Monthly Archives: April 2020

Linux, Other, Programming

Apache http to https redirect – use 307

Who knew that a simple thing like HTTP redirects would be so complicated? It turns out clients will just change POST to GET on 301 (Postman, curl, everyone?), same with 302 which really behaves like 303 and that is also an old implementation "bug". Yeah, seriously.

If you have a REST API with POST (or other non-GET) request endpoints (who doesn't?) this behaviour will completely destroy everything.  Many guides (top google results) out there for configuring Apache redirect do not mention this problem. The code of choice would be 308 Permanent Redirect but that is fairly new so I would not risk it, older clients don't know it exists. The only thing left is 307 which does not allow changing methods on redirect – exactly how it should be.

Solution:

<VirtualHost *:80>
    ServerName example.com
    Redirect 307 / https://example.com/
</VirtualHost>

 

Cen
GitHub
Eurobattle.net
Lagabuse.com
Bnetdocs
Linux, Programming, Script magic

Setting env variables with hyphen and running a program

Docker compose allows you very unrestrictive naming of your environment variables. It allows you to use hyphen and other "special" characters in variables names. When you need to use these variables in regular shell you are out of luck, bash and many other shells do not allow hyphens in variable names. But this is merely a shell restriction, so how to do it?

With env

env -i 'TZ=Europe/Berlin' \
'PORT=8080' \
'BASE-URL=http://localhost:8080' \
'DB[0]_CONNECTION-URL=jdbc:postgresql://localhost:5432/postgres' \
'DB[0]_USERNAME=username' \
'DB[0]_PASSWORD=password' java -jar myapp.jar

Note that env ignores all inherited env variables so you might need to redefine them:

env -i JAVA_HOME=$JAVA_HOME \
'TZ=Europe/Berlin' \ 
'PORT=8080' java -jar myapp.jar

 

Cen
GitHub
Eurobattle.net
Lagabuse.com
Bnetdocs