CURLMOPT\_MAX\_CONCURRENT\_STREAMS(3) Library Functions Manual CURLMOPT\_MAX\_CONCURRENT\_STREAMS(3)

# [NAME](#NAME)

CURLMOPT\_MAX\_CONCURRENT\_STREAMS - max concurrent streams for http2

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_CONCURRENT_STREAMS,


                            long max);
```

# [DESCRIPTION](#DESCRIPTION)

Pass a long indicating the **max**. The set number is used as the maximum number of concurrent streams libcurl should support on connections done using HTTP/2 or HTTP/3.

Valid values range from 1 to 2147483647 (2^31 - 1) and defaults to 100. The value passed here would be honored based on other system resources properties.

# [DEFAULT](#DEFAULT)

100

# [PROTOCOLS](#PROTOCOLS)

This functionality affects http only

# [EXAMPLE](#EXAMPLE)

```
int main(void)
{


  CURLM *m = curl_multi_init();


  /* max concurrent streams 200 */


  curl_multi_setopt(m, CURLMOPT_MAX_CONCURRENT_STREAMS, 200L);
}
```

# [AVAILABILITY](#AVAILABILITY)

Added in curl 7.67.0

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_multi\_setopt(3)*](/man/os/curl/curl_multi_setopt.3) returns a CURLMcode indicating success or error.

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

# [SEE ALSO](#SEE_ALSO)

[**CURLMOPT\_MAXCONNECTS**(3)](/man/os/curl/CURLMOPT_MAXCONNECTS.3), [**CURLOPT\_MAXCONNECTS**(3)](/man/os/curl/CURLOPT_MAXCONNECTS.3)

2026-10-14 libcurl

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Document: CURLMOPT_MAX_CONCURRENT_STREAMS(3) from curl 8.23.0-r0 (Chainguard OS)
Source: https://github.com/curl/curl.git