What does this change do?
This commit the client to override the navigation menu setting
configured by the site temporarily based on the value of the
`navigation_menu` query param. The new query param replaces the old
`enable_sidebar` query param.
Why do we need this change?
The motivation here is to allow theme maintainers to quickly preview
what the site will look like with the various navigation menu site
setting.
This was previously disabled because of incompatibility with the ember-cli proxy. This commit fixes that incompatibility, and restores the development behaviour to match production.
There were three issues at play:
1. Our bootstrap-js addon handles the forwarding of most requests in the ember-cli proxy. This is not built to handle streaming responses. Solution: skip our custom request processing for `/message-bus/*` and use ember-cli's default `http-proxy`.
2. The request/response size-limiting middleware (`rawMiddleware`) would apply even to unhandled paths, causing request and response bodies to be buffered. Solution: skip it for any paths which are not handled by our custom addon.
3. Expressjs servers will buffer/compress responses. Solution: add `Cache-Control: no-transform` to message-bus responses. For now I've done this in development only, but it may be useful to add it to message-bus's default headers in future
The `Set-Cookie` header is an exceptional case where multiple values are allowed, and should not be joined into a single header. Because of its browser-focussed origins (where set-cookie is not visible), `fetch()` does not have a clean API for this. Instead we have to access the `raw()` data.
This fixes various authentication-related issues when developing via the Ember CLI proxy.
node-fetch is now a ES module, so it has to either imported with `import/from` syntax (which can't be used in addon's index.js) or using the dynamic `import()`
