How Can a Custom Servlet Solve Static Content Serving Inconsistencies Across Different Web Containers?

Serving Static Content with a Custom Servlet

Background

When deploying a web application across multiple containers, variations in the handling of URLs for static content can pose challenges. To address this, a custom servlet is sought to manage the serving of static assets with specific features.

Custom Servlet Requirements

The ideal servlet should possess the following capabilities:

• No external dependency
• Simplicity and reliability
• Support for "If-Modified-Since" header
• Optional support for gzip encoding and etags

Potential Solutions

One suggestion is to utilize Example 4-10 from the Servlet Book. However, this option does not fully meet the URL structure requirements.

Modified Solution

A different mapping approach has been proposed:

<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 designates all content files by extension to the default servlet and everything else to the custom servlet "myAppServlet."

Conclusion

This modified mapping strategy ensures consistent behavior in both Jetty and Tomcat containers, effectively addressing the URL structure requirements for serving static content.

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