---
name: "CURLMOPT_MAX_PIPELINE_LENGTH"
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_PIPELINE_LENGTH"
---

# CURLMOPT\_MAX\_PIPELINE\_LENGTH(3)

maximum number of requests in a pipeline

## NAME

CURLMOPT\_MAX\_PIPELINE\_LENGTH - maximum number of requests in a pipeline

## SYNOPSIS

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

## DESCRIPTION

No function since pipelining was removed in 7.62.0.

Pass a long. The set **max** number is used as the maximum amount of outstanding requests in an HTTP/1.1 pipeline. This option is only used for HTTP/1.1 pipelining, not for HTTP/2 multiplexing.

When this limit is reached, libcurl creates another connection to the same host (see *[CURLMOPT\_MAX\_HOST\_CONNECTIONS(3)](/CURLMOPT_MAX_HOST_CONNECTIONS/3.md)*), or queue the request until one

```
of the pipelines to the host is ready to accept a request. Thus, the total
```

number of requests in-flight is *[CURLMOPT\_MAX\_HOST\_CONNECTIONS(3)](/CURLMOPT_MAX_HOST_CONNECTIONS/3.md)* \* *[CURLMOPT\_MAX\_PIPELINE\_LENGTH(3)](/CURLMOPT_MAX_PIPELINE_LENGTH/3.md)*.

## DEFAULT

5

## PROTOCOLS

This functionality affects all supported protocols

## EXAMPLE

```
int main(void)
{
  CURLM *m = curl_multi_init();
  /* set a more conservative pipe length */
  curl_multi_setopt(m, CURLMOPT_MAX_PIPELINE_LENGTH, 3L);
}
```

## AVAILABILITY

Added in curl 7.30.0

## 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\_MAX\_HOST\_CONNECTIONS**(3)](/CURLMOPT_MAX_HOST_CONNECTIONS/3.md), [**CURLMOPT\_PIPELINING**(3)](/CURLMOPT_PIPELINING/3.md)