fix: pipelining now actually works

src/http_loop/http_loop.c

@@ -22,7 +22,7 @@ bool http_loop_handle_request(event_loop_conn *conn) {
       return false;
     }
 
-    conn->rbuf_read += res;
+    conn->rbuf_read += ctx->req.len;
 
     // It's fun to respond with extremely specific error messages
     // https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/501