Fixes #745 - Add proxy configuration and connection test script

[ralf401]

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[ralf401]

@YetAnotherGerrit

Could you please also have a look? This PR doesn't really solve the issue (which I moved from admin- to system docs, BTW).
What do you think, should we keep the issue open? If yes, we should maybe refine and plan it in a sprint, not sure.

[YetAnotherGerrit]

The more common and advised way to set a proxy via ENV variables is to use the lower case version http_proxy and https_proxy. Only specific applications require it to be HTTP_PROXY and HTTPS_PROXY. If Zammad does not care, I would prefer that we use the lower case version in the documentation. Alternativly add a comment, that it might be interesting to set both.

Ubuntuu e.g. advises for something like this:

export http_proxy=http://SERVER-IP_ODER_NAME:PORT
export https_proxy=http://SERVER-IP_ODER_NAME:PORT
export ftp_proxy=http://SERVER-IP_ODER_NAME:PORT
export HTTP_PROXY=$http_proxy
export HTTPS_PROXY=$https_proxy
export FTP_PROXY=$ftp_proxy

[ralf401]

The more common and advised way to set a proxy via ENV variables is to use the lower case version http_proxy and https_proxy. Only specific applications require it to be HTTP_PROXY and HTTPS_PROXY. If Zammad does not care, I would prefer that we use the lower case version in the documentation. Alternativly add a comment, that it might be interesting to set both.

Ubuntuu e.g. advises for something like this:

export http_proxy=http://SERVER-IP_ODER_NAME:PORT
export https_proxy=http://SERVER-IP_ODER_NAME:PORT
export ftp_proxy=http://SERVER-IP_ODER_NAME:PORT
export HTTP_PROXY=$http_proxy
export HTTPS_PROXY=$https_proxy
export FTP_PROXY=$ftp_proxy

Oh thanks, wasn't aware that this is even allowed for environment variables 😃 I added a hint with examples for the lower case variables.

But the question about how to proceed with the issue is still open 😜 I would tend to close it to have the repo clean, but if you consider the remaining parts that important, we could talk about how to tackle it.