About the specification of squid cache

Issue

• The object is not cached by squid when a user browses a certain URL.
• There is the following setting by default in squid.conf.

   refresh_pattern -i (/cgi-bin/|\?) 0  0%  0

• We expect that this object is cached by removing the above setting. However, it was not cached.
• When we confirmed tcpdump, web server responded to squid "302 Moved Temporarily" not including Expires header.
• Is the reason that this object is not cached when the above-mentioned refresh_pattern is not set the 302 response not including Expires header?
• Does this specification, which 302 response not including Expires header is not cached, have priority over the processing of above-mentioned refresh_pattern?