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hproxy: fix ipv6 url parsing

--- a/sys/src/cmd/ip/hproxy.c

+++ b/sys/src/cmd/ip/hproxy.c

@@ -51,14 +51,17 @@

 		*p++ = 0;

 		path = p;

 	}

-	if(*host == '[')

+	if(*host == '['){

 		host++;

-	if(p = strrchr(host, ':')){

+		if(p = strrchr(host, ']')){

+			*p++ = 0;

+			if(p = strrchr(p, ':'))

+				port = ++p;

+		}

+	} else if(p = strrchr(host, ':')){

 		*p++ = 0;

 		port = p;

 	}

-	if(p = strrchr(host, ']'))

-		*p = 0;

 	snprint(addr, sizeof(addr), "tcp!%s!%s", host, port);