Update Apache configuration. This has been tested.

installation/pleroma-apache.conf

-# default Apache site config for Pleroma
-#
-# needed modules: define headers proxy proxy_http proxy_wstunnel rewrite ssl
-# optional modules: cache cache_disk
+# Sample Apache config for Pleroma
 #
 # Simple installation instructions:
-# 1. Install your TLS certificate, possibly using Let's Encrypt.
-# 2. Replace 'example.tld' with your instance's domain wherever it appears.
-# 3. This assumes a Debian style Apache config. Copy this file to
-#    /etc/apache2/sites-available/ and then add a symlink to it in
-#    /etc/apache2/sites-enabled/ by running 'a2ensite pleroma-apache.conf', then restart Apache.
+# 1. Install your TLS certificate. We recommend using Let's Encrypt via Certbot
+# 2. Replace 'example.tld' with your instance's domain.
+# 3. This assumes a Debian-style Apache config. Copy this file to
+#    /etc/apache2/sites-available/ and then activate the site by running
+#    'a2ensite pleroma-apache.conf', then restart Apache.
 #
 # Optional: enable disk-based caching for the media proxy
 # For details, see https://git.pleroma.social/pleroma/pleroma/wikis/How%20to%20activate%20mediaproxy
 #
-# 1. Create the directory listed below as the CacheRoot, and make sure
+# 1. Create a directory as shown below for the CacheRoot and make sure
 #    the Apache user can write to it.
 # 2. Configure Apache's htcacheclean to clean the directory periodically.
-# 3. Run 'a2enmod cache cache_disk' and restart Apache.
+#    Your OS may provide a service you can enable to do this automatically.
 
 Define servername example.tld
 
+<IfModule !proxy_module>
+    LoadModule proxy_module libexec/apache24/mod_proxy.so
+</IfModule>
+<IfModule !proxy_http_module>
+    LoadModule proxy_http_module libexec/apache24/mod_proxy_http.so
+</IfModule>
+<IfModule !proxy_wstunnel_module>
+    LoadModule proxy_wstunnel_module libexec/apache24/mod_proxy_wstunnel.so
+</IfModule>
+<IfModule !rewrite_module>
+    LoadModule rewrite_module libexec/apache24/mod_rewrite.so
+</IfModule>
+<IfModule !ssl_module>
+    LoadModule ssl_module libexec/apache24/mod_ssl.so
+</IfModule>
+<IfModule !cache_module>
+    LoadModule cache_module libexec/apache24/mod_cache.so
+</IfModule>
+<IfModule !cache_disk_module>
+    LoadModule cache_disk_module libexec/apache24/mod_cache_disk.so
+</IfModule>
+
 ServerName ${servername}
 ServerTokens Prod
 
-ErrorLog ${APACHE_LOG_DIR}/error.log
-CustomLog ${APACHE_LOG_DIR}/access.log combined
+# If you want Pleroma-specific logs
+#ErrorLog /var/log/httpd-pleroma-error.log
+#CustomLog /var/log/httpd-pleroma-access.log combined
 
 <VirtualHost *:80>
-    Redirect permanent / https://${servername}
+    RewriteEngine on
+    RewriteCond %{SERVER_NAME} =${servername}
+    RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
 </VirtualHost>
 
 <VirtualHost *:443>
     SSLEngine on
     SSLCertificateFile      /etc/letsencrypt/live/${servername}/fullchain.pem
     SSLCertificateKeyFile   /etc/letsencrypt/live/${servername}/privkey.pem
+    # Make sure you have the certbot-apache module installed
+    Include /etc/letsencrypt/options-ssl-apache.conf
 
-    # Mozilla modern configuration, tweak to your needs
-    SSLProtocol             all -SSLv3 -TLSv1 -TLSv1.1
-    SSLCipherSuite          ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
-    SSLHonorCipherOrder     on
-    SSLCompression          off
-    SSLSessionTickets       off
-
-    # uncomment the following to enable mediaproxy caching on disk
-    # <IfModule mod_cache_disk.c>
-    #     CacheRoot /var/cache/apache2/mod_cache_disk
-    #     CacheDirLevels 1
-    #     CacheDirLength 2
-    #     CacheEnable disk /proxy
-    #     CacheLock on
-    # </IfModule>
+    # Uncomment the following to enable MediaProxy caching on disk
+    #CacheRoot /tmp/pleroma-media-cache/
+    #CacheDirLevels 1
+    #CacheDirLength 2
+    #CacheEnable disk /proxy
+    #CacheLock on
+    #CacheHeader on
+    #CacheDetailHeader on
+    ## 16MB max filesize for caching, configure as desired
+    #CacheMaxFileSize 16000000
+    #CacheDefaultExpire 86400
 
     RewriteEngine On
     RewriteCond %{HTTP:Connection} Upgrade [NC]
     RewriteCond %{HTTP:Upgrade} websocket [NC]
-    RewriteRule /(.*) ws://localhost:4000/$1 [P,L]
+    RewriteRule /(.*) ws://127.0.0.1:4000/$1 [P,L]
 
+    #ProxyRequests must be off or you open your server to abuse as an open proxy
     ProxyRequests off
-    # this is explicitly IPv4 since Pleroma.Web.Endpoint binds on IPv4 only
-    # and `localhost.` resolves to [::0] on some systems: see issue #930
     ProxyPass / http://127.0.0.1:4000/
     ProxyPassReverse / http://127.0.0.1:4000/
-
-    RequestHeader set Host ${servername}
     ProxyPreserveHost On
 </VirtualHost>
-
-# OCSP Stapling, only in httpd 2.3.3 and later
-SSLUseStapling          on
-SSLStaplingResponderTimeout 5
-SSLStaplingReturnResponderErrors off
-SSLStaplingCache        shmcb:/var/run/ocsp(128000)