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CURLOPT_BUFFERSIZE(3) curl_easy_setopt options CURLOPT_BUFFERSIZE(3)
CURLOPT_BUFFERSIZE - receive buffer size
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_BUFFERSIZE, long size);
Pass a long specifying your preferred size (in bytes) for the receive
buffer in libcurl. The main point of this would be that the write
callback gets called more often and with smaller chunks. Secondly, for
some protocols, there's a benefit of having a larger buffer for
This is just treated as a request, not an order. You cannot be
guaranteed to actually get the given size.
This buffer size is by default CURL_MAX_WRITE_SIZE (16kB). The maximum
buffer size allowed to be set is CURL_MAX_READ_SIZE (512kB). The
minimum buffer size allowed to be set is 1024.
DO NOT set this option on a handle that is currently used for an active
transfer as that may lead to unintended consequences.
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/foo.bin");
/* ask libcurl to allocate a larger receive buffer */
curl_easy_setopt(curl, CURLOPT_BUFFERSIZE, 120000L);
ret = curl_easy_perform(curl);
Added in 7.10. Growing the buffer was added in 7.53.0.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
libcurl 7.86.0 August 23, 2022 CURLOPT_BUFFERSIZE(3)