What is the difference between HTTP and a URL as used for a website? How is that related to the layers of HTTP?
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closed as too broad by John Conde♦ Mar 24 '15 at 11:44
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They're completely dufferent things. Used for dufferent purposes. HTTP is a transfer protocol, URL is a resource locator. – TZHX Mar 24 '15 at 9:34
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A URL is an address used to locate documents. Examples of URLs are:
http://example.com/mypage.htmlftp://example.com/download.zipmailto:user@example.comfile:///home/user/file.txttel:1-888-555-5555http://example.com/resource?foo=bar#fragment
HTTP is the protocol used to fetch some URLs (the ones that start with http://) from servers. A simple HTTP request works like this:
- Parse the server name out of the URL (
example.com) - Look up the IP address for that server (
93.184.216.34) Open a socket to that server and write an HTTP request (ending with two new lines):
GET /resource?foo=bar HTTP/1.1 Host: example.comWait for the response from the server:
HTTP/1.1 200 OK Accept-Ranges: bytes Cache-Control: max-age=604800 Content-Type: text/html Date: Tue, 24 Mar 2015 11:00:51 GMT Etag: "359670651" Expires: Tue, 31 Mar 2015 11:00:51 GMT Last-Modified: Fri, 09 Aug 2013 23:54:35 GMT Server: ECS (ewr/15BD) X-Cache: HIT x-ec-custom-error: 1 Content-Length: 1270 <!doctype html> <html> <head> ...
As you can see, a URL is an address and HTTP is a method of talking to a server.
I'm not sure what the HTTP layers you are referring to are.
answered Mar 24 '15 at 11:02
