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I am running Rails 6.1.3 with webpacker 6.0.0.beta.6

When I run rails webpacker:compile, I can see the .js files as well as .map files emitted to public/packs/js.

The last line of one of the .js files says //# sourceMappingURL=application-b3a380c16a7bf12276e7.js.map and that map file is indeed in the public/packs/js directory.

However, when I load localhost:3000/foo/bar into the browser, I get the message in the console

DevTools failed to load SourceMap: Could not load content for http://localhost:3000/foo/application-b3a380c16a7bf12276e7.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE.

What do I need to do to have devtools request the correct location, which is: http://localhost:3000/packs/js/application-e0c3882abd2e74c48a38.js.map?

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