HTTP Connection in Iphone - iphone

Question

Since I'm new in iphone I need help in learning about http Connections in Iphone.
Please guide me to some tutorials so that I could learn some http connections tricks in iphone and could communicate with websites.
Also please guide me through some Sample code for the following problem:
I want to send some "Hello world" text to the site and got a reply back from the Web the same word with adiition of s i.e. "Hello Worlds".. please brothers guide me through any sample code.. it's a part of my application that I'm developing in iphone.

Answer 1

You may check this. ASIHTTPRequest package is a highly recommended tool for handling traffic on a iPhone app.
http://allseeing-i.com/ASIHTTPRequest/How-to-use

Answer 2

The best resource is the URL Loading System Programming Guide from Apple. Using NSURLConnection section contains a number of sample codes.

Answer 3

i too new ,but i have sent some msg(soap xml) via http request .my sample code is...
// get host address
NSURL *url = [NSURL URLWithString:#"http://xyz.com"];
NSMutableURLRequest *theRequest =[NSMutableURLRequest requestWithURL:url];
// find msg length, here x is my msg
NSString *msgLength = [NSString stringWithFormat:#"%d", [x length]];
// specify type of msg which u have to send to the host(mine is xml)
[theRequest addValue: #"text/xml; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
// name space which optional one
[theRequest addValue: #"http://mpack.h.org" forHTTPHeaderField:#"SOAPAction"];
[theRequest addValue: msgLength forHTTPHeaderField:#"Content-Length"];
//type of http method
[theRequest setHTTPMethod:#"POST"];
// msg which is need to send to server
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
// establish connection to host
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if( theConnection )
{
webData = [[NSMutableData data] retain];
NSLog(#"Connecting....");
}
else
{
NSLog(#"theConnection is NULL");
}
}
// delegate method for 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 with theConenction %#",error);
[connection release];
[webData release];
}
// u ll get response here
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"DONE. Received Bytes: %d", [webData length]);
}