85 lines
2 KiB
Markdown
85 lines
2 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_RANGE
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_LOW_SPEED_LIMIT (3)
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- CURLOPT_MAXFILESIZE_LARGE (3)
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- CURLOPT_MAX_RECV_SPEED_LARGE (3)
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- CURLOPT_RESUME_FROM (3)
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---
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# NAME
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CURLOPT_RANGE - byte range to request
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RANGE, char *range);
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~~~
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# DESCRIPTION
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Pass a char pointer as parameter, which should contain the specified range you
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want to retrieve. It should be in the format "X-Y", where either X or Y may be
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left out and X and Y are byte indexes.
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HTTP transfers also support several intervals, separated with commas as in
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*"X-Y,N-M"*. Using this kind of multiple intervals causes the HTTP server
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to send the response document in pieces (using standard MIME separation
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techniques). Unfortunately, the HTTP standard (RFC 7233 section 3.1) allows
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servers to ignore range requests so even when you set CURLOPT_RANGE(3)
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for a request, you may end up getting the full response sent back.
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For RTSP, the formatting of a range should follow RFC 2326 Section 12.29. For
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RTSP, byte ranges are **not** permitted. Instead, ranges should be given in
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**npt**, **utc**, or **smpte** formats.
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For HTTP PUT uploads this option should not be used, since it may conflict with
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other options.
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Pass a NULL to this option to disable the use of ranges.
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The application does not have to keep the string around after setting this
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option.
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# DEFAULT
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NULL
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# PROTOCOLS
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HTTP, FTP, FILE, RTSP and SFTP.
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* get the first 200 bytes */
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curl_easy_setopt(curl, CURLOPT_RANGE, "0-199");
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/* Perform the request */
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curl_easy_perform(curl);
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}
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}
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~~~
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# AVAILABILITY
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FILE since 7.18.0, RTSP since 7.20.0
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# RETURN VALUE
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Returns CURLE_OK on success or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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