Man page - curlopt_proxy_transfer_mode(3)
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Manual
| CURLOPT_PROXY_TRANSFER_MODE(3) | Library Functions Manual | CURLOPT_PROXY_TRANSFER_MODE(3) |
NAME
CURLOPT_PROXY_TRANSFER_MODE - append FTP transfer mode to URL for proxy
SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TRANSFER_MODE,
long enabled);
DESCRIPTION
Pass a long. If the value is set to 1 (one), it tells libcurl to set the transfer mode (binary or ASCII) for FTP transfers done via an HTTP proxy, by appending ;type=a or ;type=i to the URL. Without this setting, or it being set to 0 (zero, the default), CURLOPT_TRANSFERTEXT(3) has no effect when doing FTP via a proxy. Beware that not all proxies support this feature.
DEFAULT
0, disabled
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL,
"ftp://example.com/old-server/file.txt");
curl_easy_setopt(curl, CURLOPT_PROXY, "http://localhost:80");
curl_easy_setopt(curl, CURLOPT_PROXY_TRANSFER_MODE, 1L);
curl_easy_setopt(curl, CURLOPT_TRANSFERTEXT, 1L);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.18.0
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_CRLF(3), CURLOPT_HTTPPROXYTUNNEL(3), CURLOPT_PROXY(3), CURLOPT_TRANSFERTEXT(3)
| 2025-11-09 | libcurl |