the buffer used to send PROXY protocol header to upstream do not reused in stream module

[qlees@…]

function ngx_stream_proxy_init_upstream in ngx_stream_proxy_module.c, line840.

the buffer(cl->buf) used to send PROXY protocol header to upstream, while cl->buf->start and cl->buf->end is set to be zero, so the buffer is unable to reuse.
Is this a feature or mistake?

    if (u->proxy_protocol) {
        ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0,
                       "stream proxy add PROXY protocol header");

        cl = ngx_chain_get_free_buf(c->pool, &u->free);
        if (cl == NULL) {
            ngx_stream_proxy_finalize(s, NGX_STREAM_INTERNAL_SERVER_ERROR);
            return;
        }

        p = ngx_pnalloc(c->pool, NGX_PROXY_PROTOCOL_MAX_HEADER);
        if (p == NULL) {
            ngx_stream_proxy_finalize(s, NGX_STREAM_INTERNAL_SERVER_ERROR);
            return;
        }

        cl->buf->pos = p;

        p = ngx_proxy_protocol_write(c, p, p + NGX_PROXY_PROTOCOL_MAX_HEADER);
        if (p == NULL) {
            ngx_stream_proxy_finalize(s, NGX_STREAM_INTERNAL_SERVER_ERROR);
            return;
        }

        cl->buf->last = p;
        cl->buf->temporary = 1;
        cl->buf->flush = 0;
        cl->buf->last_buf = 0;
        cl->buf->tag = (ngx_buf_tag_t) &ngx_stream_proxy_module;

        cl->next = u->upstream_out;
        u->upstream_out = cl;

        u->proxy_protocol = 0;
    }

[Maxim Dounin]

Doesn't look like a bug to me. For questions, consider using ​support options available.