diff --git a/INSTALL b/INSTALL
index e4df048..74a19a9 100644
--- a/INSTALL
+++ b/INSTALL
@@ -169,8 +169,8 @@ as per the example configuration file in examples/apache_luminotes.
 
 For nginx, if you want a working upload progress bar, build and install a
 version of nginx with the NginxHttpUploadProgressModule enabled. See:
-http://wiki.nginx.org//NginxHttpUploadProgressModule for more information.
-Then, configure nginx as per the example configuration file in
+http://github.com/masterzen/nginx-upload-progress-module/ for more
+information. Then, configure nginx as per the example configuration file in
 examples/nginx_luminotes.
 
 For either web server, you should change the paths in your configuration file
diff --git a/controller/Files.py b/controller/Files.py
index cd5d6b9..3a0d514 100644
--- a/controller/Files.py
+++ b/controller/Files.py
@@ -133,7 +133,10 @@ class Upload_file( object ):
 
   @staticmethod
   def delete_file( file_id ):
-    return os.remove( Upload_file.make_server_filename( file_id ) )
+    try:
+      return os.remove( Upload_file.make_server_filename( file_id ) )
+    except OSError:
+      pass
 
   filename = property( lambda self: self.__filename )
 
@@ -174,7 +177,7 @@ class FieldStorage( cherrypy._cpcgifs.FieldStorage ):
     # pluck the file id out of the query string. it would be preferable to grab it out of parsed
     # form variables instead, but at this point in the processing, all the form variables might not
     # be parsed
-    file_id = cgi.parse_qs( cherrypy.request.query_string ).get( u"file_id", [ None ] )[ 0 ]
+    file_id = cgi.parse_qs( cherrypy.request.query_string ).get( u"X-Progress-ID", [ None ] )[ 0 ]
     try:
       file_id = Valid_id()( file_id )
     except ValueError:
@@ -549,13 +552,13 @@ class Files( object ):
     upload = (),
     notebook_id = Valid_id(),
     note_id = Valid_id( none_okay = True ),
-    file_id = Valid_id(),
+    x_progress_id = Valid_id(),
     user_id = Valid_id( none_okay = True ),
   )
-  def upload( self, upload, notebook_id, note_id, file_id, user_id ):
+  def upload( self, upload, notebook_id, note_id, x_progress_id, user_id ):
     """
-    Upload a file from the client for attachment to a particular note. The file_id must be provided
-    as part of the query string, even if the other values are submitted as form data.
+    Upload a file from the client for attachment to a particular note. The x_progress_id must be
+    provided as part of the query string, even if the other values are submitted as form data.
 
     @type upload: cgi.FieldStorage
     @param upload: file handle to uploaded file
@@ -563,8 +566,8 @@ class Files( object ):
     @param notebook_id: id of the notebook that the upload is to
     @type note_id: unicode or NoneType
     @param note_id: id of the note that the upload is to (if any)
-    @type file_id: unicode
-    @param file_id: id of the file being uploaded
+    @type x_progess_id: unicode
+    @param x_progess_id: id of the file being uploaded
     @type user_id: unicode or NoneType
     @param user_id: id of current logged-in user (if any)
     @rtype: unicode
@@ -573,6 +576,7 @@ class Files( object ):
     @raise Upload_error: the Content-Length header value is invalid
     """
     global current_uploads, current_uploads_lock
+    file_id = x_progress_id
 
     current_uploads_lock.acquire()
     try:
@@ -624,10 +628,10 @@ class Files( object ):
   @end_transaction
   @grab_user_id
   @validate(
-    file_id = Valid_id(),
+    x_progress_id = Valid_id(),
     user_id = Valid_id( none_okay = True ),
   )
-  def progress( self, file_id, user_id = None ):
+  def progress( self, x_progress_id, user_id = None ):
     """
     Return information on a file that is in the process of being uploaded. This method does not
     perform any access checks, but the only information revealed is the file's upload progress.
@@ -636,8 +640,8 @@ class Files( object ):
     intended to mimic the API described here:
     http://wiki.nginx.org//NginxHttpUploadProgressModule
 
-    @type file_id: unicode
-    @param file_id: id of a currently uploading file
+    @type x_progress_id: unicode
+    @param x_progress_id: id of a currently uploading file
     @type user_id: unicode or NoneType
     @param user_id: id of current logged-in user (if any)
     @rtype: dict
@@ -649,6 +653,7 @@ class Files( object ):
         'received': bytes_received, 'size': total_bytes }
     """
     global current_uploads
+    file_id = x_progress_id
 
     uploading_file = current_uploads.get( file_id )
     db_file = None
diff --git a/controller/Validate.py b/controller/Validate.py
index 43e1c17..945bf30 100644
--- a/controller/Validate.py
+++ b/controller/Validate.py
@@ -221,6 +221,13 @@ def validate( **expected ):
       args = list( args )
       args_index = 1 # skip the self argument
 
+      # make sure all kwarg names are lowercase and don't have dashes
+      for ( kwarg_name, value ) in kwargs.items():
+        new_kwarg_name = kwarg_name.replace( "-", "_" ).lower()
+        if new_kwarg_name != kwarg_name:
+          del( kwargs[ kwarg_name ] )
+          kwargs[ new_kwarg_name ] = value
+
       # determine the expected argument names from the decorated function itself
       code = function.func_code
       expected_names = code.co_varnames[ : code.co_argcount ]
diff --git a/examples/nginx_luminotes b/examples/nginx_luminotes
index 887b69d..348f553 100644
--- a/examples/nginx_luminotes
+++ b/examples/nginx_luminotes
@@ -2,6 +2,8 @@ gzip_comp_level 4;
 gzip_min_length 1100;
 gzip_types text/plain text/html text/css application/x-javascript;
 
+upload_progress luminotes 1m;
+
 upstream luminotes {
   server 127.0.0.1:8081;
 }
@@ -15,6 +17,11 @@ server {
   location / {
     proxy_pass http://luminotes;
     client_max_body_size 505m;
+    track_uploads luminotes 30s;
+  }
+
+  location ^~ /files/progress {
+    report_uploads luminotes;
   }
 
   location /download/ {
diff --git a/static/js/Wiki.js b/static/js/Wiki.js
index f939043..0f3ddbd 100644
--- a/static/js/Wiki.js
+++ b/static/js/Wiki.js
@@ -3641,10 +3641,10 @@ function Upload_pulldown( wiki, notebook_id, invoker, editor, link, anchor, ephe
   appendChildNodes( this.upload_area, createDOM( "form",
     {
       "target": "upload_frame",
-      "action": "/files/upload?file_id=new",
+      "action": "/files/upload?X-Progress-ID=new&file_id=new",
       "method": "post",
       "enctype": "multipart/form-data",
-      "id": "upload_form"
+      "id": "upload_form",
     },
     createDOM( "span", { "class": "field_label" }, this.link ? "attach file: " : "import file: " ),
     createDOM( "input", { "name": "notebook_id", "id": "notebook_id", "type": "hidden", "value": notebook_id } ),
@@ -3681,7 +3681,7 @@ Upload_pulldown.prototype.update_file_id = function ( result ) {
 
   var upload_form = getElement( "upload_form" )
   if ( upload_form )
-    upload_form.action = "/files/upload?file_id=" + this.file_id;
+    upload_form.action = "/files/upload?X-Progress-ID=" + this.file_id;
 
   var file_id_node = getElement( "file_id" );
   if ( file_id_node )
@@ -3738,9 +3738,8 @@ Upload_pulldown.prototype.update_progress = function () {
   var self = this;
   var BAR_WIDTH_EM = 20.0;
 
-  // TODO: send X- HTTP header nginx expects with file_id
   this.invoker.invoke( "/files/progress", "GET",
-    { "file_id": this.file_id },
+    { "X-Progress-ID": this.file_id },
     function( result ) {
       var fraction_done = 0.0;
       if ( !self.uploading )