Update nginx.conf for working post requests

testapp/nginx.conf

-
 pid nginx.pid;
 error_log nginx.err.log;
 
@@ -48,6 +47,9 @@ http {
 			proxy_set_header X-CLIENT-ID "test";
 			proxy_set_header X-CLIENT-SECRET "testsecret";
 			proxy_pass http://localhost:5002/;
+			# those options are needed to have working POST requests
+			proxy_set_header Content-Length ""
+			proxy_pass_request_body off
 		}
 
 		error_page 401 = @error401;