Introducing a --host option to allow using (n) subdomains

[manuelbieh]

Fixes #31

Example usage:
$ node bin/server --port 1234 --host multi.levels.deep.mydomain.com

Client:

$ lt --port 80 --host http://multi.levels.deep.mydomain.com:1234
your url is: http://ypxwyyefij.multi.levels.deep.mydomain.com:1234

Also allows usage of sub-sub[-sub[...]] domains:
$ node bin/server --port 1234 --host levels.deep.mydomain.com

Client:

$ lt --port 80 --host http://levels.deep.mydomain.com --subdomain one.two
your url is: http://one.two.levels.deep.mydomain.com:1234

Possible usecase (my particular case): debugging of "customer specific subdomain webapps" on a developer machine running localtunnel (exampleproject.manuel.tunnelserver.company.org). tunnelserver.company.org would be the tunnel server's url and exampleproject.manuel a custom subdomain pointing to a very specific project on my machine.

Imagine you needed access to a specific team on Slack (teamname.slack.com) on a developer's local machine (teamname.manuelsmachine.slack.com) from outside via localtunnel on a company's dev domain (teamname.manuelsmachine.localtunnel.slack.com). It would be as simple as node bin/server --host localtunnel.slack.com and lt --port 80 --host http://localtunnel.slack.com --subdomain teamname.manuelsmachine

(I'm not working for Slack, just using it as example since everybody knows the pattern behind Slack's URLs)

[mskims]

i made docker file for this pr.
https://hub.docker.com/r/ohwhos/localtunnel-server/

[zodman]

im testings and works +1

[zzh8829]

is anyone still working on this PR ?

[zodman]

the PR works!

[manuelbieh]

Looks like we're having a conflict here.

[wclr]

@manuelbieh I think docs need to be added.

@defunctzombie will you merge an publish new version with docker image please?

[arthot]

@manuelbieh, please, resolve so simple conflict on empty lines, otherwise this PR will stuck for another year 🤦‍♂️

[arthot]

@manuelbieh, you are 🚀. Resolved in 5 minutes 👍
@defunctzombie, now it's your turn. Please, merge this PR. One year of waiting.. It can close at least 4 issues #31, #51, #13, #40

[manuelbieh]

I usually respond within 5 minutes or never 😁😉

[wclr]

BTW I've made alternative implementation of this feature, some may check if needed #65

[chmduquesne]

When is this feature going to be integrated?

[taniki]

Using this PR. I now have a new error when trying to get a tunnel

  localtunnel server listening on port: 3000 +0ms
  localtunnel:server request /?new +1m
[error]	bookrc.js:10 Assignment to constant variable.
TypeError: Assignment to constant variable.
    at maybe_bounce (server.js:59:9)
    at Server.<anonymous> (server.js:330:52)
    at emitTwo (events.js:106:13)
    at Server.emit (events.js:191:7)
    at HTTPParser.parserOnIncoming [as onIncoming] (_http_server.js:546:12)
    at HTTPParser.parserOnHeadersComplete (_http_common.js:99:23)
TypeError: Assignment to constant variable.
    at maybe_bounce (server.js:59:9)
    at Server.<anonymous> (server.js:330:52)
    at emitTwo (events.js:106:13)
    at Server.emit (events.js:191:7)
    at HTTPParser.parserOnIncoming [as onIncoming] (_http_server.js:546:12)
    at HTTPParser.parserOnHeadersComplete (_http_common.js:99:23)

node version : 6.9.1
same with 9.2.0

[wclr]

@taniki try this one #65

[defunctzombie]

Closing in favor of #65. Will evaluate that PR as a potential enhancement.