HTTP Connection in Iphone -

since i'm new in iphone need in learning http connections in iphone. please guide me tutorials learn http connections tricks in iphone , communicate websites.

also please guide me through sample code following problem: want send "hello world" text site , got reply web same word adiition of s i.e. "hello worlds".. please brothers guide me through sample code.. it's part of application i'm developing in iphone.

i new ,but have sent msg(soap xml) via http request .my sample code is...

  
// host address nsurl *url = [nsurl urlwithstring:@"http://xyz.com"]; nsmutableurlrequest *therequest =[nsmutableurlrequest requestwithurl:url];
  
// find msg length, here x msg  nsstring *msglength = [nsstring stringwithformat:@"%d", [x length]];
  
// specify  type of msg u have send host(mine xml) [therequest addvalue: @"text/xml; charset=utf-8" forhttpheaderfield:@"content-type"]; // name space optional 1 [therequest addvalue: @"http://mpack.h.org" forhttpheaderfield:@"soapaction"];
  
[therequest addvalue: msglength forhttpheaderfield:@"content-length"]; //type of http method [therequest sethttpmethod:@"post"]; // msg need send server [therequest sethttpbody: [soapmessage datausingencoding:nsutf8stringencoding]];
  
// establish connection host  nsurlconnection *theconnection = [[nsurlconnection alloc] initwithrequest:therequest delegate:self];
  
if( theconnection ) {     webdata = [[nsmutabledata data] retain];     nslog(@"connecting....");
  
} else { nslog(@"theconnection null");
  
}
  
}
  
// delegate method nsurlconnection -(void)connection:(nsurlconnection *)connection didreceiveresponse:(nsurlresponse *)response {     [webdata setlength: 0]; } -(void)connection:(nsurlconnection *)connection didreceivedata:(nsdata *)data {     [webdata appenddata:data]; } -(void)connection:(nsurlconnection *)connection didfailwitherror:(nserror *)error {     nslog(@"error theconenction %@",error);     [connection release];     [webdata release];
  
} // u ll response here -(void)connectiondidfinishloading:(nsurlconnection *)connection {     nslog(@"done. received bytes: %d", [webdata length]);
  
}