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Introduces a pluggable fetcher abstraction that allows routes to opt into custom fetch logic instead of the default HTTP passthrough. - Add Fetcher interface (types.ts) and a registry (index.ts) with built-in 'default' and 'pyth-pro' fetchers - pyth-pro fetcher: uses @pythnetwork/pyth-lazer-sdk to call getLatestPrice or getPrice based on the upstream URL path (/v1/latest_price vs /v1/price), caches PythLazerClient per base-URL+token, and validates that timestamp (whole-second microseconds) is present for the /v1/price endpoint - proxy-server: route handler selects fetcher by name from the route config, falls back to defaultFetcher when none is specified - config-parser: adds optional 'fetcher' field to RouteSchema; skips unused path-variable warnings for custom fetcher routes - headers util and verify-with-retry improvements
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