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CURLOPT_MIME_OPTIONS(3) curl_easy_setopt options CURLOPT_MIME_OPTIONS(3)
CURLOPT_MIME_OPTIONS - set MIME option flags
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MIME_OPTIONS, long options);
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:
Tells libcurl to escape multipart form field and file names
using the backslash-escaping algorithm rather than percent-
encoding (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
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
allows one 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.
0, meaning disabled.
HTTP, IMAP, SMTP
CURL *curl = curl_easy_init();
curl_mime *form = NULL;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_MIME_OPTIONS, CURLMIMEOPT_FORMESCAPE);
form = curl_mime_init(curl);
curl_mimepart *part = curl_mime_addpart(form);
curl_easy_setopt(curl, CURLOPT_MIMEPOST, form);
/* Perform the request */
Option added in 7.81.0.
libcurl 7.86.0 September 2, 2022 CURLOPT_MIME_OPTIONS(3)