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Subject: [Bug 59658] New: CacheIgnoreNoLastMod doc and code don't agree
Date: Thu, 02 Jun 2016 17:49:11 +0000
Message-ID: <bug-59658-56585@https.bz.apache.org/bugzilla/>
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archived-at: Thu, 02 Jun 2016 17:49:15 -0000

https://bz.apache.org/bugzilla/show_bug.cgi?id=59658

            Bug ID: 59658
           Summary: CacheIgnoreNoLastMod doc and code don't agree
           Product: Apache httpd-2
           Version: 2.5-HEAD
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Documentation
          Assignee: docs@httpd.apache.org
          Reporter: covener@gmail.com

CacheIgnoreNoLastMod is supposed to ignore missing Last-Modified, but it only
has any effect when there is also no ETAG on the response.

Manual:

Ordinarily, documents without a last-modified date are not cached. Under some
circumstances the last-modified date is removed (during mod_include processing
for example) or not provided at all. The CacheIgnoreNoLastMod directive
provides a way to specify that documents without last-modified dates should be
considered for caching, even without a last-modified date. If neither a
last-modified date nor an expiry date are provided with the document then the
value specified by the CacheDefaultExpire directive will be used to generate an
expiration date.

caching.html:
If the response has a status of 200 (OK), the response must also include at
least one of the "Etag", "Last-Modified" or the "Expires" headers, or the
max-age or s-maxage directive of the "Cache-Control:" header, unless the
CacheIgnoreNoLastMod directive has been used to require otherwise.


    else if (r->status == HTTP_OK && lastmods == NULL && etag == NULL && (exps
            == NULL) && (dconf->no_last_mod_ignore == 0) && !control.max_age
            && !control.s_maxage) {
        /* 200 OK response from HTTP/1.0 and up without Last-Modified,
         * Etag, Expires, Cache-Control:max-age, or Cache-Control:s-maxage
         * headers.
         */
        /* Note: mod-include clears last_modified/expires/etags - this
         * is why we have an optional function for a key-gen ;-)
         */
        reason = "No Last-Modified; Etag; Expires; Cache-Control:max-age or
Cache-Control:s-maxage headers";
    }

Not really clear if this is a docs bug or not, but I lean towards doc.

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