---
name: "CURLOPT_POSTFIELDSIZE_LARGE"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_POSTFIELDSIZE_LARGE"
---

# CURLOPT\_POSTFIELDSIZE\_LARGE(3)

size of POST data pointed to

## NAME

CURLOPT\_POSTFIELDSIZE\_LARGE - size of POST data pointed to

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTFIELDSIZE_LARGE,
                          curl_off_t size);
```

## DESCRIPTION

If you want to post static data to the server without having libcurl do a strlen() to measure the data size, this option must be used. When this option is used you can post fully binary data, which otherwise is likely to fail. If this size is set to -1, libcurl uses strlen() to get the size or relies on the *[CURLOPT\_READFUNCTION(3)](/CURLOPT_READFUNCTION/3.md)* (if used) to signal the end of data.

## DEFAULT

\-1

## PROTOCOLS

HTTP(S)

## EXAMPLE

```
extern char *large_chunk; /* pointer to somewhere */
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    const char *data = large_chunk;
    curl_off_t length_of_data; /* set somehow */
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    /* size of the POST data */
    curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, length_of_data);
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
    curl_easy_perform(curl);
  }
}
```

## AVAILABILITY

Along with HTTP

## RETURN VALUE

Returns CURLE\_OK if HTTP is supported, and CURLE\_UNKNOWN\_OPTION if not.

## SEE ALSO

[**CURLOPT\_COPYPOSTFIELDS**(3)](/CURLOPT_COPYPOSTFIELDS/3.md), [**CURLOPT\_POSTFIELDS**(3)](/CURLOPT_POSTFIELDS/3.md), [**CURLOPT\_POSTFIELDSIZE**(3)](/CURLOPT_POSTFIELDSIZE/3.md)