What is Correlation?

Correlation is the capturing of dynamic values
passed from the client to the server and used
to send the response based on these dynamic
values.
Why Correlation is needed?

Sometimes you need to send response based
on request data. HPD supports this feature.
You can send response based on request
data.

$HPD_ROOT/correlation/[<project dir>]/<host
name>/services/<service name>/
◦ project dir: This is optional.
◦ host name: host name is optional in service definition. In this
case, its value will be ‘default’. Currently this is set to “default”
directory.
◦ services: This directory to hold all services directory.
◦ service name: This is name of correlation service. There can be
multiple services with different names.
◦ Each correlation service will have following files:
 service.conf - Service configuration file that contains information
for different response templates, parameters, advance settings etc.
 service.c - This is optional that contains C code for call back
methods.
 service.history  service.comments – It contains information for service which can be
edited/viewed from GUI.
 data file – used in file and index file parameter
 <Response file> - <service name>_<template name><content type
of response file>
 <Request file> - <Response file>.req

This file is to specify all global properties for all
correlation services. Default global properties are –
◦ CORRELATION_DIR <User Dir> - User can set own dir
using this keyword under $HPD_ROOT/correlation for
services. Default is no dir so all services are under
$HPD_ROOT/correlation/<host name>/. If you are using
CORRELATION_DIR, then all global settings are taken from
$HPD_ROOT/correlation/< User Dir >/correlation.conf file,
not from $HPD_ROOT/correlation/correlation.conf file.
◦ SET_CR_URL_HEADER Connection: Keep-Alive - It is
important to set this Connection: Keep-Alive as
wget wait for connection to be closed from HPD in
absence of this header. Wget is used in Test
Service.

There are two ways to create correlation
services:
 Capturing
 Manual