Function proxy_handler

modules/proxy/mod_proxy.c:1213–1552

/* Invoke handler */

static int proxy_handler(request_rec *r)
{
    char *uri, *scheme, *p;
    const char *p2;
    void *sconf = r->server->module_config;
    proxy_server_conf *conf = (proxy_server_conf *)
        ap_get_module_config(sconf, &proxy_module);
    apr_array_header_t *proxies = conf->proxies;
    struct proxy_remote *ents = (struct proxy_remote *) proxies->elts;
    int rc = DECLINED, access_status, i;
    int direct_connect = 0;
    const char *str;
    apr_int64_t maxfwd;
    proxy_balancer *balancer = NULL;
    proxy_worker *worker = NULL;
    int attempts = 0, max_attempts = 0;
    struct dirconn_entry *list = (struct dirconn_entry *)conf->dirconn->elts;
    int saved_status;

    /* is this for us? */
    if (!r->filename) {
        return DECLINED;
    }

    /* We may have forced the proxy handler via config or .htaccess */
    if (!r->proxyreq && r->handler && strncmp(r->handler, "proxy:", 6) == 0) {
        char *old_filename = r->filename;

        r->proxyreq = PROXYREQ_REVERSE;
        r->filename = apr_pstrcat(r->pool, r->handler, r->filename, NULL);
        apr_table_setn(r->notes, "proxy-sethandler", "1");

        /* Still need to canonicalize r->filename */
        rc = ap_proxy_canon_url(r);
        if (rc != OK) {
            r->filename = old_filename;
            r->proxyreq = 0;
        }
    }
    else if (r->proxyreq && strncmp(r->filename, "proxy:", 6) == 0) {
        apr_table_unset(r->notes, "proxy-sethandler");
        rc = OK;
    }
    if (rc != OK) {
        return rc;
    }

    uri = r->filename + 6;
    p = strchr(uri, ':');
    if (p == NULL) {
        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01141)
                      "proxy_handler no URL in %s", r->filename);
        return HTTP_BAD_REQUEST;
    }
    scheme = apr_pstrmemdup(r->pool, uri, p - uri);

    /* handle max-forwards / OPTIONS / TRACE */
    if ((str = apr_table_get(r->headers_in, "Max-Forwards"))) {