gistfile1.txt

commit 2340bc1ef749df3494ed8897e438fd747e978b67 (origin/kazuho/travis-test, kazuho/travis-test)
Author: Kazuho Oku <kazuhooku@gmail.com>
Date:   Mon Mar 22 20:41:34 2021 +0900

    add assertion

diff --git a/lib/common/http1client.c b/lib/common/http1client.c
index 25c580d97..221c4b38b 100644
--- a/lib/common/http1client.c
+++ b/lib/common/http1client.c
@@ -577,6 +577,7 @@ static int do_write_req(h2o_httpclient_t *_client, h2o_iovec_t chunk, int is_end
     h2o_timer_unlink(&client->super._timeout);
 
     h2o_iovec_t iov = h2o_iovec_init(client->_body_buf_in_flight->bytes, client->_body_buf_in_flight->size);
+    assert(iov.len != 0);
     if (client->_is_chunked) {
         h2o_iovec_t bufs[3];
         size_t bytes;