CURLOPT_MIME_OPTIONS(3) curl_easy_setopt options CURLOPT_MIME_OPTIONS(3)
NAME
CURLOPT_MIME_OPTIONS - set MIME option flags
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MIME_OPTIONS, long options);
DESCRIPTION
Pass a long that holds a bitmask of CURLMIMEOPT_* defines. Each bit is
a Boolean flag used while encoding a MIME tree or multipart form data.
Available bits are:
CURLMIMEOPT_FORMESCAPE
Tells libcurl to escape multipart form field and file names us-
ing the backslash-escaping algorithm rather than percent-encod-
ing (HTTP only).
Backslash-escaping consists in preceding backslashes and double
quotes with a backslash. Percent encoding maps all occurrences
of double quote, carriage return and line feed to %22, %0D and
%0A respectively.
Before version 7.81.0, percent-encoding was never applied.
HTTP browsers used to do backslash-escaping in the past but have
over time transitioned to use percent-encoding. This option al-
lows to address server-side applications that have not yet have
been converted.
As an example, consider field or file name strange\name"kind.
When the containing multipart form is sent, this is normally
transmitted as strange\name%22kind. When this option is set, it
is sent as strange\\name\"kind.
DEFAULT
0, meaning disabled.
PROTOCOLS
HTTP, IMAP, SMTP
EXAMPLE
CURL *curl = curl_easy_init();
curl_mime *form = NULL;
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_MIME_OPTIONS, CURLMIMEOPT_FORMESCAPE);
form = curl_mime_init(curl);
if(form) {
curl_mimepart *part = curl_mime_addpart(form);
if(part) {
curl_mime_filedata(part, "strange\\file\\name");
curl_mime_name(part, "strange\"field\"name");
curl_easy_setopt(curl, CURLOPT_MIMEPOST, form);
/* Perform the request */
curl_easy_perform(curl);
}
}
curl_easy_cleanup(curl);
curl_mime_free(mime);
}
AVAILABILITY
Option added in 7.81.0.
RETURN VALUE
Returns CURLE_OK
SEE ALSO
CURLOPT_MIMEPOST(3), CURLOPT_HTTPPOST(3)
libcurl 7.81.0 November 26, 2021 CURLOPT_MIME_OPTIONS(3)
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