Hey I m trying to test this on a google cloud server but I m

Question

Hey I m trying to test this on a google cloud server but I m getting this warning `WARN io netty util internal MacAddressUtil Failed to find a usable hardware address from the network interfaces using random bytes ` Which I think is not allowing it to work

Ian · Answer

Ah I ve seen that let me try to remember

Ian · Answer

Hmm is it actually preventing your app from working I think it s a Netty issue which kweb uses but from what I m reading it should be harmless

blakelee · Answer

Is says it s listening but I can t connect I figured that it is it s own webserver and I don t need to install apache or anything

Ian · Answer

That s correct Kweb is standalone

Ian · Answer

where are you trying to connect from Could it be a firewall issue

Ian · Answer

I have tested Kweb on Google Cloud but it was a few months ago

Ian · Answer

I think this is the issue <https github com netty netty issues 3490>

blakelee · Answer

I m trying to connect with the external ip from the vm console I can check the firewall rules So far it has http https traffic enabled

Ian · Answer

as an experiment it might be worth checking using curl from the command line

Ian · Answer

obviously kweb won t like this because curl doesn t support javascript but you should at least pull down some HTML

Ian · Answer

command line on the google cloud instance that is

Ian · Answer

you ve configured kweb s port to 80

blakelee · Answer

yup

blakelee · Answer

It s just a simple hello world that works on my main computer

Ian · Answer

what is the console output from kweb you may need to set up a logger to get output

blakelee · Answer

I ll have to recompile it to get the logs to see if anything is happening

Ian · Answer

Ok unfortunately I think that might be necessary to diagnose further

blakelee · Answer

I did `curl 35 197 37 165` and nothing I ll get back to you with the logs and see what it says

Ian · Answer

But rest assured that I ve got kweb working on Google Cloud in the past it s probably something silly slightly smiling face

blakelee · Answer

thanks for being quick with the responses

Ian · Answer

I aim to please wink

Ian · Answer

Thanks for trying kweb slightly smiling face

blakelee · Answer

I am running the server using `java jar name jar` I tried `curl 127 0 0 1 80` and it s saying connection refused confused even though it s in my processes as running I also did `debug = true` and nothing is popping up as even trying to connect

Ian · Answer

so there is no console output whatsoever Is there a logger implementation eg `compile group org slf4j name slf4j simple version 1 6 1 `

blakelee · Answer

I have that added All I have to do is just `debug = true` in the Kweb arguments

Ian · Answer

it should be producing console output with or without debug = true

Ian · Answer

after you type `java jar ` there is no console output whatsoever

blakelee · Answer

I get this ```630 main WARN io netty util internal MacAddressUtil Failed to find a usable hardware address from the network interfaces using random bytes 46 20 64 35 c9 bf 39 34 712 main INFO io kweb Kweb KWeb is listening on port 80```

Ian · Answer

hmmm

blakelee · Answer

Do I need to set the superuser bit

Ian · Answer

ah that might be it you might need to run it as sudo

Ian · Answer

because port 80 is reserved

Ian · Answer

surprised that doesn t generate an error though

blakelee · Answer

running it as sudo gave me some results when I use curl

Ian · Answer

that s promising

blakelee · Answer

Still can t connect from the external ip though

Ian · Answer

external ip but still from the machine itself

blakelee · Answer

just tested curl on my home machine It works when trying the external ip

blakelee · Answer

but in a browser it doesn t parse

Ian · Answer

what is the browser error

blakelee · Answer

It s saying it refused to connect

blakelee · Answer

`ERR CONNECTION REFUSED`

Ian · Answer

so curl works browser doesn t but curl and browser are doing the exact same thing

blakelee · Answer

aha

blakelee · Answer

typing the IP in the browser defaults to https

Ian · Answer

ah

blakelee · Answer

however I m only listening to port 80

Ian · Answer

bingo

blakelee · Answer

So the fix is a run as su and b make sure you re not using https

Ian · Answer

yeah kweb doesn t support HTTPS yet It should be very easy to add since netty does the work but hasn t been done yet

blakelee · Answer

Is there a way to redirect traffic to port 80 if it sees a call to 8080 has been made

blakelee · Answer

that might be something I can do in the VM instance

Ian · Answer

probably some kind of proxy that decodes encodes the HTTPS to HTTP

Ian · Answer

also probably not too hard to improve Kweb to do it if you are feeling a tad more ambitious

blakelee · Answer

without an ssl cert is there any encryption actually happening besides just saying https in front of the url

blakelee · Answer

I just might have to look at the source

blakelee · Answer

I m getting a ton better at Kotlin so it might make some sense

Ian · Answer

yes it will encrypt I think but they ll probably get a nasty browser warning

Ian · Answer

this is where the Netty magic happens <https github com kwebio core blob master src main kotlin io kweb Kweb kt>

Ian · Answer

You shouldn t need to grok everything going on in that class to extend support to include HTTPS it s mostly just understanding the points of contact with Ktor which wraps Netty

blakelee · Answer

I m wondering if I could make Kweb listen on a list of ports instead of just one

Ian · Answer

That class needs to be broken up and simplified

Ian · Answer

I don t see any reason it couldn t listen on multiple ports but note that there is more to HTTPS than just listening on the HTTPS port

Ian · Answer

browsers will probably throw a fit if they find a HTTP server on a HTTPS port as they should slightly smiling face

blakelee · Answer

I unfortunately don t know anything about how the web works My Networks class didn t do a great job haha

Ian · Answer

HTTPS is mostly just HTTP wrapped in an encryption layer

blakelee · Answer

So it essentially just needs to check if it s being contacted by the https port if it is decrypt it with a key that we provide

Ian · Answer

but I don t think you ll need to get into the weeds of that since Ktor should have explicit HTTPS support

Ian · Answer

Right but Ktor Netty should handle that

blakelee · Answer

I will look into Ktor then and see how it does it

Ian · Answer

you ll just need to tell it what port to listen to and make sure it knows it s supposed to be a HTTPS server not HTTP

Ian · Answer

then there are certs but again Ktor should handle that plumbing

Ian · Answer

the guys on < C0A974TJ9|ktor> are normally very friendly and helpful

Ian · Answer

And if you can create a kweb pull request I m more than happy to review and merge

blakelee · Answer

So is Kweb essentially a big wrapper so you don t have to deal with all the routing stuff of ktor Kweb let s you start on a website NOW instead of figuring out the details

blakelee · Answer

I ll do that I m trying to get employed so contributions will be great for prospective employers

Ian · Answer

Kweb occupies a funny place in the normal web software stack It s a bit like React + Node js because it straddles both web server and web browser

blakelee · Answer

That s why I m using it I hate JS so was looking for a Kotlin solution

blakelee · Answer

plus debugging is wayyyy easier

Ian · Answer

Ktor handles everything up to routing HTTP HTTPS kweb shits on top of that

Ian · Answer

erm sits

blakelee · Answer

haha

Ian · Answer

possible shits too time will tell wink

blakelee · Answer

dang dude you have your own wiki page I might be talking to the next linus torvalds of the web world

Ian · Answer

Nah I don t have a cool Finnish accent