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 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 strangename"kind. When the containing multipart form is
              sent, this is normally transmitted as strangename%22kind. When this option is set, it is  sent  as
              strangename"kind.

DEFAULT

       0, meaning disabled.

PROTOCOLS

       This functionality affects http, imap and smtp

EXAMPLE

       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);
         }
       }

AVAILABILITY

       Added in curl 7.81.0

RETURN VALUE

       Returns CURLE_OK

SEE ALSO

       CURLOPT_HTTPPOST(3), CURLOPT_MIMEPOST(3)