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setting cache-control headers in response; ultimately being ignored
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setting cache-control headers in response; ultimately being ignored


  • Subject: setting cache-control headers in response; ultimately being ignored
  • From: William Hatch <email@hidden>
  • Date: Sat, 08 Nov 2008 14:01:14 -0500
  • Resent-date: Sun, 09 Nov 2008 09:19:25 -0500
  • Resent-from: William Hatch <email@hidden>
  • Resent-message-id: <email@hidden>
  • Resent-to: Apple WO-Dev <email@hidden>


My goal is to have a da which responds to a request from a content delivery network where the response headers control how long the cdn cache's a resource associated with a given url. Generating the response is fine, but I'm having trouble getting the cache-control header set properly, according to my log and the wonder log statements. I'm doing the following where r is my WOResponse object and maxAge is a string equal to 1d:


r.removeHeadersForKey("cache-control");
r.removeHeadersForKey("pragma");
r.setHeader(("max-age=" +maxAge), "cache-control");

when I explicitly log out the response right after these calls, it looks good:

headers={cache-control=[max-age=1d], content-length=[308], content- type=[application/text/html; charset=utf-8], keep-alive=[Connection]} content-length=308 cookies=null userInfo={} storePageInBacktrackCache=true >) status=200>


however, ERXApplication.RequestHandling logging indicates that they're getting reset and ignoring what I had previously set; max-age is zero and all the other options seem to indicate "don't cache this..."


headers={cache-control=[private, no-cache, no-store, must-revalidate, max-age=0], content-length=[308], content-type=[application/text/html; charset=utf-8], date=[Sat, 08-Nov-2008 18:45:31 GMT], expires=[Sat, 08- Nov-2008 18:45:31 GMT], keep-alive=[Connection], pragma=[no-cache], set-cookie=[], x-webobjects-loadaverage=[2]} content-length=308 cookies=() userInfo={} storePageInBacktrackCache=true >) status=200>

Sorry if this is basic; I've never screwed around with these specific headers before other than wacking them to get pdf download to work. Am I doing something wrong to set the cache-control, or something else, or what? Thanks.

Bill



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