figure it out, would jump one position for 3 bytes separator
Posted at Nginx Forum:
https://forum.nginx.org/read.php?2,268369,268379#msg-268379
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also ngx_http_upstream_response_time_variable and
ngx_http_upstream_response_length_variable, + 2 for separator
if (state[i].peer) {
*p++ = ',';
*p++ = ' ';
} else {
*p++ = ' ';
*p++ = ':';
*p++ = ' ';
if (++i == r->
ngx_http_upstream_status_variable
len = r->upstream_states->nelts * (3 + 2);
write status to string, one status str len would be 3 in most case, like
200, 302, 404
but if upstream multi times, may be add ' : ' as separator
so, string len may be nelts*3 + (nelts-1)*3 = 6nelts - 3 != nelts * (
