fix multipart parser

Content-Type is optional and not well defined, so do not use it.

PVE/HTTPServer.pm

@@ -512,23 +512,25 @@ sub file_upload_multipart {
 		}
 
 		if (!($disp && $disp eq 'form-data' && $name)) {
-		    syslog('err', "wrong content disposition im multipart - abort upload");
+		    syslog('err', "wrong content disposition in multipart - abort upload");
 		    $rstate->{phase} = -1;
 		} else {
 
 		    $rstate->{fieldname} = $name;
 
-		    if (!$ct) {
-			# found form data for field $name
-			$rstate->{phase} = 2;
-		    } elsif ($ct && $ct eq 'application/octet-stream' && $name eq 'filename' && $filename) {
+		    if ($filename) {
+			if ($name eq 'filename') {
 			    # found file upload data
 			    $rstate->{phase} = 1;
 			    $rstate->{filename} = $filename;
 			} else {
-			syslog('err', "wrong content type '$ct' im multipart - abort upload");
+			    syslog('err', "wrong field name for file upload - abort upload");
 			    $rstate->{phase} = -1;
 			}
+		    } else {
+			# found form data for field $name
+			$rstate->{phase} = 2;
+		    }
 		}
 	    } else {
 		my $len = length($hdl->{rbuf});