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CURLOPT_COOKIEFILE(3) curl_easy_setopt options CURLOPT_COOKIEFILE(3)
CURLOPT_COOKIEFILE - file name to read cookies from
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIEFILE, char *filename);
Pass a pointer to a null-terminated string as parameter. It should
point to the file name 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
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
file name is "-" (just a single minus sign), libcurl will instead read
This option only reads cookies. To make libcurl write cookies to file,
If you use the Set-Cookie file format and do not specify a domain then
the cookie is not sent since the domain will never match. To address
this, set a domain in Set-Cookie line (doing that will include sub-
domains) or preferably: use the Netscape format.
If you use this option multiple times, you just add more files to read.
Subsequent files will add more cookies.
The application does not have to keep the string around after setting
Setting this option to NULL will (since 7.77.0) explicitly disable the
cookie engine and clear the list of files to read cookies from.
This document previously mentioned how specifying a non-existing file
can also enable the cookie engine. While true, we strongly advice
against using that method as it is too hard to be sure what files will
stay that way in the long run.
CURL *curl = curl_easy_init();
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");
ret = curl_easy_perform(curl);
Cookie file format
The cookie file format and general cookie concepts in curl are
described online here: https://curl.se/docs/http-cookies.html
As long as HTTP is supported
Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
libcurl 7.86.0 October 6, 2022 CURLOPT_COOKIEFILE(3)