title: How to add new header from spring-module.xml
body: <p>I need to add header from spring-module.xml. I am getting below response</p>
  
  <pre><code>headers:    
  file_name:  sample.txt
  content_type:   text/plain
  
  Payload: { "json":{ "type":"abcd","value":"1234" }}
  </code></pre>
  
  <p>In the header I need to add another field like "time:timestamp" these header we should add from spring-module.xml only. Expecting headers like below.</p>
  
  <pre><code>headers:    
  file_name:  sample.txt
  content_type:   text/plain
  time:timestamp
  </code></pre>
  
  <p>below is my spring-module.xml file:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;beans:beans xmlns="http://www.springframework.org/schema/integration"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
         xmlns:int="http://www.springframework.org/schema/integration"
         xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                                   http://www.springframework.org/schema/beans/spring-beans.xsd
                                   http://www.springframework.org/schema/integration
                                   http://www.springframework.org/schema/integration/spring-integration.xsd
                                   http://www.springframework.org/schema/mvc
                                   http://www.springframework.org/schema/mvc/spring-mvc.xsd
                                   http://www.springframework.org/schema/context
                                   http://www.springframework.org/schema/context/spring-context.xsd"&gt;
  
  &lt;channel id="input"/&gt;
    &lt;transformer input-channel="input" output-channel="output"&gt;
      &lt;beans:bean class="com.sample.PayloadValidation" &gt;
      &lt;/beans:bean&gt;
    &lt;/transformer&gt;
  &lt;channel id="output"/&gt;
  
  &lt;/beans:beans&gt;
  </code></pre>
  
  <p>What are the changes I need to do add one more header like "time" from the spring-module.xml..?</p>