Function ap_proxy_pre_request

modules/proxy/proxy_util.c:2623–2679

}

PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
                                        proxy_balancer **balancer,
                                        request_rec *r,
                                        proxy_server_conf *conf, char **url)
{
    int access_status;

    access_status = proxy_run_pre_request(worker, balancer, r, conf, url);
    if (access_status == DECLINED && *balancer == NULL) {
        /* UDS path stripped from *url by proxy_fixup() already */
        *worker = ap_proxy_get_worker_ex(r->pool, NULL, conf, *url,
                                         AP_PROXY_WORKER_NO_UDS);
        if (*worker) {
            ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
                          "%s: found worker %s for %s",
                          (*worker)->s->scheme, (*worker)->s->name_ex, *url);
            access_status = OK;
        }
        else if (r->proxyreq == PROXYREQ_PROXY) {
            if (conf->forward) {
                ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
                              "*: found forward proxy worker for %s", *url);
                *worker = conf->forward;
                access_status = OK;
                /*
                 * The forward worker does not keep connections alive, so
                 * ensure that mod_proxy_http does the correct thing
                 * regarding the Connection header in the request.
                 */
                apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1");
            }
        }
        else if (r->proxyreq == PROXYREQ_REVERSE) {
            if (conf->reverse) {
                ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
                              "*: using default reverse proxy worker for %s "
                              "(no keepalive)", *url);
                *worker = conf->reverse;
                access_status = OK;
                /*
                 * The reverse worker does not keep connections alive, so
                 * ensure that mod_proxy_http does the correct thing
                 * regarding the Connection header in the request.
                 */
                apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1");
            }
        }
    }
    else if (access_status == DECLINED && *balancer != NULL) {
        /* All the workers are busy */
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00934)
                      "all workers are busy.  Unable to serve %s", *url);
        access_status = HTTP_SERVICE_UNAVAILABLE;
    }

    return access_status;
}