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Option to enable fall-through on 404 error

Open Administrator requested to merge github/fork/aral/404-fallthrough into master

Created by: aral

Use case:

  • I’m proxying an app (Hugo)
  • If a URL does not exist there, I want to serve it from an older version of the site

I’ve modified http-proxy-middleware to enable it to fall-through to the middleware chain (see WIP PR, which depends on this one) when it encounters a 404 but without this PR, node-http-proxy already writes out the headers and so we cannot serve the fallback content.

Further context: https://github.com/chimurai/http-proxy-middleware/issues/248#

Summary of merge request

  • Add fallthrough option to the context. If present, 404 responses from the target will not be handled by node-http-proxy so that they can fall through to the middleware chain by the consumer.