I ca only get square value on the browswer instead of all html data.

Replies (3)

RE: Exact data not getting on the browser - Added by gstrauss about 1 month ago

Please refer to the documentation: mod_fastcgi
You need to configure mod_fastcgi to execute your code. Loading "mod_fastcgi" in server.modules is only the first step.

RE: Exact data not getting on the browser - Added by syedr1 about 1 month ago

Hi gstrauss

After modifying the lighttpd.conf file, I can able to get the proper data.

1.But I get the error "2023-10-21 19:36:26: (configfile.c.1316) source: lighttpd.conf line: 46 pos: 15 parser failed somehow near here: /evenodd "

fastcgi.debug = 1
fastcgi.server = (

    "/hello" => ((
    "bin-path" => "/etc/lighttpd/hello_fastcgi.fcgi",
    "socket" => "/tmp/hello_fastcgi.sock",
    "check-local" => "disable",
    "max-procs" => 2,
  ))

   "/evenodd" => ((
    "bin-path" => "/etc/lighttpd/even_odd.fcgi",
    "socket" => "/tmp/even_odd.sock",
    "check-local" => "disable",
    "max-procs" => 2,
  ))
)

2. If I remove /hello , then I get no error and I can work with /evenodd
If I remove /evenodd , then I get no error and I can work with /hello

Is there a way, Where I can mention both /hello and /evenodd and work with both.

Please suggest

RE: Exact data not getting on the browser - Added by gstrauss about 1 month ago

You're missing a comma after )). The comma delineates elements in the list.

You are having trouble with basic syntax. Please see Configuration: File Syntax and read the examples in mod_fastcgi more carefully.

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