Question

The is my code

theDownloadConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

and it is calling these NSURLConnection delegate methods

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;

- (void)connectionDidFinishLoading:(NSURLConnection *)connection;

But it is not calling

- (void)connection:(NSURLConnection *)connection   didSendBodyData:(NSInteger)bytesWritten
                                                 totalBytesWritten:(NSInteger)totalBytesWritten
                                         totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite;

This method of NSURLConnection delegate calls when I do this

[NSURLConnection connectionWithRequest:request delegate:self];

I dont understand why this is happening?

Answer 1

didSendBodyData is only called when the request has a body containing message data like in POST request. You are most likely executing a GET.

From the apple docs:

connection:didSendBodyData:totalBytesWritten:totalBytesExpectedToWrite:
Sent as the body (message data) of a request is transmitted (such as
in an http POST request).