I believe you replace it with clean file from working mgmt. Here is mine on R81.20
Andy
[Expert@cpazuremgmt:0]# find / -name httpd2-smartview.conf
/web/conf/extra/httpd2-smartview.conf
[Expert@cpazuremgmt:0]# more /web/conf/extra/httpd2-smartview.conf
LoadModule proxy_module modules/libmod_proxy.so
LoadModule proxy_http_module modules/libmod_proxy_http.so
LoadModule proxy_wstunnel_module modules/libmod_proxy_wstunnel.so
ProxyErrorOverride On
<Location /smartview/PUSH/>
ProxyPass ws://127.0.0.1:8082/smartview/PUSH/
ProxyPassReverse ws://127.0.0.1:8082/smartview/PUSH/
</Location>
<Location /smartview/embedded/PUSH/>
ProxyPass ws://127.0.0.1:8082/smartview/embedded/PUSH/
ProxyPassReverse ws://127.0.0.1:8082/smartview/embedded/PUSH/
</Location>
<Location /smartview/editor/PUSH/>
ProxyPass ws://127.0.0.1:8082/smartview/editor/PUSH/
ProxyPassReverse ws://127.0.0.1:8082/smartview/editor/PUSH/
</Location>
<Location /smartview/viewer/PUSH/>
ProxyPass ws://127.0.0.1:8082/smartview/viewer/PUSH/
ProxyPassReverse ws://127.0.0.1:8082/smartview/viewer/PUSH/
</Location>
<Location /smartview>
#START_ACCESS_LIST
Require all granted
#END_ACCESS_LIST
<LimitExcept HEAD POST GET>
Require all denied
</LimitExcept>
ProxyPass http://127.0.0.1:8082/smartview
ProxyPassReverse http://127.0.0.1:8082/smartview
</Location>
<Location /smartview/pdf/>
Require all denied
</Location>
[Expert@cpazuremgmt:0]#