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To fix the 504 error, match the server timeout and PHP max_execution_time with your script's runtime. Also, check if your load balancer is causing the timeout.

Using Java servlets or frameworks like Spring Boot is a good option for dynamic filtering. GraalVM might also be worth exploring for multi-language support.

GCP's free tier can be tricky, and costs increase with higher usage. Try optimizing your instance or explore discounts to reduce expenses.