nginx-request-logging

Custom request logging in Nginx uses log_format definitions in the http block to specify which fields to capture, then applies them to server blocks via the access_log directive. Define your format with variables like $remote_addr, $request, $status, then reference it by name in access_log statements to route logs to files.

Rate limiting in Nginx uses limit_req_zone directives in the http block to define zones with connection thresholds, then applies them via limit_req in server or location blocks. This prevents excessive requests by tracking clients and enforcing request-per-second caps, protecting backend services from overload.

Yes, use error_page directives in server or location blocks to map HTTP status codes to custom response files or URIs. Nginx serves your custom HTML when errors occur, improving user experience and enabling branded error handling across different server contexts.

Run nginx -t from the command line to syntax-check your configuration file without starting or reloading the server. This catches errors in log formats, rate-limit zones, server blocks, and other directives before they impact production traffic.

Rate limiting at the Nginx layer drops excess requests before they reach your application, reducing backend CPU and memory load. It's faster, applies uniformly across multiple backends, and protects against DDoS patterns without requiring application code changes.