Apache‘s reverse proxy is an act of an Apache webserver providing content from other webserver transparently. This is useful in many instances such as caching and mirroring, but it’s mostly used to serve websites that are hosted behind NAT or a firewall. A reverse proxy server routes connection addressed to the internal server, and the client sees the reverse proxy server itself as the origin server.

For example, Apache can be configured to serve URL‘s such as http://www.example.com/webapp to actually get the content from http://192.168.0.10/myapp, which is hosted from an internal network. This happens transparently and the user initially requesting http://www.example.com/webapp need not to be aware of what happens in the background.

Windows firewall settings can be managed from the Windows Defender Firewall interface in Control Panel. You can also manage Windows firewall configuration from the command prompt by using the …
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Being the language used in website designs, CSS is one of the language supported by Vim’s auto-complete feature.

To start using the feature, enter the following while in Vim’s command mode.

:set omnifunc=csscomplete#CompleteCSS

That will enable CSS auto-completion in Vim. To use it, press Ctrl + x followed by Ctrl + o while partially typing CSS codes.

The following is a sample screenshot.

You can use the arrow key to navigate through the list to choose your desired auto-complete suggestion.

From the man page, axel is a program that downloads a file from a FTP or HTTP server through multiple connection, each connection downloads its own part of the file.

Unlike most other programs, Axel downloads all the data directly to the destination file, using one single thread. It just saves some time at the end because the program doesn’t have to concatenate all the downloaded parts.

The following is an example of using axel to download a Linux kernel;

$ axel http://www.kernel.org/pub/linux/kernel/v2.2/linux-2.2.26.tar.bz2
Initializing download: http://www.kernel.org/pub/linux/kernel/v2.2/linux-2.2.26.tar.bz2
File size: 15754692 bytes
Opening output file linux-2.2.26.tar.bz2
State file found: 140628 bytes downloaded, 15614064 to go.
Starting download

[  1%] [0            1           2            3           ] [  17.3KB/s] [14:38]

It accept the following options;

--max-speed=x           -s x    Specify maximum speed (bytes per second)
--num-connections=x     -n x    Specify maximum number of connections
--output=f              -o f    Specify local output file
--search[=x]            -S [x]  Search for mirrors and download from x servers
--no-proxy              -N      Just don't use any proxy server
--quiet                 -q      Leave stdout alone
--verbose               -v      More status information
--alternate             -a      Alternate progress indicator

Vim is able to auto-complete syntax for some of the most popular programming languages, but it’s not enabled by default.

While in command mode, enter the following

:set omnifunc=phpcomplete#CompletePHP

To start using PHP auto completion, press the Ctrl + x followed by Ctrl + o keys while writing some PHP functions.

Below is an example screenshot when pressing Ctrl + x followed by Ctrl + o after typing dat

Do note the function description provided at the top of the screen.

You need to enable either the SQLite or PDO_SQLite extension for the profiler to run properly.

sudo apt-get install php5-sqlite

restart apache

Beginning version 7, Vim started to introduce its auto-complete feature. By default it works by being able to auto-complete words that already existed in the file being edited. If enabled, it can also auto-complete syntax for various programming languages.

To use the Vim auto-complete feature, just hit Ctrl + n while in insert mode, and you’ll get a list of word suggestions as in the following example;

To make the list cycle backwards, hit Ctrl + p. You can also use the arrow keys to move up and down the list.

SSH is by default configured to allow password login. You can disable password authentication if you’re in favour of public key authentication by following these steps;

1. Set PasswordAuthentication to no in /etc/ssh/sshd_config

   PasswordAuthentication no

2. Reload or restart SSH

   How to restart SSH service

Certain SSH server is configured to not allow root login mainly due to security and audit reason. You can disallow root login to your server with these simple steps;

1. Set PermitRootLogin to no in /etc/ssh/sshd_config

   PasswordAuthentication no

2. Reload or restart SSH

   How to restart SSH service