2024-05-06 20:40:05 +00:00
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---
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2024-10-30 17:34:11 +00:00
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date: 2020-11-17
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2024-05-06 20:40:05 +00:00
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id: ad565d8b-8c81-45a0-9a4a-7c17feb8733e
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title: Front Controller Configuration
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---
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# Description
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Front controller behaviour can be configured using configuration
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options. Pre PHP 7.4 there was a 20% penalty of doing this vs editing
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the `index.php` file. However, PHP preloading[^1] negates this. Post PHP
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7.4 configuration options can be used without a performance penalty.
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# Syntax
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``` yaml
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# config/packages/framework.yaml
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framework:
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# use the HTTP Cache defaults
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http_cache: true
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# configure every HTTP Cache option
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http_cache:
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private_headers: ['Authorization', 'Cookie', 'MyCustomHeader']
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default_ttl: 3600
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allow_revalidate: true
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stale_if_error: 600
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# configure proxies to trust directly in the config file:
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trusted_proxies: '127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16'
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# or use an env var if this value is dynamic
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trusted_proxies: '%env(TRUSTED_PROXIES)%'
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# you can also define the trusted headers
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trusted_headers: ['x-forwarded-all', '!x-forwarded-host', '!x-forwarded-prefix']
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```
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# Footnotes
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[^1]: <https://www.php.net/manual/en/opcache.preloading.php>
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