Description:
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We want a script to make a redirect and then make some Sql-queries, so that the user would not wait for the queries to execute (sometimes they may take too long). I added 

echo("-"); flush();

after sending the Location header which made PHP send the header immediately away, but the problem is IE does not make the redirect as soon as it gets the header - probably it expects other headers or a page, so it only redirects after the script completes. If I add more output after that and a flush() call then PHP won't output anything else until the script completes. This is emulated with a sleep(3) call. More precisely, PHP only sends headers immediately, it doesn't send anything else (the dash in this case). 

Reproduce code:
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//This is the redirect
header("Location: http://hotelsys.biz/hotels/Bali");
//This is how I force PHP to send it right away
echo("-"); flush();
//This is how I cannot make PHP send anything else
echo(str_repeat("-", 1024*16)); flush();
//Pause emulation
sleep(3);
//the end - this is when the browser gets the output
exit;


Expected result:
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The first "-" character and the next 16K of it sent right away. 

Actual result:
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I only get dashes in 3 seconds; the browser (IE) makes the redirect in this time too.