Description:
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I'm also using the FastCGI ISAPI dll from here:
http://www.caraveo.com/fastcgi/

The problem I was seeing was when redirecting from an https page to any other page by means of the Location: header in Apple's Safari browser. The browser would hang.

I used wget to look at the headers and got this:
 1 HTTP/1.1 302 Moved
 2 Server: Microsoft-IIS/5.0
 3 Date: Tue, 19 Aug 2003 22:29:13 GMT
 4 (null)
 5 Content-type: text/html
 6 X-Powered-By: PHP/4.3.2
 7 Location: http://ecomdev.mos.org/?action=showorder

Note the (null) line. Is php adding a line feed, carriage return, or some other character?

I set 'cgi.rfc2616_headers = 0' in php.ini, and the mystery (null) went away. I had originally set it to '1' because the comments in php.ini said to if using IIS.

This problem did not occur with the ISAPI module or plain CGI, with either setting of 'cgi.rfc2616_headers'.

Changing the 'cgi.rfc2616_headers' setting has solved my Safari hanging problem.