Yves Lejeune fixed so that replacing Content-Type: when doing multipart

formposts work exactly the way you want it (and the way you'd assume it
works)

CHANGES

@@ -6,6 +6,11 @@
 
                                   Changelog
 
+Daniel (28 July 2006)
+- Yves Lejeune fixed so that replacing Content-Type: when doing multipart
+  formposts work exactly the way you want it (and the way you'd assume it
+  works).
+
 Daniel (27 July 2006)
 - David McCreedy added --ftp-ssl-reqd which makes curl *require* SSL for both
   control and data connection, as the existing --ftp-ssl option only requests

RELEASE-NOTES

@@ -24,6 +24,7 @@ This release includes the following changes:
 
 This release includes the following bugfixes:
 
+ o changing Content-Type when doing formposts
  o added CURL_EXTERN to a few recent multi functions that lacked them
  o splay-tree related problems for internal expire time handling
  o FTP ASCII CRLF counter reset
@@ -48,6 +49,6 @@ advice from friends like these:
 
  Dan Fandrich, Peter Silva, Arve Knudsen, Michael Wallner, Toshiyuki Maezawa,
  Ingmar Runge, Ates Goral, David McCreedy, Jari Sundell, Georg Horn,
- Gisle Vanem, Yang Tse, Michael Jerris, Dan Nelson
+ Gisle Vanem, Yang Tse, Michael Jerris, Dan Nelson, Yves Lejeune
 
         Thanks! (and sorry if I forgot to mention someone)

lib/formdata.c

@@ -899,9 +899,9 @@ int curl_formget(struct curl_httppost *form, void *arg,
   curl_off_t size;
   struct FormData *data, *ptr;
 
-  if ((rc = Curl_getFormData(&data, form, &size)) != CURLE_OK) {
+  rc = Curl_getFormData(&data, form, NULL, &size);
+  if (rc != CURLE_OK)
     return (int)rc;
-  }
 
   for (ptr = data; ptr; ptr = ptr->next) {
     if (ptr->type == FORM_FILE) {
@@ -1031,10 +1031,13 @@ static char *strippath(char *fullfile)
  * (possibly huge) multipart formdata. The input list is in 'post', while the
  * output resulting linked lists gets stored in '*finalform'. *sizep will get
  * the total size of the whole POST.
+ * A multipart/form_data content-type is built, unless a custom content-type
+ * is passed in 'custom_content_type'.
  */
 
 CURLcode Curl_getFormData(struct FormData **finalform,
                           struct curl_httppost *post,
+                          const char *custom_content_type,
                           curl_off_t *sizep)
 {
   struct FormData *form = NULL;
@@ -1058,9 +1061,11 @@ CURLcode Curl_getFormData(struct FormData **finalform,
 
   /* Make the first line of the output */
   result = AddFormDataf(&form, NULL,
-                        "Content-Type: multipart/form-data;"
-                        " boundary=%s\r\n",
+                        "%s; boundary=%s\r\n",
+                        custom_content_type?custom_content_type:
+                        "Content-Type: multipart/form-data",
                         boundary);
+
   if (result) {
     free(boundary);
     return result;
@@ -1083,6 +1088,10 @@ CURLcode Curl_getFormData(struct FormData **finalform,
     if (result)
       break;
 
+    /* Maybe later this should be disabled when a custom_content_type is
+       passed, since Content-Disposition is not meaningful for all multipart
+       types.
+    */
     result = AddFormDataf(&form, &size,
                           "Content-Disposition: form-data; name=\"");
     if (result)

lib/formdata.h

@@ -8,7 +8,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2006, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -69,6 +69,7 @@ int Curl_FormInit(struct Form *form, struct FormData *formdata );
 CURLcode
 Curl_getFormData(struct FormData **,
                  struct curl_httppost *post,
+                 const char *custom_contenttype,
                  curl_off_t *size);
 
 /* fread() emulation */

lib/http.c

@@ -1554,8 +1554,12 @@ static CURLcode add_custom_headers(struct connectdata *conn,
               header as that will produce *two* in the same request! */
            curl_strnequal("Host:", headers->data, 5))
           ;
+        else if(conn->data->set.httpreq == HTTPREQ_POST_FORM &&
+                /* this header (extended by formdata.c) is sent later */
+                curl_strnequal("Content-Type:", headers->data,
+                               strlen("Content-Type:")))
+          ;
         else {
-
           result = add_bufferf(req_buffer, "%s\r\n", headers->data);
           if(result)
             return result;
@@ -1809,6 +1813,7 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
     /* we must build the whole darned post sequence first, so that we have
        a size of the whole shebang before we start to send it */
      result = Curl_getFormData(&http->sendit, data->set.httppost,
+                               checkheaders(data, "Content-Type:"),
                                &http->postsize);
      if(CURLE_OK != result) {
        /* Curl_getFormData() doesn't use failf() */
@@ -2134,12 +2139,9 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
       if(result)
         return result;
 
-      if(!checkheaders(data, "Content-Type:")) {
-        /* Get Content-Type: line from Curl_formpostheader.
+      {
 
-           The Content-Type header line also contains the MIME boundary
-           string etc why disabling this header is likely to not make things
-           work, but we support disabling it anyway.
+        /* Get Content-Type: line from Curl_formpostheader.
         */
         char *contentType;
         size_t linelength=0;
@@ -2149,6 +2151,7 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
           failf(data, "Could not get Content-Type header line!");
           return CURLE_HTTP_POST_ERROR;
         }
+
         result = add_buffer(req_buffer, contentType, linelength);
         if(result)
           return result;