Chapter 6: Web and RPC Based P. Application Development Chapter goal Www and Http Www and hTMl Web Programming RPC and Middleware World wide web Use of Client-Server Paradigm Major application used on the Web server Internet Makes set of pages available Simple interface Uses port 80 Two concepts Web client Called a browser Creates tcp connection Sends requests for items Use of Client-Server Paradigm Use of client-Server Paradigm Primary protocol used between Response from server begins with ASCII browser and server known as Hyper Text Transfer Protocol (HPPT) Status code(200: handled request Http requests sent as text(ascir) HIYPPAA-G 280 oR Date: Mor, 3U Det 2000 01:22:22 GT GET: request an item from the server ad:St,a8cet208001:03:3 HEAD: request status information about Eag:"3e31-3883p9 an item ccept-Rangea: bytes POST: send data to the server Connection: cLose Content-Type: text/plain1 哈工大计算机学院 李全龙 Network Application Development Server Software Design 1 Chapter 6: Web and RPC Based Application Development Chapter goal: „ WWW and HTTP „ Web Programming „ RPC and Middleware 哈工大计算机学院 李全龙 Network Application Development Server Software Design 2 WWW and HTTP 哈工大计算机学院 李全龙 Network Application Development Server Software Design 3 World Wide Web „ Major application used on the Internet „ Simple interface „ Two concepts „ Point „ Click 哈工大计算机学院 李全龙 Network Application Development Server Software Design 4 Use of Client-Server Paradigm „ Web server „ Makes set of pages available „ Uses port 80 „ Web client „ Called a browser „ Creates TCP connections to server „ Sends requests for items 哈工大计算机学院 李全龙 Network Application Development Server Software Design 5 Use of Client-Server Paradigm „ Primary protocol used between browser and server known as HyperText Transfer Protocol (HPPT) „ HTTP requests sent as text (ASCII) „ GET: request an item from the server „ HEAD: request status information about an item „ POST: send data to the server 哈工大计算机学院 李全龙 Network Application Development Server Software Design 6 Use of Client-Server Paradigm „ Response from server begins with ASCII header „ Status code (200 = handled request)