Post Request Time Out (no replies)

Hi i create a module which is parse a post request.
But it able to parse first post but other are getting time out what's the problem?

Registering parser by ngx_http_read_client_request_body(r, ngx_http_ab_router_post_read);

and try to parse request by

b = r->request_body->bufs->buf;
if (ngx_buf_size(b) == 0) {
return NGX_OK;
}

buf = b->pos;
last = b->last;

please help me