uwsgi caching issue

daft.astacy.yaml

uwsgi:
  http-socket: 0.0.0.0:8001
  master: true
  processes: 1
  module: spire.runtime.uwsgi
  static-map: /static=static

request.txt

GET /static/components/lookandfeel/daft.css HTTP/1.1
Host: localhost:8001
Connection: keep-alive
Cache-Control: max-age=0
If-Modified-Since: Mon, 05 Nov 2012 13:41:43 GMT
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.18 (KHTML, like Gecko) Chrome/25.0.1317.0 Safari/537.18
Accept: */*
Referer: http://localhost:8001/infoset/00000000-0000-0000-0000-000000000000/filter
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: sessionid=bddc9acfa39149128a35b4d7517814ed62d55c36

response.txt

HTTP/1.1 304 Not Modified
Cache-Control: must-revalidate, no-cache

system-state.txt

§ stat -x static/components/lookandfeel/daft.css 
  File: "static/components/lookandfeel/daft.css"
  Size: 25494        FileType: Regular File
  Mode: (0644/-rw-r--r--)         Uid: (  501/  astacy)  Gid: (   20/   staff)
Device: 1,4   Inode: 10134828    Links: 1
Access: Mon Nov  5 08:23:16 2012
Modify: Mon Nov  5 08:11:22 2012
Change: Mon Nov  5 08:11:22 2012

§ date
Mon Nov  5 08:36:47 CST 2012

uwsgi-cmd.sh

uwsgi --virtualenv .virtualenv \
  --touch-reload daft.astacy.yaml \
  --touch-reload daft/__init__.py \
  --touch-reload daft/context_processors.py \
  --touch-reload daft/urls.py \
  --touch-reload daft/views.py \
  --touch-reload node_modules/siq-lookandfeel/strings.yaml \
  --add-header Cache-Control: must-revalidate, no-cache \
  --static-map /static/components/auxl=/Users/astacy/work/auxl/src \
  --static-map /static/components/bedrock=/Users/astacy/work/bedrockjs/src \
  --static-map /static/components/csi=/Users/astacy/work/csi/src \
  --static-map /static/components/daft=/Users/astacy/work/daft/src \
  --static-map /static/components/dax=/Users/astacy/work/dax/src \
  --static-map /static/components/gloss=/Users/astacy/work/gloss/src \
  --static-map /static/components/lookandfeel=/Users/astacy/work/lookandfeel/src \
  --static-map /static/components/mesh=/Users/astacy/work/mesh/js \
  --static-map /static/components/vendor=/Users/astacy/work/vendorjs/src \
  --mime-file /Users/astacy/code/siq/bin/../etc/mime.types \
  --workers 2 \
  --yaml daft.astacy.yaml