fixed the 304 response-with-content-length problem reported by Cory Nelson

lib/transfer.c

@@ -697,6 +697,7 @@ CURLcode Curl_readwrite(struct connectdata *conn,
                    * fields.  */
                   conn->size=0;
                   conn->maxdownload=0;
+                  k->ignorecl = TRUE; /* ignore Content-Length headers */
                   break;
                 default:
                   /* nothing */
@@ -713,7 +714,7 @@ CURLcode Curl_readwrite(struct connectdata *conn,
                the header completely if we get a 416 response as then we're
                resuming a document that we don't get, and this header contains
                info about the true size of the document we didn't get now. */
-            if ((k->httpcode != 416) &&
+            if (!k->ignorecl &&
                 checkprefix("Content-Length:", k->p)) {
               contentlength = curlx_strtoofft(k->p+15, NULL, 10);
               if (data->set.max_filesize &&

lib/urldata.h

@@ -494,6 +494,8 @@ struct Curl_transfer_keeper {
                        and we're uploading the last chunk */
 
   bool ignorebody;  /* we read a response-body but we ignore it! */
+  bool ignorecl;    /* This HTTP response has no body so we ignore the Content-
+                       Length: header */
 };
 
 #if defined(USE_ARES) || defined(USE_THREADING_GETHOSTBYNAME) || \