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That doesn't make sense. Why would an ALB only support GET and POST and not the entire REST protocol?

Because it's old or has a whitelisted set of verbs that hasn't been updated since 1999.

Also a firewall usually operates at layer 4 not 7.

You are right many firewalls operate on layer 4, but there are also Web Application Firewalls like ModSecurity which inspect HTTP messages on Layer 7.

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