update default fontURL

[pkra]

https://github.com/mathjax/MathJax-node/blob/master/lib/main.js#L41

[pkra]

While writing a test, I realized the fontURL cannot be reconfigured. I'll add that to a PR.

[dpvc]

There are many things that can't be reconfigured. The configuration must be done before any typesetting is done, and can't be changed. If you need to change configurations, you must call mjAPI.start() again in order to restart MathJax.

[pkra]

I'm fine moving this to start() but it currently won't re-configure this either since CHTMLSTYLES is generated at the first startup.

[dpvc]

It is set within the AuthorInit function so should be reset when the new MathJax starts up. Unfortunately, calling start() with the callback of a previous typeset() call messes up the synchronization, and the new MathJax hasn't started up yet when the next typeset() is run, so you get the old one again.

You can get around this in one of two ways: either enclose your start() and typeset() calls in a setTimeout() call, so that they will run after the callback completes; or modify main.js as follows:

• Swap lines 776 and 777

• Replace line 778 by

    if (serverState === STATE.READY) StartQueue();
  

• Move line 812 to after the close brace at line 813.

That will allow you to call start() from within a typeset() callback.

I've made a branch (issue323) that includes these changes.