---
name: "curl_easy_duphandle"
section: "3"
platform: "linux"
package: "curl"
version: "8.23.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/curl_easy_duphandle"
---

# curl\_easy\_duphandle(3)

clone an easy handle

## 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 options previously set in the input curl *handle*. Both handles can subsequently be used independently and they must both be freed with *[curl\_easy\_cleanup(3)](/curl_easy_cleanup/3.md)*.

Any options that the input handle has been told to point to (as opposed to copy) with previous calls to *[curl\_easy\_setopt(3)](/curl_easy_setopt/3.md)*, 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 object states or options (created as if *[CURLOPT\_SHARE(3)](/CURLOPT_SHARE/3.md)* was set to NULL).

If the source handle has HSTS or alt-svc enabled, the duplicate gets data read from the main filename to populate the cache. For HSTS, any entries learned at runtime (E.g. *Strict-Transport-Security* response headers) are also copied to the duplicate handle.

In multi-threaded programs, this function must be called in a synchronous 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 result;
    CURL *nother;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    nother = curl_easy_duphandle(curl);
    result = 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_cleanup/3.md), [**curl\_easy\_init**(3)](/curl_easy_init/3.md), [**curl\_easy\_reset**(3)](/curl_easy_reset/3.md), [**curl\_global\_init**(3)](/curl_global_init/3.md)