[jira] [Created] (TS-2342) problem with cache.cache_responses_to_cookies value 0

["Paul Marquess (JIRA)" <ji...@apache.org>]

Paul Marquess created TS-2342:
---------------------------------

             Summary: problem with cache.cache_responses_to_cookies value 0
                 Key: TS-2342
                 URL: https://issues.apache.org/jira/browse/TS-2342
             Project: Traffic Server
          Issue Type: Bug
          Components: Cache
            Reporter: Paul Marquess


I’m attempting to configure TS (3.2.0 but the issue seems to be present in 4.0.2 as well) to disable caching for all content where a cookie is present.  

Setting cache.cache_responses_to_cookies to 0 looks like it should do that according to the comment in records.config

   # cache responses to cookies has 5 options:
   #   0 - do not cache any responses to cookies
   #   1 - cache for any content-type
   #   2 - cache only for image types
   #   3 - cache for all but text content-types
   #   4 - cache for all but text content-types except OS response
   #       without "Set-Cookie" or with "Cache-Control: public"
   # See also cache-responses-to-cookies in cache.config.
CONFIG proxy.config.http.cache.cache_responses_to_cookies INT 1

Unfortunately when I set cache.cache_responses_to_cookies to 0 in records.config I don’t see anything written to the cache at all.

Am I correct in assuming that cache.cache_responses_to_cookies is intended to influence the caching of content only when a cookie is in play? So the behaviour I’m seeing is wrong?

Looking in do_cookiesprevent_caching in HttpTransact.cc it looks like the test for the 0 use case (COOKIES_CACHE_NONE) is done too early. Below is the code

  // Can cache all regardless of cookie header - just ignore all cookie headers
  if ((CookiesConfig) cookies_conf == COOKIES_CACHE_ALL) {
    return false;
  }
  // Do not cache if cookies option is COOKIES_CACHE_NONE
  if ((CookiesConfig) cookies_conf == COOKIES_CACHE_NONE) {
    return true;
  }

  ...
  if (!response->presence(MIME_PRESENCE_SET_COOKIE) &&
      !request->presence(MIME_PRESENCE_COOKIE) && (cached_request == NULL
                                                   || !cached_request->presence(MIME_PRESENCE_COOKIE))) {
    return false;
  }

I don’t see any other tests in the code that check for cookies that would be triggered before do_cookiesprevent_caching is invoked, so surely the COOKIES_CACHE_NONE test needs to be done after the presence of cookies headers has been determined?

So the code would become

  // Can cache all regardless of cookie header - just ignore all cookie headers
  if ((CookiesConfig) cookies_conf == COOKIES_CACHE_ALL) {
    return false;
  }
...
  if (!response->presence(MIME_PRESENCE_SET_COOKIE) &&
      !request->presence(MIME_PRESENCE_COOKIE) && (cached_request == NULL
                                                   || !cached_request->presence(MIME_PRESENCE_COOKIE))) {
    return false;
  }

  // Know we have a cookie present at this point

  // Do not cache if cookies option is COOKIES_CACHE_NONE
  // and cookie detected
  if ((CookiesConfig) cookies_conf == COOKIES_CACHE_NONE) {
    return true;
  }




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