Host/port binding and reverse proxy

[mhnagaoka]

• Adds command line configuration options to allow specifying the IP/port to bind to (--proxy-host and --proxy-port);
• Adds a command line options for activating a reverse proxy mode (i.e. forwards the requests to the same server, --reverse-proxy).

[kdzwinel]

Thank you! I'll take a look and merge it on weekend.

[kdzwinel]

these two dashes at the beginning - that's a typo, right?

[mhnagaoka]

Sorry for taking so much time to answer. :(

Nope, it is not a typo. They're necessary to propagate the command line arguments to electron.

$ npm start -- --proxy-port=8010 --proxy-host=0.0.0.0 --reverse-proxy=http://127.0.0.1:8081

> betwixt@0.0.0 start /home/mau/dev/betwixt
> electron main.js "--proxy-port=8010" "--proxy-host=0.0.0.0" "--reverse-proxy=http://127.0.0.1:8081"

From https://docs.npmjs.com/cli/run-script:

As of npm@2.0.0, you can use custom arguments when executing scripts. The special option -- is used by getopt to delimit the end of the options. npm will pass all the arguments after the -- directly to your script

[kdzwinel]

Thanks for explanation, I didn't know that!

[kdzwinel]

From what I've tested it works great. Please fix mentioned docs typo and I'll merge it.

[mhnagaoka]

@kdzwinel, not sure if you still want to merge this PR. Anyway, please let me know if you want me to rebase the branch.

[kdzwinel]

@mhnagaoka this time it took me a while to get back to you, sorry! The answer is: yes, absolutely! However, since I had to switch to mitm-proxy in order to support HTTPS (#31 - I'll merge it this week) you should rebase against that branch. It might be a bit challenging though (not sure how reverse proxy works with mitm-proxy), so if you won't find time to do it then I'll try.

[Guria]

Guys, it is 2018 here :)