我在安装laravel时遇到问题

Question

我在安装laravel时遇到问题。我在site上遵循了前两种方法(composer global require "laravel/installer=~1.1") and (composer create-project laravel/laravel --prefer-dist)，但他们失败了。 我想在浏览论坛时我需要输出我的结果来构建诊断......

Checking platform settings: OK
Checking git settings: OK
Checking http connectivity: OK
Checking HTTP proxy: OK
Checking HTTP proxy support for request_fulluri: FAIL
Unable to assert the situation, maybe packagist.org is down (The "http://packagist.org/packages.json" file could not be downloaded (HTTP/1.0 400 Bad Request))
Checking HTTPS proxy support for request_fulluri: OK
Checking disk free space: OK
Checking composer version: OK

1. 我想知道为什么我不能用这两种方法安装laravel。
2. 我正在使用代理。是。但我不知道reques_fulluri的含义及其作用。