HTTP Status Codes for Java Web Applications

Error Code	Message	Details
100	Continue	Only a part of the request has been received by the server, but as long as it has not been rejected, the client should continue with the request
101	Switching Protocols	The server switches protocol.
200	OK	The request is OK
201	Created	The request is complete, and a new resource is created
202	Accepted	The request is accepted for processing, but the processing is not complete.
203	Non-authoritative Information
204	No Content
205	Reset Content
206	Partial Content
300	Multiple Choices	A link list. The user can select a link and go to that location. Maximum five addresses
301	Moved Permanently	The requested page has moved to a new url
302	Found	The requested page has moved temporarily to a new url
303	See Other	The requested page can be found under a different url
304	Not Modified
305	Use Proxy
306	Unused	This code was used in a previous version. It is no longer used, but the code is reserved.
307	Temporary Redirect	The requested page has moved temporarily to a new url.
400	Bad Request	The server did not understand the request
401	Unauthorized	The requested page needs a username and a password
402	Payment Required	You can not use this code yet
403	Forbidden	Access is forbidden to the requested page
404	Not Found	The server can not find the requested page.
405	Method Not Allowed	The method specified in the request is not allowed.
406	Not Acceptable	The server can only generate a response that is not accepted by the client.
407	Proxy Authentication Required	You must authenticate with a proxy server before this request can be served.
408	Request Timeout	The request took longer than the server was prepared to wait.
409	Conflict	The request could not be completed because of a conflict.
410	Gone	The requested page is no longer available.
411	Length Required	The "Content-Length" is not defined. The server will not accept the request without it.
412	Precondition Failed	The precondition given in the request evaluated to false by the server.
413	Request Entity Too Large	The server will not accept the request, because the request entity is too large.
414	Request-url Too Long	The server will not accept the request, because the url is too long. Occurs when you convert a "post" request to a "get" request with a long query information.
415	Unsupported Media Type	The server will not accept the request, because the media type is not supported.
417	Expectation Failed
500	Internal Server Error	The request was not completed. The server met an unexpected condition
501	Not Implemented	The request was not completed. The server did not support the functionality required.
502	Bad Gateway	The request was not completed. The server received an invalid response from the upstream server
503	Service Unavailable	The request was not completed. The server is temporarily overloading or down.
504	Gateway Timeout	The gateway has timed out.
505	HTTP Version Not Supported	The server does not support the "http protocol" version.

Top 20 Most Popular Programming Languages

Top 20 Most Popular Programming Languages

1.Python 
2.Ruby 
3.JavaScript 
4.C 
5.C# 
6.PHP 
7.Java 
8.C++ 
9.Haskell 
10.Clojure
11.CoffeeScript
12.Objective C
13.Lisp
14.Perl
15.Scala
16.Scheme
17.Other
18.Erlang
19.Lua
20.SQL

Famous Sites Developed Languages

Languages Used In
1. Google – Java (Web), – C++ (indexing)
2. Facebook – PHP
3. YouTube- Flash, Python, Java
4. Yahoo– PHP and Java
5. Microsoft Live.com– .NET
6. Baidu – Unknown
7. Wikipedia – PHP
8. Blogger – Java
9. MSN – .NET
10.Twitter – Ruby on Rails, Scala, Java .

Memory Size

Memory Size

1 Bit = Binary Digit
8 Bits = 1 Byte
1024 Bytes = 1 Kilobyte
1024 Kilobytes = 1 Megabyte
1024 Megabytes = 1 Gigabyte
1024 Gigabytes = 1 Terabyte
1024 Terabytes = 1 Petabyte
1024 Petabytes = 1 Exabyte
1024 Exabytes = 1 Zettabyte
1024 Zettabytes = 1 Yottabyte
1024Yottabytes = 1 Brontobyte
1024 Brontobytes = 1 Geopbyte
1024 Geopbyte=1 Saganbyte
1024 Saganbyte=1 Pijabyte
Alphabyte = 1024 Pijabyte
Kryatbyte = 1024 Alphabyte
Amosbyte = 1024 Kryatbyte
Pectrolbyte = 1024 Amosbyte
Bolgerbyte = 1024 Pectrolbyte
Sambobyte = 1024 Bolgerbyte
Quesabyte = 1024 Sambobyte
Kinsabyte = 1024 Quesabyte
Rutherbyte = 1024 Kinsabyte
Dubnibyte = 1024 Rutherbyte
Seaborgbyte = 1024 Dubnibyte
Bohrbyte = 1024 Seaborgbyte
Hassiubyte = 1024 Bohrbyte
Meitnerbyte = 1024 Hassiubyte
Darmstadbyte = 1024 Meitnerbyte
Roentbyte = 1024 Darmstadbyte
Coperbyte = 1024 Roentbyte

Well Known Port Numbers

Well Known Port Numbers

80 - Hypertext Transfer Protocol (HTTP)
21 - File Transfer Protocol (FTP)
23 - Telnet protocol - unencrypted text communications
25 - Simple Main Transfer Protocol (SMTP)
109 - Post Office Protocol v2 (POP2)
110 - Post Office Protocol v3 (POP3)
115 - Simple File Transfer Protocol (SFTP)
143 - Internet Message Access Protocol (IMAP)
443 - Hypertext Transfer Protocol over SSL/TLS (HTTPS)
992 - TELNET protocol over TLS/SSL
993 - Internet Message Access Protocol over SSL (IMAPS)
995 - Post Office Protocol 3 over TLS/SSL (POP3S)
1433 - MSSQL Server
1801 - Microsoft Message Queuing.