Angular-cli: Why is sockjs included?

[StevePavlin]

Please provide us with the following information:

1. OS? Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
   Windows 10
2. Versions. Please run ng --version. If there's nothing outputted, please run
   in a Terminal: node --version and paste the result here:
   angular-cli: 1.0.0-beta.11-webpack
   node: 4.4.4
   os: win32 x64
3. Repro steps. Was this an app that wasn't created using the CLI? What change did you
   do on your code? etc.
   ng serve --prod
4. The log given by the failure. Normally this include a stack trace and some
   more information.
   N/A
5. Mention any other details that might be useful.
   Why is sockjs included in the production build? I can see a websocket connection made.

[TheLarkInn]

@StevePavlin Thanks for inquiring. SockJS is one of the pieces that powers webpack-dev-server. You may have also noticed that when you run ng serve in the new webpack branch, that you do not have anything produced in the /dist folder.

This is because webpack-dev-server uses memory-fs, an in memory filesystem to produce bundles virtually and then served to the dev server.

SockJS's purpose is to send websocket based messages to the dev-server to reload whenever changes are made to your project (triggering an incremental build).

You can see more details here.

[tylermassey]

@TheLarkInn That makes sense, but is SockJS needed for production builds, when users probably won't be using the webpack-dev-server?

I'm trying to serve my application with http-server, and I receive a constant stream of 404 errors like
"GET /sockjs-node/info?t=1470676240769" Error (404): "Not found"

It seems like SockJS shouldn't be used in this case.

[TheLarkInn]

Nope, SockJS (AKA webpack-dev-server) is only used for ng serve. If you run ng build you will not find any of these modules inside of your bundled src code.

[TheLarkInn]

We wanted to give people the option of still running a dev server, and viewing production results.

If you wanted to verify this you can run: ng build --prod and then run an http-server on the dist folder to see that the results will not include any sockjs code.

[tylermassey]

@TheLarkInn whoops! I think I accidentally ran the http-server on a development build instead of production. Thanks!

[StevePavlin]

All cleared up, thanks!

[blueberrynotblue]

omg..this's why I always got complier error when I import sockjs..

[raghulrajnkl]

i used remote dev machine and excute ng serve --host 0.0.0.0, i test in my local system , i got sockjs error, how to fix it?

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