---
title: jdk.net.url.delayParsing Java System Property
prop: jdk.net.url.delayParsing
description: The jdk.net.url.delayParsing java system property can delay parsing of java.net.URL until after connection is opened. 
layout: layout
date: Last Modified
nav: system
tags: networking
since: Java 20
example_value: false
---

<div class="jumbotron">
	<h1> Java System Property</h1>
	<div class="lead"></div>
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<h2>Default Value</h2>
<p><em>false</em> - by default the property is not set and will not delay parsing until after the connection is opened</p>
<h2>Overview of </h2>

<p>In versions prior to Java 20, the <code>java.net.URL</code> constructor would not fully parse the URL until after the <code>openConnection</code> or <code>connect</code> method was called. In Java 20 and above the default is to perform the parsing first which may throw a <code>MalformedURLException</code> upon an invalid URL value.</p>
<p>This system property was added to address backwards compatibility by setting it to <code>true</code>, however this may lead to a less secure environment. The idea is that a threat actor could pass a URL which is invalid but may still open a connection to a host of their choosing.</p>

<h2>Other Networking System Properties</h2>
<p>Here are some other networking Java system properties:</p>
<ul>
            <li><a href="/http.agent/"><code>http.agent</code></a></li>
        
            <li><a href="/http.keepalive/"><code>http.keepAlive</code></a></li>
        
            <li><a href="/http.maxconnections/"><code>http.maxConnections</code></a></li>
        
            <li><a href="/https.protocols/"><code>https.protocols</code></a></li>
        
            <li><a href="/java.net.preferipv4stack/"><code>java.net.preferIPv4Stack</code></a></li>
        
            <li><a href="/java.net.preferipv6addresses/"><code>java.net.preferIPv6Addresses</code></a></li>
        
            <li><a href="/java.net.usesystemproxies/"><code>java.net.useSystemProxies</code></a></li>
        
            <li><a href="/javax.net.debug/"><code>javax.net.debug</code></a></li>
        
            <li><a href="/javax.net.ssl.truststore/"><code>javax.net.ssl.trustStore</code></a></li>
        
            <li><a href="/jdk.net.hosts.file/"><code>jdk.net.hosts.file</code></a></li>
        
            <li><a href="/jdk.tls.client.protocols/"><code>jdk.tls.client.protocols</code></a></li>
        
            <li><a href="/security/jdk.tls.disabledalgorithms/"><code>jdk.tls.disabledAlgorithms</code></a></li>
        
            <li><a href="/security/networkaddress.cache.negative.ttl/"><code>networkaddress.cache.negative.ttl</code></a></li>
        
            <li><a href="/security/networkaddress.cache.ttl/"><code>networkaddress.cache.ttl</code></a></li>
        
            <li><a href="/sun.net.client.defaultconnecttimeout/"><code>sun.net.client.defaultConnectTimeout</code></a></li>
        
            <li><a href="/sun.net.client.defaultreadtimeout/"><code>sun.net.client.defaultReadTimeout</code></a></li>
        
            <li><a href="/sun.net.inetaddr.ttl/"><code>sun.net.inetaddr.ttl</code></a></li>
        </ul>