1---
2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
3SPDX-License-Identifier: curl
4Title: CURLINFO_CONTENT_LENGTH_DOWNLOAD
5Section: 3
6Source: libcurl
7See-also:
8  - CURLINFO_CONTENT_LENGTH_UPLOAD (3)
9  - curl_easy_getinfo (3)
10  - curl_easy_setopt (3)
11Protocol:
12  - All
13Added-in: 7.6.1
14---
15
16# NAME
17
18CURLINFO_CONTENT_LENGTH_DOWNLOAD - get content-length of download
19
20# SYNOPSIS
21
22~~~c
23#include <curl/curl.h>
24
25CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD,
26                           double *content_length);
27~~~
28
29# DESCRIPTION
30
31Pass a pointer to a double to receive the content-length of the download. This
32is the value read from the Content-Length: field. Since 7.19.4, this returns
33-1 if the size is not known.
34
35CURLINFO_CONTENT_LENGTH_DOWNLOAD_T(3) is a newer replacement that returns a more
36sensible variable type.
37
38# %PROTOCOLS%
39
40# EXAMPLE
41
42~~~c
43int main(void)
44{
45  CURL *curl = curl_easy_init();
46  if(curl) {
47    CURLcode res;
48    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
49
50    /* Perform the request */
51    res = curl_easy_perform(curl);
52
53    if(!res) {
54      /* check the size */
55      double cl;
56      res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl);
57      if(!res) {
58        printf("Size: %.0f\n", cl);
59      }
60    }
61  }
62}
63~~~
64
65# DEPRECATED
66
67Deprecated since 7.55.0.
68
69# %AVAILABILITY%
70
71# RETURN VALUE
72
73Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
74