composer config --list --global          //this will get the composer home path.
[home] /root/.composer                   //it's my composer home path.


composer config -g secure-http false
#修改全局文件(推荐)
composer config -g repo.packagist composer https://packagist.phpcomposer.com

#修改当前配置文件
composer config repo.packagist composer https://packagist.phpcomposer.com

composer.json 文件修改后

{
    "repositories": {
        "packagist": {
            "type": "composer",
            "url": "https://packagist.phpcomposer.com"
        }
    }
}

全局设置下面的几个文件设置是全局的，修改时需要root权限
/etc/paths

Apache
<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews
    </IfModule>
    Options +FollowSymLinks
    RewriteEngine On

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)/$ /$1 [L,R=301]

    # Handle Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]

    # Handle Authorization Header
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
</IfModule>


<VirtualHost *:80>
    ServerAdmin ad@x.com
    DocumentRoot "/Library/WebServer/Documents/laravel54/public
    ServerName x.com
    ErrorLog "/private/var/log/apache2/x.com-error_log"
    CustomLog "/private/var/log/apache2/x.com-access_log" common

    <Directory "/Library/WebServer/Documents/laravel54/public">
        Options Indexes FollowSymLinks MultiViews
        Order allow,deny
        allow from all
        AllowOverride all
    </Directory> 
</VirtualHost>

• https://laravel.com/docs/5.4
• http://www.golaravel.com/laravel/docs/5.1/installation/
• http://laravelacademy.org/resources-download
• https://www.exuan.org/2016/03/22/composer-downloader-transportException/
• https://pkg.phpcomposer.com/
• http://blog.csdn.net/huang2017/article/details/68945840
• https://segmentfault.com/a/1190000004564924
• http://www.cnblogs.com/wish123/p/4145974.html