Server Side Swift with Vapor - Part 2: Hello World | Ray Wenderlich

doyle · March 5, 2018, 5:59am

Edit: I have a feeling I’m doing something wrong, I keep redoing the tutorial and getting new errors. I’ll try work out what I’m doing wrong sorry.

shogunkaramazov · March 5, 2018, 7:08am

@0xtim Can you please help with this when you get a chance? Thank you - much appreciated! :]

doyle · March 5, 2018, 7:24am

Yes sorry, all sorted and got it working now, I just confused myself with the “HelloVapor” project and “hello” page. Should have watched to the end of the vid first.

youareapp · March 6, 2018, 3:04pm

Can I build my Vapor 3 project on Ubuntu ECS ?

dricard · March 6, 2018, 6:54pm

I couldn’t make it work in a browser until I tried the solution found in this thread:

services.register { _ in 
  EngineServerConfig.detect(hostname: "127.0.0.1", port: 8080) 
}

Now it works with this port. Can anyone help me figure out what’s wrong and why localhost:8080 doesn’t work?

0xtim · March 7, 2018, 12:20am

@dricard have you got anything weird in your /etc/hosts file?

dricard · March 7, 2018, 1:48am

I’m sure I don’t know what’s supposed to be in there. Here what’s in it.

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1	localhost
255.255.255.255	broadcasthost
::1             localhost

Anything wrong with that?

0xtim · March 7, 2018, 2:18pm

@dricard bizarre! That looks completely valid

If you run ping localhost in terminal does it work? If you remove the solution you added and try running your application what gets printed in the console?

dricard · March 7, 2018, 4:37pm

Yes if I ping localhost it works. When I remove the solution and I run this is what I get in the console:

Migrating sqlite DB
Migrations complete
Server starting on http://localhost:8080

And when I load http://localhost:8080/hello I get this in Safari:

It does the same in Firefox:

With the solution:

Migrating sqlite DB
Migrations complete
Server starting on http://127.0.0.1:8080

And loading http://127.0.0.1:8080/hello in Safari works (I get ‘Hello World’).

0xtim · March 7, 2018, 5:16pm

That is bizarre! Does a curl -v http://localhost:8080/hello work at all?

0xtim · March 7, 2018, 5:50pm

Speaking to some others it may be an IPv6 issue - this should be fixed by the integration of Swift NIO soon

dricard · March 7, 2018, 5:56pm

This is what I get from the curl:

*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
> GET /hello HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.54.0
> Accept: */*
>
* Empty reply from server
* Connection #0 to host localhost left intact
curl: (52) Empty reply from server

Trying with the solution returns this instead:

*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET /hello HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Length: 13
< Content-Type: text/plain; charset=utf-8
< Date: Wed, 07 Mar 2018 17:55:05 GMT
<
* Connection #0 to host 127.0.0.1 left intact
Hello, world!

0xtim · March 7, 2018, 7:00pm

@dricard ok so it’s definitely preferring IPv6 over IPv4 - looks like there’s an issue around packets/streams for IPv6. The good news is this should be fixed pretty soon. As for why it is happening - if you add another line at the bottom of your /etc/hosts for 127.0.0.1 localhost to see if it picks that over IPv6 address - or wait for the fix with your workaround til then!

dricard · March 8, 2018, 8:08pm

@0xtim thanks for looking into this for me! I guess I’ll keep the workaround until this is resolved. Where should I look for info on a possible fix?

0xtim · March 8, 2018, 8:27pm

@dricard either the Vapor Slack or GitHub releases. I’ll ping you when NIO hits though anyway

lac_ekim · March 18, 2018, 5:09am

@0xtim hello bud…im running into a issue. everything is installed, Xcode toolchains is switched but it will not allow me to run the “vapor new HelloVapor --branch=beta”.

fahim · March 18, 2018, 5:28am

What is the error message you get? Knowing the error message could be useful in figuring out what is going on …

lac_ekim · March 18, 2018, 6:11am

got it working bud, TY though!

midtownkc · March 29, 2018, 6:21pm

I’ve got 4.1 installed and vapor, however I can’t get the web server to launch. I’ve deleted and recreated the app several times. I get the following error:

[ INFO ] Migrating ‘sqlite’ database (FluentProvider.swift:28)
[ INFO ] Preparing migration ‘Todo’ (MigrationContainer.swift:50)
[FluentError.reflectProperty: No property reflected for Swift.WritableKeyPath<App.Todo, Swift.Optional<Swift.Int>>] [/Users/maxfred/code/swift/vapor/HelloVapor/.build/checkouts/fluent.git-6251908308727715749/Sources/Fluent/Migration/Migration.swift:28:124]
Program ended with exit code: 1

0xtim · March 30, 2018, 10:23am

@midtownkc run vapor update there was a broken reflection API in Core that for some reason still is being used by the template - I’ll get that updated