curl_easy_duphandle(3) Library Functions Manual curl_easy_duphandle(3)
NAME
curl_easy_duphandle - clone an easy handle
SYNOPSIS
#include <curl/curl.h>
CURL *curl_easy_duphandle(CURL *handle);
DESCRIPTION
This function returns a new curl handle, a duplicate, using all the op-
tions previously set in the input curl handle. Both handles can subse-
quently be used independently and they must both be freed with
curl_easy_cleanup(3).
Any options that the input handle has been told to point to (as opposed
to copy) with previous calls to curl_easy_setopt(3), are pointed to by
the new handle as well. You must therefore make sure to keep the data
around until both handles have been cleaned up.
The new handle does not inherit any state information, no connections,
no SSL sessions and no cookies. It also does not inherit any share ob-
ject states or options (created as if CURLOPT_SHARE(3) was set to NULL).
If the source handle has HSTS or alt-svc enabled, the duplicate gets
data read data from the main filename to populate the cache.
In multi-threaded programs, this function must be called in a synchro-
nous way, the input handle may not be in use when cloned.
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
CURL *nother;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
nother = curl_easy_duphandle(curl);
res = curl_easy_perform(nother);
curl_easy_cleanup(nother);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.9
RETURN VALUE
If this function returns NULL, something went wrong and no valid handle
was returned.
SEE ALSO
curl_easy_cleanup(3), curl_easy_init(3), curl_easy_reset(3),
curl_global_init(3)
libcurl 2026-07-12 curl_easy_duphandle(3)
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