Set HTTP headers properly to force caching on JS, CSS and PNG files
browser-cache, glassfish, jsf, servlet-filters
Solution
Just make use of JSF builtin resource handler. I.e. use `<h:outputStylesheet name>`, `<h:outputScript name>` and `<h:graphicImage name>` with files in `/resources` folder instead of "plain vanilla" `<link rel="stylesheet">`, `<script>` and `<img>`.
<h:outputStylesheet name="css/style.css" />
<h:outputScript name="js/script.js" />
<h:graphicImage name="images/logo.png" />
This way you don't need to worry about resource caching at all. JSF builtin resource handler has already set the necessary response headers. The expiration time defaults already to 1 week.
In Mojarra you can control the expiration time by the following context parameter (the value is in millis):
<context-param>
<param-name>com.sun.faces.defaultResourceMaxAge</param-name>
<param-value>3628800000</param-value> <!-- 6 weeks. -->
</context-param>
And in MyFaces:
<context-param>
<param-name>org.apache.myfaces.RESOURCE_MAX_TIME_EXPIRES</param-name>
<param-value>3628800000</param-value> <!-- 6 weeks. -->
</context-param>
See also:
- How to reference CSS / JS / image resource in Facelets template?
- What is the JSF resource library for and how should it be used?
Problem
How can I tell to GlassFish server, to store all JS, CSS and PNG files into browser cache in order to reduce HTTP GET requests? I am using JSF and PrimeFaces.