Solução de problemas:muitos redirecionamentos

Firefox

Chrome

curl -svILk https://www.example.com
 ....
 * Maximum (50) redirects followed

O primeiro passo:cache e cookies

Usando ferramentas de desenvolvedor para loops de redirecionamento

Ferramentas do desenvolvedor no Firefox

Usando cURL para loops de redirecionamento

#!/bin/bash
 echo
 for domain in $@; do
 echo --------------------
 echo $domain
 echo --------------------
 curl -sILk $domain | egrep 'HTTP|Loc' | sed 's/Loc/ -> Loc/g'
 echo
 done

chmod +x redirects.sh

Exemplo de saída

./redirects.sh liquidweb.com
 --------------------
 liquidweb.com
 --------------------
 HTTP/1.1 301 Moved Permanently
 -> Location: https://liquidweb.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: https://www.liquidweb.com/
 HTTP/1.1 200 OK

Exemplo de redirecionamento infinito de HTTP para HTTPS

./redirects.sh http://www.example.com
 --------------------
 http://www.example.com
 --------------------
 HTTP/1.1 301 Moved Permanently
 -> Location: https://www.example.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: http://www.example.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: https://www.example.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: http://www.example.com/
 HTTP/1.1 301 Moved Permanently
 ....
 -> Location: https://www.example.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: http://www.example.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: https://www.example.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: http://www.example.com/
 HTTP/1.1 301 Moved Permanently
 -> Location: https://www.example.com/

Uma observação lateral sobre os tipos de redirecionamento

Redirecionamentos no arquivo .htaccess

Forçar HTTPS

RewriteEngine On
 RewriteCond %{HTTPS} off
 RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

Forçar HTTPS:quando atrás de um balanceador de carga ou proxy (CloudFlare/Incapsula/Sucuri/etc.)

RewriteEngine On
 RewriteCond %{HTTPS} off
 RewriteCond %{HTTP:X-Forwarded-Proto} =http
 RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

Forçar não www

RewriteEngine On
 RewriteCond %{HTTP_HOST} ^www\. [NC]
 RewriteRule (.*) http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

Forçar www

RewriteEngine On
 RewriteCond %{HTTP_HOST} !^www\. [NC]
 RewriteRule (.*) http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

WordPress

grep DB wp-config.php

define('DB_NAME', 'wordpress_database');
 define('DB_USER', 'wordpress_username');
 define('DB_PASSWORD', 'Password');
 define('DB_HOST', 'localhost');
 define('DB_CHARSET', 'utf8');
 define('DB_COLLATE', '');

A tabela wp_options

mysql -e 'show tables' wordpress_database | grep options

prefix_options

Verificando o URL configurado

mysql -e 'select * from wp_options where option_name rlike "home|siteurl"' wordpress_database
 +-----------+-------------+----------------------------------+----------+
 | option_id | option_name | option_value                     | autoload |
 +-----------+-------------+----------------------------------+----------+
 |        36 | home        | http://www.example.com           | yes |
 |         1 | siteurl     | http://www.example.com           | yes |
 +-----------+-------------+----------------------------------+----------+

Atualizando o URL configurado

mysql -e 'update wp_options set option_value="https://www.example.com" where option_name rlike "home|siteurl"' wordpress_database

Magento

# Version 1.x
 app/etc/local.xml

# Version 2.x
 app/etc/env.php

A tabela core_config_data

mysql -e 'select * from core_config_data where path rlike "base_url"' magento_database
 +-----------+---------+----------+-----------------------+----------------------------+
 | config_id | scope   | scope_id | path             | value |
 +-----------+---------+----------+-----------------------+----------------------------+
 |         3 | default |        0 | web/unsecure/base_url | http://www.example.com     |
 |         4 | default |        0 | web/secure/base_url   | http://www.example.com   |
 +-----------+---------+----------+-----------------------+----------------------------+

mysql -e 'update core_config_data set value="https://www.example.com" where path rlike "web/.*/base_url"' magento_database

Resumindo tudo