tracker issue : CF-3926479

A simple request with no cfcontent/cfheaders involved is returning this:

	HTTP/1.1 200 OK
	Server: Apache-Coyote/1.1
	Cache-Control: no-cache, no-store, must-revalidate, max-age=0
	Pragma: no-cache
	Expires: Thu, 01 Jan 1970 00:00:00 GMT
	Content-Type: text/html;charset=UTF-8
	Transfer-Encoding: chunked
	Date: Fri, 23 Jan 2015 12:03:12 GMT

The Cache-Control, Pragma, and first Expires header should not be there. There is no CFML code adding them. (The page is being requested, not refreshed nor force refreshed.)

Setting an Expires header manually is appending to the existing incorrect header, for example:

	<cfheader name="Expires" value=#getHttpTimeString(Now()+10)# />
	<cfoutput>#Now()#</cfoutput>
	<cfsetting showdebugoutput=false />

Results in this response:

	HTTP/1.1 200 OK
	Server: Apache-Coyote/1.1
	Cache-Control: no-cache, no-store, must-revalidate, max-age=0
	Pragma: no-cache
	Expires: Thu, 01 Jan 1970 00:00:00 GMT
	Expires: Mon, 02 Feb 2015 12:03:41 GMT
	Content-Type: text/html;charset=UTF-8
	Transfer-Encoding: chunked
	Date: Fri, 23 Jan 2015 12:03:41 GMT

The Cache-Control, Pragma, and first Expires header should not be there. There is no CFML code adding them.

This occurs when going via Tomcat's Coyote web server, but going via IIS results in the same behaviour.

This is happening in all browsers, and can be confirmed as not a browser issue by sending a manual HTTP request (e.g. using PuTTY)...

Using this code:

	<cfdump var=#getHttpRequestData().headers# format=text />
	<cfsetting showdebugoutput=false />

Then connecting to 127.0.0.1:8500 and sending this HTTP request:

	GET /test_expires.cfm HTTP/1.1
	Host: localhost
	
Results in the response:

	HTTP/1.1 200 OK
	Server: Apache-Coyote/1.1
	Set-Cookie: JSESSIONID=35BF5B5408B900B856D25B95F69F8161.cfusion; Path=/; HttpOnly
	Cache-Control: no-cache, no-store, must-revalidate, max-age=0
	Pragma: no-cache
	Expires: Thu, 01 Jan 1970 00:00:00 GMT
	Content-Type: text/html;charset=UTF-8
	Transfer-Encoding: chunked
	Date: Fri, 23 Jan 2015 12:05:16 GMT
	
	2c
	<pre>struct
	
	host: localhost
	</pre>

----------------------------- Additional Watson Details -----------------------------

Watson Bug ID:	3926479

External Customer Info:
External Company:  
External Customer Name: Peter
External Customer Email:  
External Test Config: My Hardware and Environment details:

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