DataRequest, FileRequest: send HeadersReceived notification

The "header" in this case is just the MIME type and content size, but we
must still send the notification when these are available. It will be
used for example in WebKit next release.

src/kits/network/libnetapi/DataRequest.cpp

@@ -86,6 +86,7 @@ BDataRequest::_ProtocolLoop()
 		if (charset.Length() > 0)
 			mimeType << ";" << charset;
 		fResult.SetContentType(mimeType);
+
 	}
 
 	if (isBase64) {
@@ -117,6 +118,7 @@ BDataRequest::_ProtocolLoop()
 	fResult.SetLength(length);
 
 	if (fListener != NULL) {
+		fListener->HeadersReceived(this);
 		fListener->DownloadProgress(this, length, length);
 		if (length > 0)
 			fListener->DataReceived(this, payload, 0, length);

src/kits/network/libnetapi/FileRequest.cpp

@@ -77,6 +77,8 @@ BFileRequest::_ProtocolLoop()
 				return error;
 			fResult.SetLength(size);
 
+			fListener->HeadersReceived(this);
+
 			ssize_t chunkSize;
 			char chunk[4096];
 			while ((chunkSize = file.Read(chunk, sizeof(chunk))) > 0) {
@@ -111,6 +113,7 @@ BFileRequest::_ProtocolLoop()
 
 	if (fListener != NULL) {
 		fListener->ConnectionOpened(this);
+		fListener->HeadersReceived(this);
 
 		// Add a parent directory entry.
 		fListener->DataReceived(this, "+/,\t..\r\n", transferredSize, 8);