CURLOPT_MIME_OPTIONS(3)    Library Functions Manual    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 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
       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
       Option added in 7.81.0.

RETURN VALUE
       Returns CURLE_OK

SEE ALSO
       CURLOPT_HTTPPOST(3), CURLOPT_MIMEPOST(3)

libcurl                          April 26 2024         CURLOPT_MIME_OPTIONS(3)