Bug#985370: apache2: HEAD requests are empty when mod_ratelimit is enabled

[Jan Moskyto Matejka <mq@jmq.cz>]

Package: apache2
Version: 2.4.38-3+deb10u4
Severity: normal

Dear Maintainer,

I have set up a site with mod_ratelimit enabled. Then HEAD requests sent
by curl are logged as sent (with some size), anyway curl reports

  url: (52) Empty reply from server

Disabling the rate limit (while keeping the mod loaded) makes HEAD
requests work OK.

-- Package-specific info:

-- System Information:
Debian Release: 10.8
  APT prefers stable
  APT policy: (700, 'stable'), (650, 'testing'), (500, 'stable-updates'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-14-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=cs_CZ.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages apache2 depends on:
ii  apache2-bin    2.4.38-3+deb10u4
ii  apache2-data   2.4.38-3+deb10u4
ii  apache2-utils  2.4.38-3+deb10u4
ii  dpkg           1.18.22
ii  lsb-base       9.20161125
ii  mime-support   3.60
pn  perl:any       <none>
ii  procps         2:3.3.12-3+deb9u1

Versions of packages apache2 recommends:
ii  ssl-cert  1.0.38

Versions of packages apache2 suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
ii  elinks [www-browser]                             0.12~pre6-12
ii  firefox-esr [www-browser]                        78.8.0esr-1~deb10u1
ii  links [www-browser]                              2.14-2
ii  w3m [www-browser]                                0.5.3-34

Versions of packages apache2-bin depends on:
ii  libapr1                  1.6.5-1+b1
ii  libaprutil1              1.6.1-4
ii  libaprutil1-dbd-sqlite3  1.6.1-4
ii  libaprutil1-ldap         1.6.1-4
ii  libbrotli1               1.0.7-2+deb10u1
ii  libc6                    2.28-10
ii  libcurl4                 7.64.0-4+deb10u1
ii  libjansson4              2.12-1
ii  libldap-2.4-2            2.4.47+dfsg-3+deb10u6
ii  liblua5.2-0              5.2.4-1.1+b1
ii  libnghttp2-14            1.36.0-2+deb10u1
ii  libpcre3                 2:8.39-2
ii  libssl1.1                1.1.1d-0+deb10u5
ii  libxml2                  2.9.4+dfsg1-2.2+deb9u2
pn  perl:any                 <none>
ii  zlib1g                   1:1.2.11.dfsg-1

Versions of packages apache2-bin suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
ii  elinks [www-browser]                             0.12~pre6-12
ii  firefox-esr [www-browser]                        78.8.0esr-1~deb10u1
ii  links [www-browser]                              2.14-2
ii  w3m [www-browser]                                0.5.3-34

Versions of packages apache2 is related to:
ii  apache2      2.4.38-3+deb10u4
ii  apache2-bin  2.4.38-3+deb10u4

-- no debconf information