How to write regex for apache ProxyPassMatch to reverse proxy API calls

 Step 1) Shutdown apache 

Step 2) Edit httpd.conf file and add the following modules.

 LoadModule proxy_module modules/mod_proxy.so

LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so

LoadModule proxy_balancer_module modules/mod_proxy_balancer.so

LoadModule proxy_http_module modules/mod_proxy_http.so

Step 3) Add the required configs for Reverse proxy on httpd.conf  file

ProxyRequests Off

ProxyPreserveHost On

ProxyPassMatch "/api(.*)" "http://localhost:9000/api$1"

ProxyPassReverse "/api(.*)" "http://localhost:9000/api$1"

Step 4) Startup Apache instance