.\" generated by cd2nroff 0.1 from CURLOPT_MIME_OPTIONS.md
.TH CURLOPT_MIME_OPTIONS 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_MIME_OPTIONS \- set MIME option flags
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MIME_OPTIONS, long options);
.fi
.SH 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:
.IP CURLMIMEOPT_FORMESCAPE
Tells libcurl to escape multipart form field and filenames 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 %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 allows one to address
server\-side applications that have not yet have been converted.

As an example, consider field or filename \fIstrangename"kind\fP. When the
containing multipart form is sent, this is normally transmitted as
\fIstrangename%22kind\fP. When this option is set, it is sent as
\fIstrangename"kind\fP.
.SH DEFAULT
0, meaning disabled.
.SH PROTOCOLS
This functionality affects http, imap and smtp
.SH EXAMPLE
.nf
int main(void)
{
  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(form);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.81.0
.SH RETURN VALUE
Returns CURLE_OK
.SH SEE ALSO
.BR CURLOPT_HTTPPOST (3),
.BR CURLOPT_MIMEPOST (3)