如何获取setHeader覆盖现有的标头？

Question

I'm working on a CF interface to the ChromeLogger extension ( shameless plug ), which uses HTTP headers to log data from a server side language to the Chrome console.

Over the course of a request, the log() method can be called multiple times. For each call, I am writing the header in the format that ChromeLogger needs to display the data correctly. In CF10, this works fine - each subsequent call to setHeader() overwrites the previously set header with the same name. In CF9, however, I am seeing multiple headers with the same name.

This sample code demonstrates the issue:

<cfscript>
pc = getPageContext().getResponse();
pc.setHeader( "test-header", "value 1" );
pc.setHeader( "test-header", "value 2" );
pc.setHeader( "test-header", "value 3" );
</cfscript>

In CF9, I see three headers named "test-header," each with their own value. In CF10, I see one header named "test-header," with a value of "value 3." According to the Java docs for this method, the latter is correct (emphasis mine):

Sets a response header with the given name and value. If the header had already been set, the new value overwrites the previous one . The containsHeader method can be used to test for the presence of a header before setting its value.

Using the cfheader tag has the same results, presumably because it just wraps the setHeader() method.

I'm aware that I can build up the header over the course of the request and then call setHeader() one time at the end via onRequestEnd() , but I'd like this component to be as self-contained as possible - the less the end user has to modify their code to implement it, the better.

Is there any other way in CF9 to overwrite an existing header?

Answer 1

Looks like it could be a bug in ColdFusion 9. https://bugbase.adobe.com/index.cfm?event=bug&id=3041696 This bug was entered by Adam Cameron back in June 2010 for version 9.0 (as far as I can tell). It is listed with a status of 'Deferred' and reason of 'NotEnoughTime'.