First of all I apologize for my English and thank you in advance for any response. I was reading several solutions about the configuration of composer behind a proxy but the truth is that I still have problems. Already create the environment variables
HTTP_PROXY_REQUEST_FULLURI = false
HTTPS_PROXY_REQUEST_FULLURI = false
HTTP_PROXY = my_http_proxy: proxy_port
HTTPS_PROXY = my_https_proxy: proxy_port
But I get the following problem when I use composer: The "https://packagist.org/packages.json" file could not be downloaded: failed to open stream: Cannot connect to HTTPS server through proxy https://packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date
[Composer\Downloader\TransportException]
The 'http://packagist.org/p/provider- 2013%24c23e27d4ef97dede5bbe3fe1d348566
bd1a463ccbe767186c51beab5436c9bad.json' URL could not be accessed: HTTP/1.1
400 Bad Request
Again thank you for any help and time you can give me
Maybe your SO need define variables in lower case, or maybe you need define user and password for your proxy.
Another thing in my case was I didn't set http_proxy variable with "http://" part like below:
http_proxy = http://username:password@ip:port
and
https_proxy = http://username:password@ip:port