Java/0

Java HTTP client library

About this crawler

Java/0 is a web crawler identified by the regular-expression pattern Java\/[0-9] in the User-Agent request header. It is categorised as http-library. Use the regex above to detect, log, allow, or block Java/0 traffic in your web server, CDN edge rules, or robots.txt.

Block-rate · top 25k sites

No block-rate data for this crawler.

Technical details

Name: Java/0
Pattern: Java\/[0-9]
Tags: http-library
Added: 2026/05/09
Instances: 28 known sample(s)

Sample User-Agent strings

Java/1.4.1_04

Java/1.6.0

Java/1.6.0_04

Java/1.6.0_22

Java/1.6.0_24

Java/1.6.0_26

Java/1.6.0_31

Java/1.6.0_32

Java/1.6.0_34

Java/1.6.0_37

Java/1.7.0_101

Java/1.7.0_45

Java/1.7.0_51

Java/1.7.0_65

Java/1.7.0_80

Java/1.8.0_05

Java/1.8.0_20

Java/1.8.0_31

Java/1.8.0_40

Java/1.8.0_45

+ 8 more samples in crawlers.json

Block this crawler

robots.txt — disallow Java/0:

User-agent: Java/0 Disallow: /

Apache .htaccess — return 403:

RewriteEngine On RewriteCond %{HTTP_USER_AGENT} Java\/[0-9] [NC] RewriteRule .* - [F,L]

Nginx — return 403 inside a server block:

if ($http_user_agent ~* "Java\\/[0-9]") { return 403; }

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