--- ../../apache_1.1b4_pure/src/http_protocol.c	Mon Jun 17 13:55:25 1996
+++ http_protocol.c	Mon Jul  8 17:19:27 1996
@@ -734,8 +734,20 @@
 
     bputs("\015\012",fd);
 
+#ifdef ISI_NOFLUSH_HEADERS
+    /*
+     * Flushing the output stream at this point sends a sub-size
+     * segment.  Sub-size segments interact poorly with BSD-TCP's
+     * slow-start and delayed acknowledgment algorithms, resulting
+     * in a delayed acknowledgment of a later packet and therefore
+     * up to 200ms additional delay.  Avoid this problem by not
+     * flushing the stream.
+     * -John Heidemann <johnh@isi.edu>
+     */
+#else /* ! ISI_NOFLUSH_HEADERS */
     if (c->keepalive)
 	bflush(r->connection->client);  /* For bugs in Netscape, perhaps */
+#endif /* ISI_NOFLUSH_HEADERS */
 
     bsetopt(fd, BO_BYTECT, &zero);
     r->sent_bodyct = 1;		/* Whatever follows is real body stuff... */