User talk:Quantum745

Welcome!

Hello, Quantum745, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Unfortunately, one or more of the pages you created, such as What is a domain name?, may not conform to some of Wikipedia's guidelines, and may soon be deleted.

There's a page about creating articles you may want to read called Your first article. If you are stuck, and looking for help, please come to the New contributors' help page, where experienced Wikipedians can answer any queries you have! Or, you can just type {{helpme}} on this page, followed by your question, and someone will show up shortly to answer your questions. Here are a few other good links for newcomers:

I hope you enjoy editing here and being a Wikipedian! Please sign your name on talk pages using four tildes (~~~~); this will automatically produce your name and the date. If you have any questions, check out Wikipedia:Questions or ask me on my talk page. Again, welcome! GILO A&E⇑ 11:06, 17 June 2012 (UTC)[reply]

Your contributed article, What is a domain name?[edit]

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Hello, I noticed that you recently created a new page, What is a domain name?. First, thank you for your contribution; Wikipedia relies solely on the efforts of volunteers such as you. Unfortunately, the page you created covers a topic on which we already have a page - Domain name. Because of the duplication, your article has been tagged for speedy deletion. Please note that this is not a comment on you personally and we hope you will continue helping to improve Wikipedia. If the topic of the article you created is one that interests you, then perhaps you would like to help out at Domain name - you might like to discuss new information at the article's talk page.

If you think that the article you created should remain separate, contest the nomination by clicking on the button labelled "Click here to contest this speedy deletion" in the speedy deletion tag. Doing so will take you to the talk page where you can explain why you believe the page should not be deleted. You can also visit the page's talk page directly to give your reasons, but be aware that once a page is tagged for speedy deletion, it may be removed without delay. Please do not remove the speedy deletion tag yourself, but do not hesitate to add information that is consistent with Wikipedia's policies and guidelines. If the page is deleted, you can contact one of these administrators to request that the administrator userfy the page or email a copy to you. Additionally if you would like to have someone review articles you create before they go live so they are not nominated for deletion shortly after you post them, allow me to suggest the article creation process and using our search feature to find related information we already have in the encyclopedia. Try not to be discouraged. Wikipedia looks forward to your future contributions. GILO A&E⇑ 11:06, 17 June 2012 (UTC)[reply]

URL Encoding (or: 'What are those "%20" codes in URLs?')[edit]

Uniform Resource Locators (URL) specification

URL - Uniform Resource Locator Web browsers request pages from web servers by using a URL. The URL is the address of a web page, like: http://www.mydreamstores.com

URL Encoding URLs can only be sent over the Internet using the ASCII character-set. Since URLs often contain characters outside the ASCII set, the URL has to be converted into a valid ASCII format. URL encoding replaces unsafe ASCII characters with a "%" followed by two hexadecimal digits. URLs cannot contain spaces. URL encoding normally replaces a space with a + sign.

The specification for URLs (RFC 1738, Dec. '94) poses a problem, in that it limits the use of allowed characters in URLs to only a limited subset of the US-ASCII character set: "...Only alphanumerics [0-9a-zA-Z], the special characters "$-_.+!*'()," [not including the quotes - ed], and reserved characters used for their reserved purposes may be used unencoded within a URL." HTML, on the other hand, allows the entire range of the ISO-8859-1 (ISO-Latin) character set to be used in documents - and HTML4 expands the allowable range to include all of the Unicode character set as well. In the case of non-ISO-8859-1 characters (characters above FF hex/255 decimal in the Unicode set), they just can not be used in URLs, because there is no safe way to specify character set information in the URL content yet [RFC2396.]

URLs should be encoded everywhere in an HTML document that a URL is referenced to import an object (A, APPLET, AREA, BASE, BGSOUND, BODY, EMBED, FORM, FRAME, IFRAME, ILAYER, IMG, ISINDEX, INPUT, LAYER, LINK, OBJECT, SCRIPT, SOUND, TABLE, TD, TH, and TR elements.)

What characters need to be encoded and why? ASCII Control characters

   	Why:	These characters are not printable.

Characters: Includes the ISO-8859-1 (ISO-Latin) character ranges 00-1F hex (0-31 decimal) and 7F (127 decimal.) Non-ASCII characters

   	Why:	These are by definition not legal in URLs since they are not in the ASCII set.

Characters: Includes the entire "top half" of the ISO-Latin set 80-FF hex (128-255 decimal.) "Reserved characters"

   	Why:	URLs use some characters for special use in defining their syntax. When these characters are not used in their special role inside a URL, they need to be encoded.

Characters: Character Code Points (Hex) Code Points (Dec)

Dollar ("$")
Ampersand ("&")
Plus ("+")
Comma (",")
Forward slash/Virgule ("/")
Colon (":")
Semi-colon (";")
Equals ("=")
Question mark ("?")
'At' symbol ("@")

24 26 2B 2C 2F 3A 3B 3D 3F 40 36 38 43 44 47 58 59 61 63 64 "Unsafe characters"

   	Why:	Some characters present the possibility of being misunderstood within URLs for various reasons. These characters should also always be encoded.

Characters: Character Code Points (Hex) Code Points (Dec) Why encode? Space 20 32 Significant sequences of spaces may be lost in some uses (especially multiple spaces) Quotation marks 'Less Than' symbol ("<") 'Greater Than' symbol (">") 22 3C 3E 34 60 62 These characters are often used to delimit URLs in plain text. 'Pound' character ("#") 23 35 This is used in URLs to indicate where a fragment identifier (bookmarks/anchors in HTML) begins. Percent character ("%") 25 37 This is used to URL encode/escape other characters, so it should itself also be encoded. Misc. characters:

  Left Curly Brace ("{")
  Right Curly Brace ("}")
  Vertical Bar/Pipe ("|")
  Backslash ("\")
  Caret ("^")
  Tilde ("~")
  Left Square Bracket ("[")
  Right Square Bracket ("]")
  Grave Accent ("`")

7B 7D 7C 5C 5E 7E 5B 5D 60 123 125 124 92 94 126 91 93 96 Some systems can possibly modify these characters.

How are characters URL encoded? URL encoding of a character consists of a "%" symbol, followed by the two-digit hexadecimal representation (case-insensitive) of the ISO-Latin code point for the character. Example Space = decimal code point 32 in the ISO-Latin set. 32 decimal = 20 in hexadecimal The URL encoded representation will be "%20"

URL encoding converter The box below allows you to convert content between its unencoded and encoded forms. The initial input state is considered to be "unencoded" (hit 'Convert' at the beginning to start in the encoded state.) Further, to allow actual URLs to be encoded, this little converter does not encode URL syntax characters (the ";", "/", "?", ":", "@", "=", "#" and "&" characters)...if you also need to encode these characters for any reason, see the "Reserved characters" table above for the appropriate encoded values.