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webfs: write headers individually so they are not limited in sum to the 8k buffer

--- a/sys/src/cmd/webfs/http.c

+++ b/sys/src/cmd/webfs/http.c

@@ -683,7 +683,13 @@

 			/* only send proxy headers when establishing tunnel */

 			if(h->tunnel && cistrncmp(k->key, "Proxy-", 6) != 0)

 				continue;

-			n += snprint(buf+n, sizeof(buf)-2 - n, "%s: %s\r\n", k->key, k->val);

+			if(n > 0){

+				if(debug)

+					fprint(2, "-> %.*s", n, buf);

+				if(hwrite(h, buf, n) != n)

+					goto Badflush;

+			}

+			n = snprint(buf, sizeof(buf)-2, "%s: %s\r\n", k->key, k->val);

 		}

 		n += snprint(buf+n, sizeof(buf)-n, "\r\n");

 		if(debug)