执行这个命令，搞了几个小时都没成功。发现是下载的地址有问题。

sudo pip3 install virtualenv 

错误提示：

Downloading/unpacking virtualenv   Cannot fetch index base URL https://pypi.python.org/simple/   Could not find any downloads that satisfy the requirement virtualenv Cleaning up... No distributions at all found for virtualenv Storing debug log for failure in /home/test/.pip/pip.log

强制命令用国内的源下载就好。

sudo pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple virtualenv

 

因为自己现在所在项目中很多url传值的地方都没有将值经过Server.UrlEncode编码而直接传值，所以造成在传值的时候存在大量错误。比如值中存在汉字，或者存在+,/等特殊符号时，接收到的值就和原来的传的值不一样了。所以我们在url传值时一定要将值经UrlEncode编码后再传，url的编码可参看本站：

Url编码与解码分析
但现在项目中已经存在大量的没有编码的情况该怎么办呢？一个一个去改的话，总会存一些没有改到的地方。所以打算添加IhttpModel类，在HTTP执行管线链中的第一个事件BeginRequest中对未编码的url参数进行编码。
示例如下：

注：本示例只起一个引子的作用，未列出所有特殊符号的替换。
我们在下面的示例中演示将url中的+号替换成"%2B"。因为直接传+号，接收到的值会是一个空格。
public class SHttpModule : IHttpModule

{

private List<Pair> _encodelist;

/// <summary>

/// 须经url编码的字符

/// </summary>

public List<Pair> EncodeList

{

    get

    {

        if (_encodelist == null)

        {

            _encodelist = new List<Pair>();

        }
 //在这个list中可以添加更多的须编码的字符

        _encodelist.Add(new Pair("+", "%2B"));
        return _encodelist;

    }

}
public void Init(HttpApplication HttpApplication)

{

    //BeginRequest事件为http执行管线链中第一个发生的事件，在这个事情中，我们可以将未经编码的特殊字符替代成编码后的字符，然后利用RewritePath方法重写url地址。

    HttpApplication.BeginRequest += new EventHandler(HttpApplication_BeginRequest);

}
void HttpApplication_BeginRequest(object sender, EventArgs e)

{

    HttpApplication Application = (HttpApplication)sender;

    HttpContext context = Application.Context;
    string path = Application.Request.Url.PathAndQuery;

    //因为url中的#有着特殊的意思，它代替页面将跳转到指定的锚文本上。所以在没有锚文本的情况下，是不应该出现#符号的。

    if (path.Contains("#"))

    {

        context.RewritePath("/出错页面");

    }
    bool isEncode = false;

    if (!path.Contains("%"))

    {

        foreach (Pair p in EncodeList)

        {

            if (path.Contains(p.First.ToString()))

            {

                path = path.Replace(p.First.ToString(), p.Second.ToString());

                isEncode = true;

            }

        }
        if (isEncode)

        {

            context.RewritePath(path);

        }

    }

}
public void Dispose()

{
}


当然，该方法会存在一些缺陷，比如经过RewritePath重写的url地址后会明显加重服务器cpu的负担。还有可能造成页面回发错误。具体解决方法与HttpModule模块的注册请查看本站：

如何通过RewritePath方法重写Url地址实现伪静态
本文来源于:http://www.lmwlove.com/ac/ID857

 Not Found The requested URL /index.php was not found on this server.

看提示是URL地址错误。原因是没有设置服务器地址重写，或者是设置了.htaccess文件，但没有打开重写功能。

解决办法是增加一个.htaccess文件，里面加上重写规则

RewriteEngine On

# The RewriteBase / instruction is commented. Remove the "#" to uncomment
# RewriteBase /

# Memory Limit
# php_value memory_limit 256M
# php_value max_execution_time 18000

# Disable Hotlinking
# Replace "domain.tld" with your domain name
# Don't forget to add a picture "thepic.gif" on your server 
# RewriteCond %{HTTP_REFERER} !^http://(.+\.)?domain\.tld/ [NC]
# RewriteCond %{HTTP_REFERER} !^$
# Solution 1 : Displays another picture from an URL
# RewriteRule .*\.(jpe?g|gif|bmp|png)$ http://www.domain.tld/thepic.gif [L]
# Solution 2 : Displays a 403 forbidden
# RewriteRule .*\.(jpe?g|gif|bmp|png)$ - [F]

# Forces the "www"
# RewriteCond %{HTTP_HOST} !^www\.yourdomain\.tld$ [NC]
# RewriteRule ^(.*)$ http://www.yourdomain.tld/$1 [QSA,L,R=301]

# Uncomment these lines to display the off.html page to other IP than the one bellow
# RewriteCond %{REMOTE_ADDR} !^127.0.0.1$
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteRule ^(.*) off.html

# DO NOT MODIFY ANY FOLLOWING LINE

# Iemis Rules
# Keep these lines even in maintenance mode, to have an access to the website
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|robots\.txt)
RewriteRule ^(.*)$ index.php?/$1
#RewriteCond %{HTTP_HOST} !^(www)\. [NC]
#RewriteRule ^(.*)$ index.php/$1 [L,QSA]
#RewriteRule ^(.*)$ index.php/$1 [L,P]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(application|modules|plugins|system|themes) index.php?/$1 [L]

.htaccess文件中index.php后面加了？ 

如若不行就把？去掉试试！

https://blog.csdn.net/wanganji5252/article/details/81736807 转载自这里

Not Found The requested URL /index.php was not found on this server.

看提示是URL地址错误。原因是没有设置服务器地址重写，或者是设置了.htaccess文件，但没有打开重写功能。

解决办法是增加一个.htaccess文件，里面加上重写规则



RewriteEngine On
 
# The RewriteBase / instruction is commented. Remove the "#" to uncomment
# RewriteBase /
 
# Memory Limit
# php_value memory_limit 256M
# php_value max_execution_time 18000
 
# Disable Hotlinking
# Replace "domain.tld" with your domain name
# Don't forget to add a picture "thepic.gif" on your server 
# RewriteCond %{HTTP_REFERER} !^http://(.+\.)?domain\.tld/ [NC]
# RewriteCond %{HTTP_REFERER} !^$
# Solution 1 : Displays another picture from an URL
# RewriteRule .*\.(jpe?g|gif|bmp|png)$ http://www.domain.tld/thepic.gif [L]
# Solution 2 : Displays a 403 forbidden
# RewriteRule .*\.(jpe?g|gif|bmp|png)$ - [F]
 
# Forces the "www"
# RewriteCond %{HTTP_HOST} !^www\.yourdomain\.tld$ [NC]
# RewriteRule ^(.*)$ http://www.yourdomain.tld/$1 [QSA,L,R=301]
 
# Uncomment these lines to display the off.html page to other IP than the one bellow
# RewriteCond %{REMOTE_ADDR} !^127.0.0.1$
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteRule ^(.*) off.html
 
# DO NOT MODIFY ANY FOLLOWING LINE
 
# Iemis Rules
# Keep these lines even in maintenance mode, to have an access to the website
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|robots\.txt)
RewriteRule ^(.*)$ index.php?/$1
#RewriteCond %{HTTP_HOST} !^(www)\. [NC]
#RewriteRule ^(.*)$ index.php/$1 [L,QSA]
#RewriteRule ^(.*)$ index.php/$1 [L,P]
 
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(application|modules|plugins|system|themes) index.php?/$1 [L]