---
name: "CURLMOPT_MAX_CONCURRENT_STREAMS"
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/CURLMOPT_MAX_CONCURRENT_STREAMS"
---

# CURLMOPT\_MAX\_CONCURRENT\_STREAMS(3)

max concurrent streams for http2

## NAME

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

## SYNOPSIS

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

## 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

100

## PROTOCOLS

This functionality affects http only

## EXAMPLE

```
int main(void)
{
  CURLM *m = curl_multi_init();
  /* max concurrent streams 200 */
  curl_multi_setopt(m, CURLMOPT_MAX_CONCURRENT_STREAMS, 200L);
}
```

## AVAILABILITY

Added in curl 7.67.0

## RETURN VALUE

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

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

## SEE ALSO

[**CURLMOPT\_MAXCONNECTS**(3)](/CURLMOPT_MAXCONNECTS/3.md), [**CURLOPT\_MAXCONNECTS**(3)](/CURLOPT_MAXCONNECTS/3.md)