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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/44092 In a setup where a device retrieves a bundle from `http://127.0.0.1:8081`, but this is tunnelled to a remote host with only an IPv6 stack (eg, FB dev servers), the host running the inspector-proxy will fail to fetch source or source maps from 127.0.0.1 despite typically being on the same host (indeed, process) as Metro. This causes a surprising inconsistency where using a bundler URL of `localhost` from the device results in source maps being inlined into `Debugger.scriptParsed`, but using a bundler URL of `127.0.0.1` causes inspector-proxy to fall back to preserving URLs, which are typically fetched lazily by CDT later. This should be unnecessary once we've implemented CDP `Network.loadNetworkResource` and removed `Debugger.scriptParsed` rewriting, but for now it brings IPv6 tunnelled servers in line with local servers. Changelog: [General][Changed] Inspector proxy: Rewrite 127.0.0.1 to localhost in source map URLs for better IPv4->IPv6 tunnelling support. Reviewed By: motiz88 Differential Revision: D56138742 fbshipit-source-id: b65c9cc8225a0ed54cf32171f640ef9e6408c762