java - HTTP Request in GWT -

i have understand whole rpc mechanism because need own project , upcoming exam.

@remoteservicerelativepath("message") public interface messageservice extends remoteservice {    message getmessage(string input); } 

the "remoteservicerelativepath..." part confusing me. don't understand how works http url , how http request works in general. i'm beginner , cool if here explain me :) in advance!

for me confusing part how use @remoteservicerelativepath("message") , have put in web.xml.

  <servlet-mapping>     <servlet-name>greetservlet</servlet-name>     <url-pattern>/sample/greet</url-pattern>   </servlet-mapping> 

so url /sample/greet made of 2 strings in case: sample comes module name, find in *.gwt.xml file.

<module rename-to='sample'>     ... </module> 

and greet part in comes @remoteservicerelativepath("greet")

@remoteservicerelativepath("greet") public interface greetingservice extends remoteservice {     string greetserver(string name) throws illegalargumentexception; } 

this not answering questions maybe helps anyway