https://github.com/ggrandes/concurrentlimit-servlet-filter

Concurrent Limit Servlet Filter for a container like Tomcat
https://github.com/ggrandes/concurrentlimit-servlet-filter

concurrent filter http ip java limit request servlet tomcat

Last synced: 23 days ago
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Concurrent Limit Servlet Filter for a container like Tomcat

• Host: GitHub
• URL: https://github.com/ggrandes/concurrentlimit-servlet-filter
• Owner: ggrandes
• License: apache-2.0
• Created: 2017-10-29T21:09:30.000Z (over 8 years ago)
• Default Branch: main
• Last Pushed: 2025-08-27T17:57:41.000Z (5 months ago)
• Last Synced: 2025-08-28T02:22:43.120Z (5 months ago)
• Topics: concurrent, filter, http, ip, java, limit, request, servlet, tomcat
• Language: Java
• Homepage:
• Size: 10.7 KB
• Stars: 2
• Watchers: 0
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Concurrent Limit Servlet Filter

Provides concurrent control in a Servlet container like Tomcat. Open Source Java project under Apache License v2.0

### Current Development Version is [2.0.0](https://search.maven.org/#search|ga|1|g%3Aorg.javastack%20a%3Aconcurrentlimit-servlet-filter-jakarta)

---

## DOC

This filter works limiting access for specified URI.

1. Check if the IP has been seen in the last X milliseconds.

2. If not seen, try to acquire access (concurrent) for resource.

3. If any of this checks fail, HTTP code 429 (Too Many Requests) is returned to the client as described in [RFC-6585](http://tools.ietf.org/html/rfc6585#page-3).

#### Usage Example

```xml

    ConcurrentLimitFilter

    org.javastack.servlet.filters.ConcurrentLimitFilter

    

    

        /rest/update

        

        5:5000

    

    

    

        /rest/delete

        0:1000

    

    

    

        ipMaxSize

        4096

    

    ConcurrentLimitFilter

    /rest/*

```

---

## MAVEN

Add the dependency to your pom.xml:

###### jakarta.servlet (tomcat 10+)

    

        org.javastack

        concurrentlimit-servlet-filter-jakarta

        2.0.0

    

###### javax.servlet (tomcat 8.5, 9)

    

        org.javastack

        concurrentlimit-servlet-filter

        1.0.0

    

---

Inspired in [mod_ratelimit](https://httpd.apache.org/docs/2.4/es/mod/mod_ratelimit.html), this code is Java-minimalistic version.