Httpd Example

  
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Example httpd.conf File for setting up THL Locally This is an example of what the httpd.conf file should look like when running an Apache server locally through the WebDeveloper.net package. The following example allows a front-end machine to proxy a virtual host through to a server running on another machine. In the example, a virtual host of the same name is configured on a machine at 192.168.111.2. Httpd is the Apache HyperText Transfer Protocol (HTTP) server program. It is designed to be run as a standalone daemon process. When used like this it will create a pool of child processes or threads to handle requests. A web server is a network service that serves content to a client over the web. This typically means web pages, but any other documents can be served as well. Web servers are also known as HTTP servers, as they use the hypertext transport protocol (HTTP). The Apache HTTP Server, httpd, is an open source web server developed by the Apache Software Foundation.

There is no package called httpd! httpd is part of busybox functionality. You could either compile busybox with this functionality included, or you could install a second busybox binary with this functionality included.

From https://busybox.net/downloads/BusyBox.html#httpd:

Note that multiple instances of httpd can be run, which would have different .conf files:

Configuration

httpd works without a configuration file. Default is /etc/httpd.conf (there is also some brief uci support for this: httpd):

CGI scripts

See Common Gateway Interface. httpd expects it's CGI script files to be in the subdirectory cgi-bin under main web directory set by options -h (default is /www, so /www/cgi-bin). The CGI script files must also have permission to be executed (min mode 700).

CGI

Standard set of Comon Gateway Interface environment variable are :

/cgi-bin/test

Environment variables are set up and the script is invoked with pipes for stdin/stdout.

HTML Forms

If a post is being done the script is fed the POST data in addition to setting the QUERY_STRING variable (for GETs or POSTs).

The preferred way to do forms in CGI is POST.

Linux - Failed To Start Httpd Server: Address Already In ..

POST

Example how to use POST in form:

/www/form-post.html

/www/cgi-bin/test-post:

GET

Text area fields (and any other field that may contain n are very hard to menage). Example how to use GET in form:

/www/form-get.html:

/www/cgi-bin/test-get:

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Apache Server Configuration File

Apache has a great number of directives which you can set and manipulate in order to set your server’s behavior.

Every server administrator will often update some of the directives, it all depends on their particular needs. Every person working with the Apache server is likely to encounter these directives.

Apache HTTP Server is configured by placing directives in plain text configuration files, the main configuration file is usually called httpd.conf. The Apache HTTP Server configuration file is /etc/httpd/conf/httpd.conf. The httpd.conf file is well-commented and mostly self-explanatory.

Changes to the main configuration files are only taken by Apache only if started/restarted.It stores information on various functions of the server, which can be edited by removing or adding a number sign “#” at the beginning of the line, thus setting values for each directive.

Apache configuration files contain one directive per line. The backslash “” may be used as the last character on a line to indicate that the directive continues onto the next line. There must be no other characters or white space between the backslash and the end of the line.

Directives in the configuration files are case-insensitive, but arguments of directives are case sensitive. Lines that begin with the hash character “#” are considered comments, and are ignored.

Basic Paths of httpd.conf file in Unix/Linux system.

/var/www/conf/httpd.conf
/usr/local/apache/conf/httpd.conf
/etc/httpd/conf/httpd.conf

httpd.conf on windows

D:xamppapacheconfhttpd.conf

Let’s discuss some most basic directives of Apache Server:

ServerName

The ServerName directive is used to set the host name of the server, this is how the server identifies itself. It uses this name when responding to HTTP requests.

You can set this directive either in the server’s configuration or virtual hosts. The location of your configuration files depend on both the Apache version and Linux distribution.

If the ServerName directive is not specified, the server tries to obtain it by performing a reverse DNS look-up on its IP address. You should always set a ServerName for the server explicitly; it is the only value you need to set to get your server running after installation.

You will have to use the IP address of your machine if you don’t yet have a registered domain name. Otherwise, you would need to add the domain name and IP address to the server’s hosts file- the same as you do with your PC’s hosts file. By doing this, the server checks its hosts file before consulting with the DNS server.

Assuming our domain name is www.examplesite.com and our server’s IP address is 117.220.48.20, you need to add the following line to the server’s hosts file (/etc/hosts):

After editing the hosts file, you need to restart (or stop and start) Apache.

Listen

The Listen directive tells Apache what IP addresses and/or ports it should listen to for incoming requests. If nothing is specified, Apache listens to all addresses and ports on the machine. The default configuration sets the server to listen to port 80, the default port for HTTP communication.

If you only specify an IP address, the server will respond to requests coming to all ports of that address (also called an interface). If only a port number is specified, then Apache responds to requests on the specified port arriving at all interfaces on the machine. If an address and port combination is supplied, then Apache only responds to those specific interface/port combinations.

If your server installation has separate configuration files, you should be able to find or set this directive in the ports.conf file.

You can find this file in the same location as your Apache configuration files (mine is /etc/apache2/ports.conf, but that might be different for other Apache versions and/or Linux distributions).

Let’s assume our example site is at IP address 117.220.48.20. To set Apache to listen to ports 80 and 443, the respective default ports for HTTP and HTTPS, you need to enter the following directives in your ports.conf file:

Alternatively, if you want Apache to listen to ports 80 and 443 on all interfaces regardless of the IP address, you can enter the following:

Web User and Group

On Unix operating systems, it’s a good idea to configure Apache to run under a specific user and group instead of root. Doing so makes the server more secure and less vulnerable to attacks. Ideally, the user and group you set should not be able to login to the server (ie: have no login credentials) and no login shell; they will just be used for handling web client requests. Set the Apache user’s home directory to the web server’s document directory, usually located at /var/www or /usr/local/apache2/htdocs.

The example above uses anyUserName as our web user and group; just use a name not reserved for other processes. -d /var/www sets the home directory of the new account to /var/www, and -s /bin/false ensures the new account has no shell access. Next, you need to modify your config file to use the new Apache user and group. If yours says:

Then you need to find where these variables are defined and change their values. Usually, the above directive is preceded by a comment letting you know exactly where to set the new values. Ford fiesta 2011 transmission issues. Otherwise, you will just insert the new user and group name in place of the old. So your final config lines could look like this:

ServerRoot

Apache’s important files, like the server’s configuration, error, and log files are kept at the top of the directory tree. This location is the ServerRoot, and you can set a different value in Apache’s main config file. Depending on your installation, the default can be something like /usr/local/apache2 or /etc/apache2. Any Apache directives using a relative path will, by default, append to the root path specified in ServerRoot.

When you first install your server, the configuration and log files are placed in the ServerRoot. You can change its value to a new directory, but make sure to copy the configuration files to the new location. Also, make sure you do not to add a trailing slash to the path when you modify the value.

ErrorLog

When an error occurs, Apache logs the error to a log file. The location of the error log is determined by the value specified using the ErrorLog directive. This file is critical because you will refer to it in order to debug errors, solve server configuration problems, and optimize the server.

If the server hosts multiple sites and you want to have separate error logs for each site, you can specify a different file and location for each site in the virtual hosts file.

If you don’t, then all sites’ errors are logged in the default error log, typically located at /usr/local/apache2/logs/error_log or /var/log/apache2/error.log (once again, depending on your installation).

Please note that the above log paths are absolute.

This is a relative path. Therefore, the actual error log location is $ServerRoot/logs/error_log.

The LogLevel directive controls the level of the messages logged in the error logs. By default, it is set to warn, meaning that all messages with the value of warning and higher (as in more critical) will be logged. You can change the value of this directive to adjust the logging level to your preference.

DocumentRoot

The DocumentRoot directive sets the location of the server’s public files, like htdocs. This is the default Apache web server document directory, and its contents are readily and publicly available to clients connecting through the web. It contains the static and dynamic content to be served once the server receives an HTTP request for them. Since files and sub-directories under htdocs are available for the public, it is very important to handle permissions correctly in order to minimize the ability to compromise the server’s safety and security.

Depending on your installation, the default DocumentRoot location could be something like /var/www or /usr/local/apache2/htdocs.

If you are hosting multiple websites on the same server, you need to set a different DocumentRoot for each site. This can be done within the respective VirtualHost directive that corresponds to each site. Let’s say you have three websites on the same server (eg: www.examplesite1.com, www.examplesite2.com, www.examplesite3.com), your virtual hosts file might look something like the following:

To set a separate error log for each of these domains, which is really a good idea, then your virtual hosts will like this:

PidFile

The ServerName directive is used to set the host name of the server; this is how the server identifies itself.

The Apache service first starts as root in order to bind to the privileged port 80 for HTTP (or 443 if using SSL) because port numbers less than 1024 are only reserved to the root user. After the initial execution, children processes spawn to handle client requests which are owned by the Apache user specified in the configuration file. For this reason, you will find one root process and multiple processes belonging to the web user; this root process is the first one initiated when Apache starts. It has a process ID, and this ID is stored in the Pid file on the server. You can control the location of the Pid file by using the PidFile directive in the configuration file.

If you open the file specified in the PidFile directive, you will find a number that corresponds to the parent process ID. You can stop the Apache server by killing the process using its ID number. However, kill the process only as a last resort.

File Inclusion

It is possible to separate server configuration and settings into multiple files; in fact, some Apache installations actually do so. These multiple files can then be included in the original server config file. This approach is ideal in order to keep your config file light and clear, but it also forces you to look inside multiple files residing in different locations to completely understand how Apache is configured. In any case, below is the syntax for including external config files. Whether or not you want to use file inclusion is up to you:

As you can see from the examples above, you can include a specific file by name, a directory (and thus all files therein), or multiple files by using wildcards.

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Start, Stop, and Restart Apache

Every time you edit one of Apache’s configuration files, you need to restart (or stop and start) the service so that Apache can load the new configuration.
Otherwise, your changes will just remain on file for the next restart or server start. If your changes cause syntax errors in the configuration files, restarting will show you error messages concerning those mistakes. Additionally, the

Apache web server will not start until you fix those errors.

To stop the Apache server, type in the following command in the console:

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To start the Apache server, type in the following command:

To restart the Apache server, type in the following command:

Apache HTTPD Is An HTTPserverdaemon Produced By The Apache Foundation. It Is A Piece Of Software That Listens For Network Requests (which Are Expre..

Naturally, you must be logged in with a privileged user in order to execute these commands. You could, however, still run the above commands by adding sudo before each line. This basically tells the system that you are executing the command as a super user (hence the naming, sudo), in which case the system asks you to enter a password before it executes your command. If you don’t know that password, ask your server admin. Preceding the above commands with sudo:

If you have XAMPP, then you will get a User Interface to updating these directive as well as the start and stop the Apache service on a single click.

In the day to day of PHP programming I am sure you usually need to update these Apache directive, in the same way These above information will be helpful to you.

Let me know, if you need any help related to above, I’ll be glad to help you always.

Post you comment with your suggestion or queries. Thanks!