diff -burN php-5.0.0b3/ext/zlib/zlib.c php-5.0.0b3-zlib/ext/zlib/zlib.c
--- php-5.0.0b3/ext/zlib/zlib.c	2003-09-26 10:09:53.000000000 +0200
+++ php-5.0.0b3-zlib/ext/zlib/zlib.c	2003-12-27 00:40:53.000000000 +0100
@@ -979,6 +979,11 @@
 
 	if (ZLIBG(output_handler) && strlen(ZLIBG(output_handler))) {
 		php_start_ob_buffer_named(ZLIBG(output_handler), 0, 1 TSRMLS_CC);
+		if (sapi_add_header("Content-Encoding: gzip", sizeof("Content-Encoding: gzip") - 1        , 1)!=FAILURE) {
+			if (sapi_add_header("Vary: Accept-Encoding", sizeof("Vary: Accept-Encoding") - 1, 1)==FAILURE) {
+				SG(sapi_headers).send_default_content_type = 0;
+			}
+		}
 	}
 	return SUCCESS;
 }