diff -Naur nginx_uploadprogress_module/ngx_http_uploadprogress_module.c nginx_uploadprogress_module_safari_fix/ngx_http_uploadprogress_module.c
--- nginx_uploadprogress_module/ngx_http_uploadprogress_module.c	2007-10-10 11:42:17.000000000 +0000
+++ nginx_uploadprogress_module_safari_fix/ngx_http_uploadprogress_module.c	2008-02-29 14:24:49.000000000 +0000
@@ -7,6 +7,7 @@
 #include 
 #include 
 #include 
+#include 

 #define TIMER_FREQUENCY 15 * 1000

@@ -113,12 +114,12 @@
     NGX_MODULE_V1_PADDING
 };

-static ngx_str_t x_progress_id = ngx_string("X-Progress-ID");
+static ngx_str_t x_progress_id = ngx_string("X-PROGRESS-ID");

 static ngx_str_t*
 get_tracking_id(ngx_http_request_t * r)
 {
-    u_char                          *p, *start_p;
+    u_char                          *p, *start_p, *hp;
     ngx_uint_t                       i;
     ngx_list_part_t                 *part;
     ngx_table_elt_t                 *header;
@@ -139,6 +140,10 @@
             i = 0;
         }

+        /* Make header match case-insensitive */
+        hp = header[i].key.data;
+        while(*hp) { *hp=toupper(*hp); hp++; }
+
         if (header[i].key.len == x_progress_id.len
             && ngx_strncmp(header[i].key.data, x_progress_id.data,
                            header[i].key.len) == 0) {