Cutting and pasting wget links doesn't work

mhite

In various portions of the lab, cutting and pasting the wget links into the devcontainer terminal won't work. You will get a confusing message about https not being resolvable.

For example, in "Java Instrumentation Annotations (2)", there is the following text:

wget https:‌//github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v2.8.0/opentelemetry-javaagent.jar

When we use wget to retrieve it (using cut and paste), we see:

root@e1ba13773a5c:/workspaces/LFS148-code/exercises/automatic-instrumentation/initial/todobackend-springboot# wget https:‌//github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v2.8.0/opentelemetry-javaagent.jar
--2025-03-10 17:56:11--  ftp://https/%E2%80%8C//github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v2.8.0/opentelemetry-javaagent.jar
           => ‘opentelemetry-javaagent.jar.3’
Resolving https (https)... failed: Name or service not known.
wget: unable to resolve host address ‘https’

Specifically, take notice of the %E2%80%8C in the URL.

--2025-03-10 17:49:00-- ftp://https/%E2%80%8C//github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v2.8.0/opentelemetry-javaagent.jar

Apparently this is a zero width non-joiner character that has snuck its way into the lab text.

https://www.fileformat.info/info/unicode/char/200c/index.htm

It would be great if the lab was reviewed for accidental inclusion of these.

The workaround? Just type out the links manually.

arianehamm

@mhite ,

Thank you for flagging this. We are aware of this problem, but unfortunately it will persist for now. The inclusion of the characters is out of our control. Please type these lines manually or you may be able to paste on a notepad, which should remove the characters. Thank you for your patience and understanding.

Kind Regards,
Ariane
Linux Foundation Education Team

mhite

@arianehamm - no problem, also hit the issue on

https://trainingportal.linuxfoundation.org/learn/course/getting-started-with-opentelemetry-lfs148/hands-on-lab-manual-instrumentation-metrics/instruments-to-measure-golden-signals?page=6

ab -n 50000 -c 100 http:‌//localhost:5000/users

has some unexpected characters preventing it from being used as a cut-and-paste command.

marcorichetta

To add another workaroud, removing https:// worked for me

grimnir

I also had this issue, thanks for posting! Manually typed and it fixed it