1. Server-side http General form of http response/request GET request method POST request method Responses Servlet support

2. Server-side http General form of http response/request GET request method POST request method Responses Servlet support

3. http request/response client –opens connection on a tcp/ip socket –acquires input and output streams is=socket.getInputStream(), os=socket.getOutputStream() –sends request on os awaits response on is

4. http request/response client server –sends a single response with headers describing success or failure status content format … –followed by body

5. Server-side http General form of http response/request GET request method POST request method Responses Servlet support

6. GET Request URL http://www.cs.umb.edu/index.html protocolserver DNS addrresource identifier GET /index.html/ HTTP/1.1 GET / /

7. GET request Resource identifier may include cgi-style arguments http://gazelle.cs.umb.edu/efg/servlet/search?Genus=Pteronymia&Species=fulvimargo &displayFormat=XML It is server's responsibility to parse this and do something meaningful Java servlet interface has support for the parsing

8. Server-side http General form of http response/request GET request method POST request method Responses Servlet support

9. http POST Support for large data to be sent to server No specification for query format Increasingly common to POST XML with query syntax More generally POST XML with message syntax, e.g. SOAP

10. Server-side http General form of http response/request GET request method POST request method Responses Servlet support

11. Server-side http General form of http response/request GET request method POST request method Responses Servlet support