Thanks!

this blew code is in limit_req module:

static ngx_int_t
ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
u_char *data, size_t len, ngx_uint_t *ep)
{
...................................................................
tp = ngx_timeofday();

now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
ms = (ngx_msec_int_t) (now - lr->last);

excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;

if (excess < 0) {
excess = 0;
}

*ep = excess;

if ((ngx_uint_t) excess > lrcf->burst) {
return NGX_BUSY;
}
................................................
}

in this code , while two or more request in one milliseconds , excess will
be greater than 0, in addition burst is 0 in default , therefore
ngx_http_limit_req_lookup
will return NGX_BUSY, nginx will send 503 to client. but this situation is
not send 503 to client. this is limit_req's bug?

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