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Rewrite introduction section of User_Manual

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bel
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Overview
=====
Civetweb is small and easy to use web server. It is self-contained, and does
not require any external software to run.
Civetweb is small and easy to use web server.
It may be embedded into C/C++ host applications or used as a stand-alone
server. See `Embedding.md` for information on embedding civetweb into
host applications.
The stand-alone server is self-contained, and does not require any external
software to run. Some Windows users may need to install the
[Visual C++ Redistributable](http://www.microsoft.com/en-us/download/details.aspx?id=30679).
Installation
----
### Some Windows users may be the install the
[Visual C++ Redistributable for Visual Studio 2012](http://www.microsoft.com/en-us/download/details.aspx?id=30679)
On Windows, UNIX and Mac, the civetweb stand-alone executable may be started
from the command line.
Running `civetweb` in a terminal, optionally followed by configuration parameters
(`civetweb [OPTIONS]`) or a configuration file name (`civetweb [config_file_name]`),
starts the web server.
For UNIX and Mac, civetweb does not detach from the terminal.
Pressing `Ctrl-C` keys will stop the server.
On Windows, civetweb iconifies itself to the system tray icon when started.
Right-click on the icon pops up a menu, where it is possible to stop
civetweb, or configure it, or install it as Windows service. The easiest way
to share a folder on Windows is to copy `civetweb.exe` to a folder,
double-click the exe, and launch a browser at
civetweb, or configure it, or install it as Windows service.
When started without options, the server exposes the local directory at
[http](http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol) port 8080.
Thus, the easiest way to share a folder on Windows is to copy `civetweb.exe`
to this folder, double-click the exe, and launch a browser at
[http://localhost:8080](http://localhost:8080). Note that 'localhost' should
be changed to a machine's name if a folder is accessed from other computer.
On UNIX and Mac, civetweb is a command line utility. Running `civetweb` in
terminal, optionally followed by configuration parameters
(`civetweb [OPTIONS]`) or configuration file name
(`civetweb [config_file_name]`) starts the
web server. Civetweb does not detach from terminal. Pressing `Ctrl-C` keys
would stop the server.
When started, civetweb first searches for the configuration file.
If configuration file is specified explicitly in the command line, i.e.
`civetweb path_to_config_file`, then specified configuration file is used.
Otherwise, civetweb would search for file `civetweb.conf` in the same directory
where binary is located, and use it. Configuration file can be absent.
the executable is located, and use it. This configuration file is optional.
Configuration file is a sequence of lines, each line containing
command line argument name and it's value. Empty lines, and lines beginning
with `#`, are ignored. Here is the example of `civetweb.conf` file:
The configuration file is a sequence of lines, each line containing one
command line argument name and the corresponding value.
Empty lines, and lines beginning with `#`, are ignored.
Here is the example of `civetweb.conf` file:
document_root c:\www
listening_ports 8080,8043s
listening_ports 80,443s
ssl_certificate c:\civetweb\ssl_cert.pem
When configuration file is processed, civetweb process command line arguments,
if they are specified. Command line arguments therefore can override
configuration file settings. Command line arguments must start with `-`.
For example, if `civetweb.conf` has line
`document_root /var/www`, and civetweb has been started as
`civetweb -document_root /etc`, then `/etc` directory will be served as
document root, because command line options take priority over
configuration file. Configuration options section below provide a good
overview of Civetweb features.
When a configuration file is used, additional command line arguments may
override the configuration file settings.
All command line arguments must start with `-`.
For example: The above `civetweb.conf` file is used, and civetweb started as
`civetweb -document_root D:\web`. Then the `D:\web` directory will be served
as document root, because command line options take priority over the
configuration file. The configuration options section below provides a good
overview of the Civetweb features.
Note that configuration options on the command line must start with `-`,
but their names are the same as in the config file. All option names are