How Can I Ensure Consistent Static Content Handling Across Different Web Application Containers?

Custom Servlet for Static Content Handling

When deploying a web application on different containers, inconsistencies in static content handling can arise. To remedy this issue, a custom servlet can be embedded within the webapp to handle static content in a consistent manner.

The desired servlet should meet the following criteria:

• No external dependencies
• Simple and reliable
• Support for If-Modified-Since header
• Optional features like gzip encoding and ETags

Proposed Solution

Instead of implementing a custom servlet, a modified servlet mapping can be employed. This approach involves explicitly mapping each static content file type to the default container servlet. By doing so, requests targeting specific resources are directed to the default servlet, while all other requests are handled by a dedicated servlet within the webapp.

Here is the modified servlet mapping configuration:

<servlet-mapping>   
    <servlet-name>default</servlet-name>
    <url-pattern>*.html</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.jpg</url-pattern>
</servlet-mapping>
<servlet-mapping>
 <servlet-name>default</servlet-name>
    <url-pattern>*.png</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.css</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
</servlet-mapping>

<servlet-mapping>
    <servlet-name>myAppServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

This mapping ensures that the default servlet will handle all content files based on their extension, while all other requests will be routed to the "myAppServlet."

Advantages of this Approach

This solution is advantageous for several reasons:

• It is compatible with both Jetty and Tomcat.
• It avoids the need for a custom servlet, which can simplify deployment and maintenance.
• It allows for flexible handling of static resources with granular control over URL mapping.

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