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Editorial Team
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Asked: 2026-05-13T01:25:22+00:00

I am having C function. From the html page, through ajaxcall the request is

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I am having C function. From the html page, through ajaxcall the request is passed and the response is got.

If I perform some action like click submit button, then some action will be performed. How to get back to the same html page after redirection?

Can I set the environment variable which automatically redirects me to that page?

EDIT: Adding more detail from ‘answer’ below

Thank you Roe.

As I am new to this I am not able to get it. If we are using php then I can get the URL and put it in the header(“Location:”.$url).

But I am having only C functions.

HTML Code

function x(id)
{
    var val;
    var URL = window.location.href;
    if(id =="y")
    {
        val=1;
        document.location = "http://ipaddr/cgi-bin/file.cgi?value="+val+"&url="+URL;
    }
}

C Code

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{
    printf("Content-type: text/html; charset=utf-8\n\n");

    char* data = getenv("QUERY_STRING");
        //process
}

How to return from C to the same page? How to give header(“Location:”.$url); in C??

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1 Answer

  1. Editorial Team

    The referring page is given by the environment variable HTTP_REFERER. You can get back to the same page you came from by using a redirect page, like the following:

    const char * redirect_page_format =
"<html>\n"
"<head>\n"
"<meta http-equiv=\"REFRESH\"\n"
"content=\"0;url=%s\">\n"
"</head>\n"
"</html>\n";
printf (redirect_page_format, getenv (HTTP_REFERER));

    Ideally you should check that HTTP_REFERER is a valid environment variable before doing this.

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