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As we know we will use http protocol to browser comunication between Client and server and normally using port 80.  I want to know where the protocol program is located on
the Linux server ? and what program language is using to write the protocol, Is C or PHP ?
Recently I study and run php program  for socket communication
from the link at php.net ,http://php.net/manual/en/sockets.examples.php at using
port 10000 for my Linux server, it is successfully. Now I would like
to write PHP script to simulate http protocol program but want to use port 10000 instead of 80.

where the http protocol program is located on
the Linux server ? and what program language is using to write the protocol, Is C or
PHP ? So ,I can base on the program reference to start

Please advise
Duncan

Yes, the base for every implementation for the RFC (ie, http, telnet, smtp) would be the socket programming. No matter which programming language you will use.

duncanb7,

If you want to program for a particular protocol (ie. http), you will need to refer the RFC for the same. RFC is nothing but a specification that will explain what should be the input and what should be the output. Now, how to process input and generate output, it's up to the programmer who is implementing that RFC.

refer the below link for the RFC for http protocol.

http://www.w3.org/Protocols/rfc2616/rfc2616.html

Port is the different thing, the standard has defined port numbers for specific protocol (ie. 80 for http, 25 for smtp, 23 for telnet etc), but it's up to the programmer that will decide on which port your program will work. programmer can make it configurable. Examples are apache, tomcat (programmer for apache and tomcat made the port configurable so that user can configure it as per the requirement).

Just know the concept of communcation of http  protocol.
Probaby we can write simple php script to socket  for http protocol
and client send header request and server receive request and
send out response with the html/js file for client's expectation
Finall, just confirm what ever lanuguage, server is using
socket to bind, connect to make http protocal comunication with Client, Right,

If yes, probably, that clarify my understanding  to socket communcation with http

Just know the concept of communcation of http  protocol.
Probaby we can write simple php script to socket  for http protocol
and client send header request and server receive request and
send out response with the html/js file for client's expectation
Finall, just confirm what ever lanuguage, server is using
socket to bind, connect to make http protocal comunication with Client, Right,

If yes, probably, that clarify my understanding  to socket communcation with http

That would vary. The program is usually Apache. On my system, it's to be found at /usr/sbin/apache2

Agree wirh Slimshaneey.

Any application can use any port and if the application is using the port number less than 1024 then it must be run by admin user. The application uses port number greater than 1024 does have such constraint.

You can configure any language to use whatever port you want. If you want PHP to run on port 10000, thats fine, edit PHP.ini and your webserver config file (httpd.conf or apache.conf or whatever server you choose), there is a setting specifically for that.

For sockets, setting ports to use is simply part of the parameters when opening the socket. Be careful not to use a socket already is use by another process though!