Laravel 5.7 - Installation sous Windows 7 avec proxy

Bonjour,

Je tente d'installer Laravel avec composer mais j'ai des erreurs liées au proxy.

J'obtiens en ligne de commande :

Code:

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php "E:\Sites\composer.phar" diag
 
 
Checking platform settings: OK
Checking git settings: OK
Checking http connectivity to packagist: WARNING
[Composer\Downloader\TransportException] The "http://repo.packagist.org/packages.json" file could not be downloaded (HTTP/1.1 407 Proxy Authentication Required)
Checking https connectivity to packagist: WARNING
[Composer\Downloader\TransportException] The "https://repo.packagist.org/packages.json" file could not be downloaded: failed to open stream: Cannot connect to HTTPS server through proxy
Checking HTTP proxy: FAIL
[Composer\Downloader\TransportException] The "https://repo.packagist.org/packages.json" file could not be downloaded: failed to open stream: Cannot connect to HTTPS server through proxy
Checking HTTP proxy support for request_fulluri: WARNING
Unable to assess the situation, maybe packagist.org is down (The "http://repo.packagist.org/packages.json" file could not be downloaded (HTTP/1.1 407 Proxy Authentication Required))
Checking HTTPS proxy support for request_fulluri: WARNING
Unable to assess the situation, maybe github is down (The "https://api.github.com/repos/Seldaek/jsonlint/zipball/1.0.0" file could not be downloaded: failed to open stream: Cannot connect to HTTPS server through proxy)
Checking github.com rate limit: FAIL
[Composer\Downloader\TransportException] The "https://api.github.com/rate_limit" file could not be downloaded: failed to open stream: Cannot connect to HTTPS server through proxy
Checking disk free space: OK
Checking pubkeys:
Tags Public Key Fingerprint: 57815BA2 .........
Dev Public Key Fingerprint: 4AC45767 .........
OK
Checking composer version:
 
  [Composer\Downloader\TransportException]
  The "https://getcomposer.org/versions" file could not be downloaded: failed
   to open stream: Cannot connect to HTTPS server through proxy
 
 
diagnose

J'ai fait de nombreuses recherches et défini les variables d'environnement comme préconisé
sous cette forme

Code:

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set https_proxy="http://proxy_ip:proxy_port"
set http_proxy="http://proxy_ip:proxy_port"

ou celle-ci

Code:

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set https_proxy=http://proxy_ip:proxy_port
set http_proxy=http://proxy_ip:proxy_port

ou encore celle-ci

Code:

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set HTTPS_PROXY=http://proxy_ip:proxy_port
set HTTP_PROXY=http://proxy_ip:proxy_port

ou encore celle-ci

Code:

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set HTTPS_PROXY=http://user:password@proxy_ip:proxy_port
set HTTP_PROXY=http://user:password@proxy_ip:proxy_port

ou encore celle-ci

Code:

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set https_proxy=http://user:password@proxy_ip:proxy_port
set http_proxy=http://user:password@proxy_ip:proxy_port

J'ai changé le mot de passe pour ne pas avoir de souci avec l'encodage des caractères spéciaux.
Rien n'y fait.

Je suis à court de solution.

Qui aurait une idée ?