Apache reverse proxy 2.4

We are configuring apache 2.4 for our reverse proxy.

<VirtualHost vhost:8008>
ServerName vhost
LogLevel trace8
    HttpProtocolOptions Unsafe
    SSLProxyEngine On
    SSLProxyCACertificateFile ${SSL_PROXY_CA_CERT_FILE}
    SSLProxyVerify none
    #SSLProxyVerifyDepth 3
    SSLProxyMachineCertificateFile ${SSL_PROXY_MACHINE_CERT_FILE}
    SSLOptions +ExportCertData
#
SSLProxyCheckPeerCN off
SSLProxyCheckPeerName off
SSLProxyCheckPeerExpire off
ProxyAddHeaders off
ProxyPreserveHost off

#
    <Proxy *>
    </Proxy>      
      ProxyPass        /vol.Out/    https://server:443/ Keepalive=On
      ProxyPassReverse /vol.Out/    https://server:443/
</VirtualHost>

Getting 502 error when we do a POST but we are able to get 200 when using GET request. Trying to connect from http (port 8008) to a remote server https site.

Error

[Mon Mar 07 14:15:24.154933 2022] [ssl:trace3] [pid 21941] ssl_engine_kernel.c(1780): [remote <RemoteServerIP>:443] OpenSSL: Loop: SSLv3 read finished A
[Mon Mar 07 14:15:24.154947 2022] [ssl:trace3] [pid 21941] ssl_engine_kernel.c(1775): [remote <RemoteServerIP>:443] OpenSSL: Handshake: done
[Mon Mar 07 14:15:24.154957 2022] [ssl:debug] [pid 21941] ssl_engine_kernel.c(1824): [remote <RemoteServerIP>:443] AH02041: Protocol: TLSv1.2, Cipher: ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
[Mon Mar 07 14:15:24.155378 2022] [core:trace6] [pid 21941] core_filters.c(525): [remote <RemoteServerIP>:443] core_output_filter: flushing because of THRESHOLD_MAX_BUFFER
[Mon Mar 07 14:15:24.164778 2022] [ssl:info] [pid 21941] (104)Connection reset by peer: [remote <RemoteServerIP>:443] AH01993: SSL output filter write failed.
[Mon Mar 07 14:15:24.164816 2022] [proxy:error] [pid 21941] (104)Connection reset by peer: [client <From7514>:51230] AH01084: pass request body failed to <RemoteServerIP>:443 (<serverhost>)
[Mon Mar 07 14:15:24.164824 2022] [proxy_http:error] [pid 21941] [client <From7514>:51230] AH01097: pass request body failed to <RemoteServerIP>:443 (<serverhost>) from <From7514> ()
[Mon Mar 07 14:15:24.164829 2022] [proxy:debug] [pid 21941] proxy_util.c(2224): AH00943: HTTPS: has released connection for (<serverhost>)

This is on Apache version Server version: Apache/2.4.6 (Red Hat Enterprise Linux)

[07/Mar/2022:14:15:24 -0500] "POST /vol.Out/HTTP/1.1" 502 232 "-" "-"