Package util

This should be moved to log package.

This should be moved to log package.

Checks whether file exists, checks whether it is a directory.

EnvVar returns an error, if the key is not present.

Required environment var terminates the program if the env var is not set.

Checks whether file exists.

Stripping subdomains Last two "." delimited tokens of hostname xx1.shop.wsj.com => wsj.com.

Get a http client blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts/.

Get a http server thenewstack.io/building-a-web-server-in-go/ blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts/.

Func isSpacey is a shortcut func.

Loads a file relative to app dir.

in addition - extensions are respected and cleansed.

NewFlags returns a slice of settings.

All kinds of newlines, tabs and double spaces are reduced to single space.

subdomain1.host.com/dir1 is reformed to host.com/subdomain1/dir1 except for www.host.com.

ParseAndSaveUploaded is a convenience func to process uploaded files.

Returns the the source file path.

StackTrace returns the call stack as slice of strings First arg => level init Second arg => levels up Third arg => dirs of before source file.

StackTraceHTML returns StackTrace as a string embeddable into HTML.

StackTraceStr returns StackTrace as a string with new lines.

StripPrefix is a 'debug version' of http.StripPrefix; it logs the modified rewritten request elements; it also demonstrated, how to nest a http.Handler.

Prime data source is in the "dsn1" configuration map key.

Any slice element, that is contained in another slice element gets trimmed.

Implicitly contains removeProtokol() HostName gets reduced (www.

FlagT reads some command line value.

FlagsT is a slice of settings.