---
name: "CURLOPT_RTSP_SESSION_ID"
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/CURLOPT_RTSP_SESSION_ID"
---

# CURLOPT\_RTSP\_SESSION\_ID(3)

RTSP session ID

## NAME

CURLOPT\_RTSP\_SESSION\_ID - RTSP session ID

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RTSP_SESSION_ID, char *id);
```

## DESCRIPTION

Pass a char pointer as a parameter to set the value of the current RTSP Session ID for the handle. Useful for resuming an in-progress session. Once this value is set to any non-NULL value, libcurl returns *CURLE\_RTSP\_SESSION\_ERROR* if the ID received from the server does not match. If unset (or set to NULL), libcurl automatically sets the ID the first time the server sets it in a response. Such an ID is only sent back to the origin that issued it, unless *[CURLOPT\_UNRESTRICTED\_AUTH(3)](/CURLOPT_UNRESTRICTED_AUTH/3.md)* is set.

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

Using this option multiple times makes the last set string override the previous ones. Set it to NULL to disable its use again.

**WARNING:** when changing the URL's origin in a reused easy handle, you might want to set or clear the Session ID to avoid reuse across different hosts.

## DEFAULT

NULL

## PROTOCOLS

This functionality affects rtsp only

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    static const char *prev_id = "old"; /* previously retrieved
                                           RTSP session ID */
    curl_easy_setopt(curl, CURLOPT_URL, "rtsp://example.com/");
    curl_easy_setopt(curl, CURLOPT_RTSP_SESSION_ID, prev_id);
    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
```

## AVAILABILITY

Added in curl 7.20.0

## RETURN VALUE

*[curl\_easy\_setopt(3)](/curl_easy_setopt/3.md)* returns a CURLcode indicating success or error.

CURLE\_OK (0) means everything was OK, non-zero means an error occurred, see *[libcurl-errors(3)](/libcurl-errors/3.md)*.

## SEE ALSO

[**CURLOPT\_RTSP\_REQUEST**(3)](/CURLOPT_RTSP_REQUEST/3.md), [**CURLOPT\_RTSP\_STREAM\_URI**(3)](/CURLOPT_RTSP_STREAM_URI/3.md)