What is Web Server?

Queston: What is Web Server?
A Web server is a program that uses HTTP to serve the data in form Web pages to users.
When client (like browser OR App), hit an http URL (like http://www.web-technology-experts-notes.in/2016/08/what-is-rtmp-rtmpt-rtmpe-rtmpte-and-rtmps-protocol.html), An request goes to Web Server (domain's server), Web server execute the request and return the data.
Note: Dedicated computers and appliances may be referred to as Web servers as well.


Queston: Giv example of Web Server?
A computer can be converted to web server, for this they need to connect to the internet install the web server software.
Following are web server software.

1. Apache HTTP Server
2. Microsoft Internet Information Services (IIS)
3. Apache Tomcat
4. Nginx
5. Oracle iPlanet Web Server
6. Lighttpd
7. Mobile Web Server
8. Mongoose (web server)
9. Jetty
10. Wamp Server
11. Boa web server
12. CERN httpd
13. Gunicorn
14. Kloxo-MR
15. Roxen
16. AOLserver
17. Tornado (web server)
18. Adobe JRun
19. Hiawatha (web server)
20. enhydra
21. WEBrick

Question: What is the difference between web server and application server?

1. Web Server is a server that serves content to the web using http/https protocol.
   Application server you can write the business login and It can also be work like web server.
   
2. Web Server is used for serve the content whereas application server is used for hosts and exposes business logic and processes.

Question: Why port 80 for web services?
Hypertext Transfer Protocol, port 80 is the port (default port) that the server "listens to" or expects to receive from a Web client.
A port can be specified in the range from 0-65536 on the NCSA server.
However, the server administrator configures the server so that only one port number can be recognized.


Question: What is default port for https?
443


Question: What are the different ports used in Web Development?

1. 20 FTP (File Transfer Protocol)
2. 21 SFTP (Secure File Transfer Protocol)
3. 22 Secure Shell (SSH) Connection
4. 23 Shell connection like ssh but its not reliable.
5. 25 Simple Mail Transfer Protocol (SMTP)
6. 50 Hypertext Transfer Protocol (HTTP)
7. 110 Post Office Protocol (POP)
8. 143 Internet Message Access Protocol (IMAP)
9. 443 Hypertext Transfer Protocol over SSL/TLS (HTTPS)
10. 989 FTP over TLS/SSL

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