ShenFeng312 commented on issue #10620:
URL: https://github.com/apache/apisix/issues/10620#issuecomment-2144206197
The bug is caused by differences between OpenResty and Nginx.
In Nginx's `ngx_http_upstream.c`:
``` c++
if (!u->request_body_sent) {
u->request_body_sent = 1;
if (u->header_sent) {
return;
}
ngx_add_timer(c->read, u->conf->read_timeout);
if (c->read->ready) {
#if (T_NGX_MULTI_UPSTREAM)
if (u->multi) {
ngx_http_multi_upstream_read_handler(c);
return;
}
#endif
ngx_http_upstream_process_header(r, u);
return;
}
}
```
The added `read_timeout` is `u->conf->read_timeout`.
However, in OpenResty, due to the `HAVE_NGX_UPSTREAM_TIMEOUT_FIELDS` macro,
OpenResty directly uses `u->read_timeout`.
But `the ngx_multi_upstream_module` does not account for this difference.
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