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) || \

tests/data/Makefile.am

@@ -33,7 +33,7 @@ EXTRA_DIST = test1 test108 test117 test127 test20 test27 test34 test46	\
  test241 test242 test519 test214 test215 test216 test217 test218	\
  test199 test225 test226 test227 test230 test231 test232 test228	\
  test229 test233 test234 test235 test236 test520 test237 test238 \
- test239 test243 test245 test246 test247 test248
+ test239 test243 test245 test246 test247 test248 test249
 
 # The following tests have been removed from the dist since they no longer
 # work. We need to fix the test suite's FTPS server first, then bring them

tests/data/test249

+#
+# Server-side
+<reply>
+<data>
+HTTP/1.1 304 Not Modified swsclose
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 1910 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 677777
+Connection: close
+Content-Type: text/html
+
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+ <name>
+HTTP 304 response with "illegal" Content-Length: header
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/249 -z "dec 12 12:00:00 1999 GMT"
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /249 HTTP/1.1
+Host: 127.0.0.1:%HTTPPORT
+Pragma: no-cache
+Accept: */*
+If-Modified-Since: Sun, 12 Dec 1999 12:00:00 GMT
+
+</protocol>
+</verify>