CURLINFO\_CONTENT\_LENGTH\_DOWNLOAD(3) Library Functions Manual CURLINFO\_CONTENT\_LENGTH\_DOWNLOAD(3)

# [NAME](#NAME)

CURLINFO\_CONTENT\_LENGTH\_DOWNLOAD - content-length of download

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD,


                           double *content_length);
```

# [DESCRIPTION](#DESCRIPTION)

Pass a pointer to a double to receive the content-length of the download. This is the value read from the Content-Length: field. This returns -1 if the size is not known.

[*CURLINFO\_CONTENT\_LENGTH\_DOWNLOAD\_T(3)*](/man/os/curl/CURLINFO_CONTENT_LENGTH_DOWNLOAD_T.3) is a newer replacement that returns a more sensible variable type.

# [PROTOCOLS](#PROTOCOLS)

This functionality affects all supported protocols

# [EXAMPLE](#EXAMPLE)

```
int main(void)
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode result;


    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");


    /* Perform the request */


    result = curl_easy_perform(curl);


    if(result == CURLE_OK) {


      /* check the size */


      double cl;


      result = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl);


      if(result == CURLE_OK) {


        printf("Size: %.0f\n", cl);


      }


    }


  }
}
```

# [DEPRECATED](#DEPRECATED)

Deprecated since 7.55.0.

# [AVAILABILITY](#AVAILABILITY)

Added in curl 7.6.1

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_easy\_getinfo(3)*](/man/os/curl/curl_easy_getinfo.3) returns a CURLcode indicating success or error.

CURLE\_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)

[**CURLINFO\_CONTENT\_LENGTH\_UPLOAD**(3)](/man/os/curl/CURLINFO_CONTENT_LENGTH_UPLOAD.3), [**curl\_easy\_getinfo**(3)](/man/os/curl/curl_easy_getinfo.3), [**curl\_easy\_setopt**(3)](/man/os/curl/curl_easy_setopt.3)

2026-10-19 libcurl

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Document: CURLINFO_CONTENT_LENGTH_DOWNLOAD(3) from curl 8.23.0-r1 (Chainguard OS)
Source: https://github.com/curl/curl.git