2. Browser sends HTTP request to server GET /comp1274/randyc/lab10done/enter_country.htm HTTP/1.1 Accept: */* Accept-Language: en-us,en-ca;q=0.5 Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727) Host: csweb2.mtroyal.ca Connection: Keep-Alive http://en.wikipedia.org/wiki/HTTP_persistent_connection Sử dụng cùng một TCP connection cho nhiều HTTP request HTTP Request Browser Web Server
3. Server receives and processes the HTTP request HTTP Request Browser Web Server Retrieve Requested file
4. Server sends HTTP response back HTTP/1.1 200 OK Server: Microsoft-IIS/5.0 Server Date: Thu, 30 Mar 2006 19:50:54 GMT Content-Type: text/html HTTP Accept-Ranges: bytes Response Last-Modified: Fri, 24 Mar 2006 17:50:50 GMT Content-Length: 209 Browser <HTML><HEAD><TITLE>Enter A Country</TITLE></HEAD> <BODY> <FORM METHOD=POST ACTION=form_filter.asp> Enter Country Search: <INPUT TYPE=TEXT NAME=Search><P> <INPUT TYPE=SUBMIT> </FORM> </BODY></HTML>
7. Browser sends HTTP request to server POST /comp1274/randyc/lab10done/form_filter.asp HTTP/1.1 Accept: */* Referer: http://csweb2.mtroyal.ca/comp1274/randyc/lab10done/enter_country.htm Accept-Language: en-us,en-ca;q=0.5 Content-Type: application/x-www-form-urlencoded Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727) Host: csweb2.mtroyal.ca Content-Length: 13 Connection: Keep-Alive Cache-Control: no-cache Search=Canada User entered form data goes here in the http request header as a name=value pair
Digression: What if GET rather than POST? <FORM METHOD=GET ACTION=form_filter.asp> Then the user entered form data is added to the requested URL GET /comp1274/randyc/lab10done/form_filter.asp?Search=Canada HTTP/1.1 Versus <FORM METHOD=POST ACTION=form_filter.asp> Then the user entered form data is added to the end of HTTP request header POST /comp1274/randyc/lab10done/form_filter.asp HTTP/1.1 rest of HTTP request header goes here Search=Canada
8. Server receives and processes the HTTP request HTTP Request Browser Web Server Server processes the request
9. Server script generates response sent back to browser HTTP/1.1 200 OK Server: Microsoft-IIS/5.0 Date: Thu, 30 Mar 2006 19:51:06 GMT Content-Length: 164 Content-Type: text/html Cache-control: private <HTML><HEAD><TITLE>Reading Recordsets</TITLE></HEAD> <BODY> <H2>Countries</H2> <TABLE BORDER=1> <TR><TD>2</TD><TD>Canada</TD></TR> </TABLE> </BODY></HTML>
2. Browser sends HTTP request to server GET /comp1274/randyc/lab10done/data_browser.asp HTTP/1.1 Accept: */* Accept-Language: en-us,en-ca;q=0.5 Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727) Host: csweb2.mtroyal.ca Connection: Keep-Alive
3. Server receives and processes the HTTP request HTTP Request Browser Web Server Server processes the request
4. Server script generates response sent back to browser HTTP/1.1 200 OK Server: Microsoft-IIS/5.0 Date: Thu, 30 Mar 2006 19:51:06 GMT Content-Length: 1590 Content-Type: text/html Cache-control: private <HTML><HEAD><TITLE>Data Browser</TITLE></HEAD> <BODY> <HR>SELECT * FROM Movies WHERE RunTime < 90<HR> <TABLE BORDER=1> <TR> <TD><B>Title</B></TD> <TD><B>Release Date</B></TD> <TD><B>Run Time</B></TD> </TR> ...
7. Browser sends HTTP request to server GET /comp1274/randyc/lab10done/movie.asp?ID=84 HTTP/1.1 Accept: */* Referer: http://csweb2.mtroyal.ca/comp1274/randyc/lab10done/data_browser.asp Accept-Language: en-us,en-ca;q=0.5 Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727) Host: csweb2.mtroyal.ca Connection: Keep-Alive
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