[Bug 59744] AH00717: Premature end of cache headers

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=59744

--- Comment #4 from Alex Regan <my...@gmail.com> ---
I'm using apache-2.4.53 and I'm still having problems with caching. Perodically
I see errors related to "premature end of cache headers" and don't know how to
troubleshoot it. This is on fedora34. The site is using Cloudflare. This is
with loglevel cache_disk:trace3

    [Wed Jul 06 04:23:49.577237 2022] [cache_disk:error] [pid 3202400:tid
3202451] (70014)End of file found: [client 162.158.190.138:47866] AH00717:
Premature end of cache headers.
    [Wed Jul 06 04:23:49.577247 2022] [cache_disk:debug] [pid 3202400:tid
3202451] mod_cache_disk.c(883): [client 162.158.190.138:47866] AH02987: Error
reading response headers from
/var/cache/httpd/W_@/Ro6/7ihAG5M_Eyw0t7jA.header.vary/@Iu/98u/9@ot3lTARaKl3p8g.header
for https://example.com:443/index.php?

The 162.158.190.138 is a cloudflare address.

I don't know how to reproduce it. Where do I start to look?

I can correlate the lines from the error_log with the access_log based on time,
but I can't be sure they're directly related. There were three requests during
that same second, all of which were bots. One was a 200, one was a 301 and one
was a 404 for a file that was never there.

The file the error_log references is there on the filesystem:

    find . -name \*7ihAG5M_Eyw0t7jA\*
    ./W_@/Ro6/7ihAG5M_Eyw0t7jA.header.vary
    ./W_@/Ro6/7ihAG5M_Eyw0t7jA.header

Here are the cache options from the virtual host config:

    CacheQuickHandler off
    CacheLock on
    CacheLockPath /tmp/mod_cache-lock
    CacheLockMaxAge 5
    CacheIgnoreHeaders Set-Cookie
    CacheRoot "/var/cache/httpd"
    # Enable the X-Cache-Detail header
    CacheDetailHeader on
        CacheEnable disk "/"
        CacheHeader on
        CacheDefaultExpire 800
        CacheMaxExpire 64000
        CacheIgnoreNoLastMod On
        CacheDirLevels 2
        CacheDirLength 3

I also notice the cache directory (/var/cache/httpd) grows boundlessly. At one
time htcacheclean was running from systemd, but that doesn't look to be the
case any longer. 

Should I be investigating the HTTP cache control headers? Is that related or
helpful?

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