wiki/content/20201117114443-front_controller_configuration.md

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---
date: 2020-11-17
id: ad565d8b-8c81-45a0-9a4a-7c17feb8733e
title: Front Controller Configuration
---
# Description
Front controller behaviour can be configured using configuration
options. Pre PHP 7.4 there was a 20% penalty of doing this vs editing
the `index.php` file. However, PHP preloading[^1] negates this. Post PHP
7.4 configuration options can be used without a performance penalty.
# Syntax
``` yaml
# config/packages/framework.yaml
framework:
# use the HTTP Cache defaults
http_cache: true
# configure every HTTP Cache option
http_cache:
private_headers: ['Authorization', 'Cookie', 'MyCustomHeader']
default_ttl: 3600
allow_revalidate: true
stale_if_error: 600
# configure proxies to trust directly in the config file:
trusted_proxies: '127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16'
# or use an env var if this value is dynamic
trusted_proxies: '%env(TRUSTED_PROXIES)%'
# you can also define the trusted headers
trusted_headers: ['x-forwarded-all', '!x-forwarded-host', '!x-forwarded-prefix']
```
# Footnotes
[^1]: <https://www.php.net/manual/en/opcache.preloading.php>