Bucle de redireccionamiento de barniz

Question

Lo he probado con muchas configuraciones de barniz y siempre experimento el mismo bucle de redireccionamiento; después de que barniz se ejecuta durante un par de horas, algunas páginas muestran el mensaje: The page isn't redirecting properlyen Firefox.

Como muestra la imagen, la primera solicitud devuelve un código de estado 301, el resto son 302, no tengo idea de dónde está este código de estado 302, en mi configuración de nginx tengo:

# We don't want someone to visit a default site via IP
# So we catch all non-defined Hosts or blank hosts here
# the default listen will cause this server block to be used
# when no matching hostname can be found in other server blocks
server {
    # use default instead for nginx 0.7.x, default_server for 0.8.x+
    listen 81 default_server;
    # if no listen is specified, all IPv4 interfaces on port 80 are listened to
    # to listen on both IPv4 and IPv6 as well, listen [::] and 0.0.0.0 must be specified. 
    server_name _;
    return 301 $scheme://elbauldelprogramador.com$request_uri;
}

En sitios habilitados/mysite:

server {
    listen 127.0.0.1:81;
    server_name www.elbauldelprogramador.com;
    return 301 $scheme://elbauldelprogramador.com$request_uri;
}
server {
    listen 127.0.0.1:81;
    server_name elbauldelprogramador.com

    #rest of configuration
}

¿Quizás esas redirecciones 301 son el problema? Mi configuración de barniz actual es esta (aunque sucede con todas las configuraciones que probé).

# Enter your backend Wordpress site here.
backend default {
    .host = "127.0.0.1"; # XXX CHANGE THIS
    .port = "81";        # (and maybe this)
    .connect_timeout = 60s;
    .first_byte_timeout = 60s;
    .between_bytes_timeout = 60s;
    .max_connections = 800;
}   

acl purge {
    "127.0.0.1";
}

# Drop any cookies sent to Wordpress.
sub vcl_recv {
    if (req.request == "PURGE") {
        if (!client.ip ~ purge) {
            error 405 "Not allowed.";
        }
        return (lookup);
    }

    if (req.http.host ~ "(?i)^(www.)?elbauldelprogramador.com") {
        set req.http.host = "elbauldelprogramador.com";
    }

    # Normalize encoding
    if (req.http.Accept-Encoding) {
        if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") {
            # No point in compressing these
            remove req.http.Accept-Encoding;
        } elsif (req.http.Accept-Encoding ~ "gzip") {
            set req.http.Accept-Encoding = "gzip";
        } elsif (req.http.Accept-Encoding ~ "deflate") {
            set req.http.Accept-Encoding = "deflate";
        } else {
            # unknown algorithm
            remove req.http.Accept-Encoding;
        }
    }
    if (!(req.url ~ "wp-(login|admin|cron)")) {
        unset req.http.cookie;
    }
}

# Drop any cookies Wordpress tries to send back to the client.
sub vcl_fetch {
    if (!(req.url ~ "wp-(login|admin)")) {
        unset beresp.http.set-cookie;
    }
}

sub vcl_hit {
    if (req.request == "PURGE") {
        purge;
        error 200 "Purged.";
    }
}

sub vcl_miss {
    if (req.request == "PURGE") {
        purge;
        error 200 "Purged.";
    }
}