Nginx Echo Subrequest not working - macos

Question

I am new to Nginx.
My requirement is I need to make a service call but along with proxy passing that request, I need to make call to another service/servlet. For this I decided to use Echo module to use the echo_subrequest_async option.
However the subrequest is not working and even simple echo print is not working. Where does echo "hello" supposed to go? to the client side (my guess)
Below is my configuration (some notes):
Both the servers are java servers which are running on my local box
my os is mac osx version 10.9.5
3, I compile nginx 1.6.2 from source and with modules pcre and http echo
nginx version: nginx/1.6.2
built by clang 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
configure arguments: --with-pcre=/Users/xxxx/project/pcre-8.35 --add-module=/Users/xxxx/project/echo-nginx-module-0.57 --with-cc-opt=-Wno-deprecated-declarations
nginx config I have used is as follows
http {
server {
listen 80;
server_name localhost;
# this will handle the initial request
location /messaging-service {
default_type "text/plain";
echo "in the messaging service call";
echo_flush;
echo_subrequest_async GET '/mywebapp/second';
proxy_pass http://localhost:8090/messaging-service/;
}
# this is where the sub request should go,note its different service
location /mywebapp/second {
echo "Going to make another call on different server !!";
echo_flush;
proxy_pass http://localhost:8080/mywebapp/second/;
}
}
}