"Page cannot be displayed" error when attempting to download large dataset.

Question

In the following code, can anybody please tell me at what point the data actually starts to get transferred and the popup "download file" box appears? I'm thinking that the dialog box should appear on the first outputstream.write and start transferring data. However, I think it's not transferring the data until the while loop has finished! That's bad because this is a real long process and I eventually get "Page cannot be displayed" error. On a smaller dataset (shorter while loop) everything seems to work correctly. Is there some sort of a web server configuration that tells it to write out the data ONLY if outputstream closes? I really need it to write out the data as it's coming in. Code is below and thanks in advance.
response.setHeader("Expires", "0");
response.setHeader("Content-disposition","inline;filename=Download.csv");
response.setContentType("application/x-msdownload");
outputStream = response.getOutputStream();
bufferInBytes = this.getData();
while (bufferInBytes != null)
outputStream.write(bufferInBytes, 0, bufferInBytes.length);
outputStream.flush();
bufferInBytes = this.getData();
outputStream.close();

Answer 1

Hi All,
Thanks for all your help.
Seems I already found out the issue.
Since we are using "Personal Home Page" for the system profile option "Self Service Personal Home Page Mode" I checked oracle note and found out
that 11i did not support this mode. Maybe this is the problem that is why we are getting page cannot be displayed error when only 1 responsibility is active.
The way to fix this, is to use mode 'Framework Only' instead of 'Personal Home Page' as Oracle are phasing out mod_plsql based UI and it will not be present in future releases. No maintenance is being performed (i.e. bug fixes) to the mod_plsql based UI technology.
Please check this note for more clearer explanation:
Is The 'Personal Home Page' Mode Supported In Oracle 11i Applications? [ID 368628.1]
Again, thank you for your help!