I assumed the 25000 was a typo for 2500.  That might have been wrong?  Looking at the code they both look like ms.

@dinic is there a reason that the `ngx_msec_t fetch_timeout` argument to `NgxUrlAsyncFetcher()` was set to 25000 (25 seconds) when the `int64 timeout_ms` argument to `SerfUrlAsyncFetcher()` was set to 2500 (2.5 seconds)?