Thank you, this resolves the problem with the Content-Type being sent when the script is NPH and using the CGI method. However, it does not appear to resolve the Connection: Keep-Alive issue, the connection is still being closed when the script finishes.

My script is calculating the body length and sending the Content-Length header, aswell as any other headers that are specified in the rfc.

304 Example using:
print header(-status => '304 Not Modified', -nph => 1, -type => '', -connection => 'Keep-Alive', 'Keep-Alive' => 'timeout=15, max=100');

Here is the connection closing after issueing the 304:

GET /nph-test.pl HTTP/1.1
Host: www.xyz.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.0.7
+) Gecko/2009021910 Firefox/3.0.7 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.
+8,text/vnd.wap.wml;q=0.6
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

HTTP/1.1 304 Not Modified
Server: Apache/1.3.26 (Unix)  (Red-Hat/Linux) FrontPage/5.0.2.2510
Status: 304 Not Modified
Date: Tue, 24 Mar 2009 14:40:18 GMT
keep-alive: timeout=15, max=100
connection: Keep-Alive

Connection closed by foreign host.

[download]

And here after serving a page:

GET /nph-servefiles.pl HTTP/1.1
Host: www.xyz.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.0.7
+) Gecko/2009021910 Firefox/3.0.7 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.
+8,text/vnd.wap.wml;q=0.6
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

HTTP/1.1 200 OK
Accept-Ranges: none
Expires: Sun, 20 Mar 2011 18:56:47 GMT
Server: Apache/1.3.26 (Unix)  (Red-Hat/Linux) FrontPage/5.0.2.2510
Vary: Accept,Accept-Encoding,User-Agent
Content-Length: 20
Etag: "06f0001f16dfd8b9632cc9640d62e5e0-gzip"
Cache-Control: s-maxage=1209600,proxy-revalidate,must-revalidate, max-
+age=62741536
Content-Encoding: gzip
Last-Modified: Tue, 24 Mar 2009 02:04:17 GMT
Date: Tue, 24 Mar 2009 14:56:01 GMT
Connection: Keep-Alive
Content-Type: application/xhtml+xml, charset=utf-8
Keep-Alive: timeout=15,max=100

Connection closed by foreign host.

[download]

And here 2 requests not using a script:

GET /images/validate.gif HTTP/1.1
Host: www.xyz.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.0.7
+) Gecko/2009021910 Firefox/3.0.7 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.
+8,text/vnd.wap.wml;q=0.6
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

HTTP/1.1 200 OK
Date: Tue, 24 Mar 2009 14:44:31 GMT
Server: Apache/1.3.26 (Unix)  (Red-Hat/Linux) FrontPage/5.0.2.2510
Cache-Control: s-maxage=1209600,proxy-revalidate,must-revalidate, max-
+age=62741536
Expires: Sun, 20 Mar 2011 18:56:47 GMT
Last-Modified: Fri, 20 Mar 2009 18:56:47 GMT
ETag: "92042c-1bd8-49c3e6ef"
Accept-Ranges: bytes
Content-Length: 7128
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: image/gif

GET /images/validate.gif HTTP/1.1
Host: www.xyz.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.0.7
+) Gecko/2009021910 Firefox/3.0.7 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.
+8,text/vnd.wap.wml;q=0.6
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

HTTP/1.1 200 OK
Date: Tue, 24 Mar 2009 14:44:48 GMT
Server: Apache/1.3.26 (Unix)  (Red-Hat/Linux) FrontPage/5.0.2.2510
Cache-Control: s-maxage=1209600,proxy-revalidate,must-revalidate, max-
+age=62741519
Expires: Sun, 20 Mar 2011 18:56:47 GMT
Last-Modified: Fri, 20 Mar 2009 18:56:47 GMT
ETag: "92042c-1bd8-49c3e6ef"
Accept-Ranges: bytes
Content-Length: 7128
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Content-Type: image/gif

[download]

Any further information appreciated

In reply to Re^2: NPH and Connection: Keep-Alive by gfairweather
in thread NPH and Connection: Keep-Alive by gfairweather

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