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.\" generated by cd2nroff 0.1 from CURLOPT_COOKIEFILE.md
.TH CURLOPT_COOKIEFILE 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_COOKIEFILE \- filename to read cookies from
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIEFILE, char *filename);
.fi
.SH DESCRIPTION
Pass a pointer to a null\-terminated string as parameter. It should point to
the filename of your file holding cookie data to read. The cookie data can be
in either the old Netscape / Mozilla cookie data format or just regular HTTP
headers (Set\-Cookie style) dumped to a file.

It also enables the cookie engine, making libcurl parse and send cookies on
subsequent requests with this handle.

By passing the empty string ("") to this option, you enable the cookie engine
without reading any initial cookies. If you tell libcurl the filename is "\-"
(just a single minus sign), libcurl instead reads from stdin.

This option only \fBreads\fP cookies. To make libcurl write cookies to file,
see \fICURLOPT_COOKIEJAR(3)\fP.

If you read cookies from a plain HTTP headers file and it does not specify a
domain in the Set\-Cookie line, then the cookie is not sent since the cookie
domain cannot match the target URL\(aqs. To address this, set a domain in
Set\-Cookie line (doing that includes subdomains) or preferably: use the
Netscape format.

The application does not have to keep the string around after setting this
option.

If you use this option multiple times, you add more files to read cookies
from. Setting this option to NULL disables the cookie engine and clears the
list of files to read cookies from.
.SH SECURITY CONCERNS
This document previously mentioned how specifying a non\-existing file can also
enable the cookie engine. While true, we strongly advise against using that
method as it is too hard to be sure that files that stay that way in the long
run.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");

    /* get cookies from an existing file */
    curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "/tmp/cookies.txt");

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);
  }
}
.fi
.SH Cookie file format
The cookie file format and general cookie concepts in curl are described
online here: https://curl.se/docs/http\-cookies.html
.SH AVAILABILITY
Added in curl 7.1
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_COOKIE (3),
.BR CURLOPT_COOKIEJAR (3),
.BR CURLOPT_COOKIESESSION (3)
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