WEB1P webarch1 Web architecture Dr Jim Briggs. WEB1P webarch2 What is the web? Distributed system Client-server system Characteristics of clients and.

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Presentation transcript:

WEB1P webarch1 Web architecture Dr Jim Briggs

WEB1P webarch2 What is the web? Distributed system Client-server system Characteristics of clients and servers –Servers always on / Clients choose when on –Clients do not need high performance if the work is done on the server Protocol based

WEB1P webarch3 Basic architecture of the web

WEB1P webarch4 Common web tools Browsers –Microsoft Internet Explorer –Mozilla Firefox –Google Chrome –Opera –Safari –Netscape Navigator –Konqueror –Lynx Servers –Apache –Internet Information Server (Microsoft) Application servers

WEB1P webarch5 HTTP protocol Specified by – Based on requests and responses A response can contain any document –MIME ( Multipurpose Internet Mail Extensions ) types – A stateless protocol Normally transported via a TCP/IP connection –Default port is TCP 80

WEB1P webarch6 HTTP requests Requests –GET –POST –PUT –HEAD Example request GET HTTP/1.1

WEB1P webarch7 HTTP responses HTTP/ OK Server: Microsoft-IIS/4.0 Date: Mon, 29 Apr :50:53 GMT Content-Type: text/html Accept-Ranges: bytes Last-Modified: Wed, 10 Apr :12:34 GMT ETag: "085fb85aae0c11:54fb" Content-Length: University of Portsmouth - Our University...

WEB1P webarch8 An error response HTTP/ Object Not Found Server: Microsoft-IIS/4.0 Date: Mon, 29 Apr :58:12 GMT Content-Length: Content-Type: text/html University of Portsmouth - Our University...

WEB1P webarch9 Dynamic web pages Four models: –Server-side includes –CGI –Server modules –Auxiliary servers

WEB1P webarch10 CGI architecture

WEB1P webarch11 CGI specification Specified at

WEB1P webarch12 Server module

WEB1P webarch13 Auxiliary server

WEB1P webarch14 Summary Clients and servers HTTP protocol MIME types Dynamic content CGI Server modules Auxiliary servers