CURLOPT_RANGE(3) Library Functions Manual CURLOPT_RANGE(3)
NAME
CURLOPT_RANGE - byte range to request
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RANGE, char *range);
DESCRIPTION
Pass a char pointer as parameter, which should contain the specified
range you want to retrieve. It should be in the format "X-Y", where ei-
ther X or Y may be left out and X and Y are byte indexes.
HTTP transfers also support several intervals, separated with commas as
in "X-Y,N-M". Using this kind of multiple intervals causes the HTTP
server to send the response document in pieces (using standard MIME sep-
aration techniques) as a multiple part response which libcurl returns
as-is. It contains meta information in addition to the requested bytes.
Parsing or otherwise transforming this response is the responsibility of
the caller.
Unfortunately, the HTTP standard (RFC 7233 section 3.1) allows servers
to ignore range requests so even when you set CURLOPT_RANGE(3) for a re-
quest, you may end up getting the full response sent back.
For RTSP, the formatting of a range should follow RFC 2326 Section
12.29. For RTSP, byte ranges are not permitted. Instead, ranges should
be given in npt, utc, or smpte formats.
For HTTP PUT uploads this option should not be used, since it may con-
flict with other options.
Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to disable its use again.
The application does not have to keep the string around after setting
this option.
DEFAULT
NULL
PROTOCOLS
This functionality affects file, ftp, http, rtsp and sftp
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* get the first 200 bytes */
curl_easy_setopt(curl, CURLOPT_RANGE, "0-199");
/* Perform the request */
curl_easy_perform(curl);
}
}
HISTORY
FILE since 7.18.0, RTSP since 7.20.0
AVAILABILITY
Added in curl 7.1
RETURN VALUE
curl_easy_setopt(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).
SEE ALSO
CURLOPT_LOW_SPEED_LIMIT(3), CURLOPT_MAXFILESIZE_LARGE(3), CUR-
LOPT_MAX_RECV_SPEED_LARGE(3), CURLOPT_RESUME_FROM(3)
libcurl 2026-07-12 CURLOPT_RANGE(3)
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