Default Protocol and Port Number of a URL

Q

What Happens If Protocol or Port Number Is Missing in a URL?

✍: FYIcenter.com

A

From a syntax point of view, all URL parts are optional. If some parts are not included in a URL, the browser and the hosting computer will provide default values. Here are some rules about the protocol name, host name, and port number:

1. If the protocol name part is missing, but the host name part is given, "http://" will be used as the default value. The following URLs are identical:

  dev.fyicenter.com/faq/xhtml/
  http://dev.fyicenter.com/faq/xhtml/

2. If the port number part is missing, but the host name part is given, the default port number that matches the protocol name will be used. The following URLs are identical:

  dev.fyicenter.com/faq/xhtml/
  dev.fyicenter.com:80/faq/xhtml/
  http://dev.fyicenter.com/faq/xhtml/
  http://dev.fyicenter.com:80/faq/xhtml/

3. If the port number part is given, the host name part must be specified. The following URLs are invalid:

  http://:8080/
  :80

Â

â‡’HTML Hyper Links and URLs

â‡’â‡’HTML Tutorials

2017-07-07, 1074👍, 0💬

HTML Anchor 'a' Tag/Element
What Is an Anchor "a" Tag/Element? An "a" element is an inline element that you can use to specify a hyper link in your HTML document. An "a" element can also be used to define a bookmark in your HTML document. Here are basic rules about "a" elements: "a" elements are inline elements. "a" elements c... 2017-07-15, 1204👍, 0💬

Default File Name of a URL
What Happens If File Name is Missing in a URL? If the file name part is missing in a URL, the one of the following two rules will be used. 1. If a URL has no file name, but a path name is given, the browser will let the hosting computer to supply the default file name. On most hosting computers, the... 2017-07-07, 1203👍, 0💬

What Is a URL
What Is a URL? A URL (Uniform Resource Locator) is a reference name representing a location of a Web document or other resource that is available on the Internet. Here are some examples of URLs: "http://www.w3.org/" "http://dev.fyicenter.com/faq/ xhtml/""http://www.google.com/search? hl=en&q=... 2017-07-15, 1202👍, 0💬

Relative Path Name of a URL
What Is a Relative Path Name? A relative path name is a path name that starts without the leading slash "/". If a relative path name is used in a URL, the relative path name will be replaced with the current document path name appended with the specified relative path name. If "." or ".." is used in... 2017-07-07, 1182👍, 0💬

Structure of a URL
What Is the Structure of a URL? The structure of a URL is defined by the URL specification, see http://www.ietf.org/rfc/rfc239 6.txt.Generally, a URL consists of 7 parts: Protocol Name - Identifies the communication protocol through which this resource is made available, like "http://" or "ftp://". ... 2017-07-07, 1172👍, 0💬

Defining an HTML Hyper Link
How To Define a Hyper Link? If you want to define a hyper link in your HTML document, you need to use an "a" element with the "href" attribute. Here are basic rules about defining a hyper link with "a" element: An "a" element with the "href" attribute defines a hyper link. The "href" attribute is us... 2017-07-15, 1156👍, 0💬

URL Starts with Path or File name
What Happens If a URL Starts with Path or File name? If a URL starts with a path name, the browser will borrow the protocol name, the host name, and the port number from the URL of the current document to make up the missing parts. For example, if the following URL is used in this document you are v... 2017-07-07, 1088👍, 0💬

Default Protocol and Port Number of a URL
What Happens If Protocol or Port Number Is Missing in a URL? From a syntax point of view, all URL parts are optional. If some parts are not included in a URL, the browser and the hosting computer will provide default values. Here are some rules about the protocol name, host name, and port number: 1.... 2017-07-07, 1075👍, 0💬

Hyper Link Indexes within the HTML Document
How To Build Hyper Link Indexes within the Same Document? If you want build some hyper link indexes within the same document, you need use "a" elements to define some bookmarks, then use "a" elements to define hyper links that pointing to those bookmarks. The tutorial example below shows you how to ... 2017-07-03, 1054👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.